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![Herbert Xu](/assets/img/avatar_default.png)
As it stands if you include printk.h by itself it will fail to compile because it requires definitions from ratelimit.h. However, simply including ratelimit.h from printk.h does not work due to inclusion loops involving sched.h and kernel.h. This patch solves this by moving bits from ratelimit.h into a new header file which can then be included by printk.h without any worries about header loops. The build bot then revealed some intriguing failures arising out of this patch. On s390 there is an inclusion loop with asm/bug.h and linux/kernel.h that triggers a compile failure, because kernel.h will cause asm-generic/bug.h to be included before s390's own asm/bug.h has finished processing. This has been fixed by not including kernel.h in arch/s390/include/asm/bug.h. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Petr Mladek <pmladek@suse.com> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Link: https://lore.kernel.org/r/20200721062248.GA18383@gondor.apana.org.au
622 lines
18 KiB
C
622 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KERNEL_PRINTK__
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#define __KERNEL_PRINTK__
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#include <stdarg.h>
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#include <linux/init.h>
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#include <linux/kern_levels.h>
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#include <linux/linkage.h>
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#include <linux/cache.h>
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#include <linux/ratelimit_types.h>
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extern const char linux_banner[];
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extern const char linux_proc_banner[];
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#define PRINTK_MAX_SINGLE_HEADER_LEN 2
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static inline int printk_get_level(const char *buffer)
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{
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if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
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switch (buffer[1]) {
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case '0' ... '7':
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case 'c': /* KERN_CONT */
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return buffer[1];
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}
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}
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return 0;
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}
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static inline const char *printk_skip_level(const char *buffer)
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{
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if (printk_get_level(buffer))
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return buffer + 2;
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return buffer;
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}
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static inline const char *printk_skip_headers(const char *buffer)
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{
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while (printk_get_level(buffer))
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buffer = printk_skip_level(buffer);
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return buffer;
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}
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#define CONSOLE_EXT_LOG_MAX 8192
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/* printk's without a loglevel use this.. */
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#define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
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/* We show everything that is MORE important than this.. */
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#define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */
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#define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */
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#define CONSOLE_LOGLEVEL_DEBUG 10 /* issue debug messages */
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#define CONSOLE_LOGLEVEL_MOTORMOUTH 15 /* You can't shut this one up */
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/*
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* Default used to be hard-coded at 7, quiet used to be hardcoded at 4,
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* we're now allowing both to be set from kernel config.
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*/
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#define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
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#define CONSOLE_LOGLEVEL_QUIET CONFIG_CONSOLE_LOGLEVEL_QUIET
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extern int console_printk[];
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#define console_loglevel (console_printk[0])
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#define default_message_loglevel (console_printk[1])
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#define minimum_console_loglevel (console_printk[2])
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#define default_console_loglevel (console_printk[3])
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static inline void console_silent(void)
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{
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console_loglevel = CONSOLE_LOGLEVEL_SILENT;
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}
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static inline void console_verbose(void)
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{
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if (console_loglevel)
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console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
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}
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/* strlen("ratelimit") + 1 */
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#define DEVKMSG_STR_MAX_SIZE 10
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extern char devkmsg_log_str[];
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struct ctl_table;
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extern int suppress_printk;
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struct va_format {
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const char *fmt;
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va_list *va;
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};
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/*
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* FW_BUG
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* Add this to a message where you are sure the firmware is buggy or behaves
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* really stupid or out of spec. Be aware that the responsible BIOS developer
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* should be able to fix this issue or at least get a concrete idea of the
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* problem by reading your message without the need of looking at the kernel
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* code.
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*
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* Use it for definite and high priority BIOS bugs.
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*
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* FW_WARN
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* Use it for not that clear (e.g. could the kernel messed up things already?)
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* and medium priority BIOS bugs.
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*
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* FW_INFO
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* Use this one if you want to tell the user or vendor about something
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* suspicious, but generally harmless related to the firmware.
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*
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* Use it for information or very low priority BIOS bugs.
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*/
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#define FW_BUG "[Firmware Bug]: "
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#define FW_WARN "[Firmware Warn]: "
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#define FW_INFO "[Firmware Info]: "
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/*
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* HW_ERR
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* Add this to a message for hardware errors, so that user can report
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* it to hardware vendor instead of LKML or software vendor.
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*/
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#define HW_ERR "[Hardware Error]: "
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/*
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* DEPRECATED
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* Add this to a message whenever you want to warn user space about the use
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* of a deprecated aspect of an API so they can stop using it
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*/
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#define DEPRECATED "[Deprecated]: "
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/*
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* Dummy printk for disabled debugging statements to use whilst maintaining
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* gcc's format checking.
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*/
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#define no_printk(fmt, ...) \
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({ \
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if (0) \
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printk(fmt, ##__VA_ARGS__); \
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0; \
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})
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#ifdef CONFIG_EARLY_PRINTK
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extern asmlinkage __printf(1, 2)
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void early_printk(const char *fmt, ...);
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#else
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static inline __printf(1, 2) __cold
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void early_printk(const char *s, ...) { }
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#endif
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#ifdef CONFIG_PRINTK_NMI
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extern void printk_nmi_enter(void);
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extern void printk_nmi_exit(void);
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extern void printk_nmi_direct_enter(void);
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extern void printk_nmi_direct_exit(void);
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#else
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static inline void printk_nmi_enter(void) { }
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static inline void printk_nmi_exit(void) { }
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static inline void printk_nmi_direct_enter(void) { }
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static inline void printk_nmi_direct_exit(void) { }
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#endif /* PRINTK_NMI */
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#ifdef CONFIG_PRINTK
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asmlinkage __printf(5, 0)
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int vprintk_emit(int facility, int level,
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const char *dict, size_t dictlen,
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const char *fmt, va_list args);
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asmlinkage __printf(1, 0)
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int vprintk(const char *fmt, va_list args);
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asmlinkage __printf(1, 2) __cold
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int printk(const char *fmt, ...);
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/*
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* Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
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*/
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__printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
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/*
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* Please don't use printk_ratelimit(), because it shares ratelimiting state
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* with all other unrelated printk_ratelimit() callsites. Instead use
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* printk_ratelimited() or plain old __ratelimit().
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*/
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extern int __printk_ratelimit(const char *func);
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#define printk_ratelimit() __printk_ratelimit(__func__)
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extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
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unsigned int interval_msec);
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extern int printk_delay_msec;
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extern int dmesg_restrict;
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extern int
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devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void *buf,
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size_t *lenp, loff_t *ppos);
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extern void wake_up_klogd(void);
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char *log_buf_addr_get(void);
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u32 log_buf_len_get(void);
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void log_buf_vmcoreinfo_setup(void);
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void __init setup_log_buf(int early);
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__printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
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void dump_stack_print_info(const char *log_lvl);
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void show_regs_print_info(const char *log_lvl);
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extern asmlinkage void dump_stack(void) __cold;
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extern void printk_safe_flush(void);
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extern void printk_safe_flush_on_panic(void);
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#else
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static inline __printf(1, 0)
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int vprintk(const char *s, va_list args)
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{
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return 0;
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}
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static inline __printf(1, 2) __cold
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int printk(const char *s, ...)
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{
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return 0;
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}
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static inline __printf(1, 2) __cold
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int printk_deferred(const char *s, ...)
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{
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return 0;
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}
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static inline int printk_ratelimit(void)
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{
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return 0;
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}
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static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
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unsigned int interval_msec)
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{
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return false;
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}
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static inline void wake_up_klogd(void)
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{
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}
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static inline char *log_buf_addr_get(void)
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{
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return NULL;
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}
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static inline u32 log_buf_len_get(void)
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{
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return 0;
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}
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static inline void log_buf_vmcoreinfo_setup(void)
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{
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}
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static inline void setup_log_buf(int early)
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{
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}
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static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
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{
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}
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static inline void dump_stack_print_info(const char *log_lvl)
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{
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}
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static inline void show_regs_print_info(const char *log_lvl)
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{
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}
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static inline void dump_stack(void)
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{
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}
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static inline void printk_safe_flush(void)
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{
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}
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static inline void printk_safe_flush_on_panic(void)
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{
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}
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#endif
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extern int kptr_restrict;
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/**
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* pr_fmt - used by the pr_*() macros to generate the printk format string
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* @fmt: format string passed from a pr_*() macro
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*
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* This macro can be used to generate a unified format string for pr_*()
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* macros. A common use is to prefix all pr_*() messages in a file with a common
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* string. For example, defining this at the top of a source file:
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*
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* #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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*
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* would prefix all pr_info, pr_emerg... messages in the file with the module
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* name.
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*/
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#ifndef pr_fmt
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#define pr_fmt(fmt) fmt
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#endif
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/**
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* pr_emerg - Print an emergency-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_EMERG loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_emerg(fmt, ...) \
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printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_alert - Print an alert-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_ALERT loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_alert(fmt, ...) \
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printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_crit - Print a critical-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_CRIT loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_crit(fmt, ...) \
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printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_err - Print an error-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_ERR loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_err(fmt, ...) \
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printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_warn - Print a warning-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_WARNING loglevel. It uses pr_fmt()
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* to generate the format string.
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*/
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#define pr_warn(fmt, ...) \
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printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_notice - Print a notice-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_NOTICE loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_notice(fmt, ...) \
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printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_info - Print an info-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_INFO loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_info(fmt, ...) \
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printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_cont - Continues a previous log message in the same line.
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_CONT loglevel. It should only be
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* used when continuing a log message with no newline ('\n') enclosed. Otherwise
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* it defaults back to KERN_DEFAULT loglevel.
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*/
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#define pr_cont(fmt, ...) \
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printk(KERN_CONT fmt, ##__VA_ARGS__)
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/**
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* pr_devel - Print a debug-level message conditionally
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_DEBUG loglevel if DEBUG is
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* defined. Otherwise it does nothing.
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*
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* It uses pr_fmt() to generate the format string.
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*/
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#ifdef DEBUG
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#define pr_devel(fmt, ...) \
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printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_devel(fmt, ...) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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/* If you are writing a driver, please use dev_dbg instead */
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#if defined(CONFIG_DYNAMIC_DEBUG) || \
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(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
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#include <linux/dynamic_debug.h>
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/**
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* pr_debug - Print a debug-level message conditionally
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to dynamic_pr_debug() if CONFIG_DYNAMIC_DEBUG is
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* set. Otherwise, if DEBUG is defined, it's equivalent to a printk with
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* KERN_DEBUG loglevel. If DEBUG is not defined it does nothing.
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*
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* It uses pr_fmt() to generate the format string (dynamic_pr_debug() uses
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* pr_fmt() internally).
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*/
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#define pr_debug(fmt, ...) \
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dynamic_pr_debug(fmt, ##__VA_ARGS__)
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#elif defined(DEBUG)
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#define pr_debug(fmt, ...) \
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printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_debug(fmt, ...) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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/*
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* Print a one-time message (analogous to WARN_ONCE() et al):
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*/
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#ifdef CONFIG_PRINTK
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#define printk_once(fmt, ...) \
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({ \
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static bool __section(.data.once) __print_once; \
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bool __ret_print_once = !__print_once; \
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\
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if (!__print_once) { \
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__print_once = true; \
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printk(fmt, ##__VA_ARGS__); \
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} \
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unlikely(__ret_print_once); \
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})
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#define printk_deferred_once(fmt, ...) \
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({ \
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static bool __section(.data.once) __print_once; \
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bool __ret_print_once = !__print_once; \
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\
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if (!__print_once) { \
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__print_once = true; \
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printk_deferred(fmt, ##__VA_ARGS__); \
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} \
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unlikely(__ret_print_once); \
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})
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#else
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#define printk_once(fmt, ...) \
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no_printk(fmt, ##__VA_ARGS__)
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#define printk_deferred_once(fmt, ...) \
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no_printk(fmt, ##__VA_ARGS__)
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#endif
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#define pr_emerg_once(fmt, ...) \
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printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_alert_once(fmt, ...) \
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printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_crit_once(fmt, ...) \
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printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_err_once(fmt, ...) \
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printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_warn_once(fmt, ...) \
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printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_notice_once(fmt, ...) \
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printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_info_once(fmt, ...) \
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printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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/* no pr_cont_once, don't do that... */
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#if defined(DEBUG)
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#define pr_devel_once(fmt, ...) \
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printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_devel_once(fmt, ...) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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/* If you are writing a driver, please use dev_dbg instead */
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#if defined(DEBUG)
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#define pr_debug_once(fmt, ...) \
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printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#else
|
|
#define pr_debug_once(fmt, ...) \
|
|
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#endif
|
|
|
|
/*
|
|
* ratelimited messages with local ratelimit_state,
|
|
* no local ratelimit_state used in the !PRINTK case
|
|
*/
|
|
#ifdef CONFIG_PRINTK
|
|
#define printk_ratelimited(fmt, ...) \
|
|
({ \
|
|
static DEFINE_RATELIMIT_STATE(_rs, \
|
|
DEFAULT_RATELIMIT_INTERVAL, \
|
|
DEFAULT_RATELIMIT_BURST); \
|
|
\
|
|
if (__ratelimit(&_rs)) \
|
|
printk(fmt, ##__VA_ARGS__); \
|
|
})
|
|
#else
|
|
#define printk_ratelimited(fmt, ...) \
|
|
no_printk(fmt, ##__VA_ARGS__)
|
|
#endif
|
|
|
|
#define pr_emerg_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_alert_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_crit_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_err_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_warn_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_notice_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_info_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
|
|
/* no pr_cont_ratelimited, don't do that... */
|
|
|
|
#if defined(DEBUG)
|
|
#define pr_devel_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#else
|
|
#define pr_devel_ratelimited(fmt, ...) \
|
|
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#endif
|
|
|
|
/* If you are writing a driver, please use dev_dbg instead */
|
|
#if defined(CONFIG_DYNAMIC_DEBUG) || \
|
|
(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
|
|
/* descriptor check is first to prevent flooding with "callbacks suppressed" */
|
|
#define pr_debug_ratelimited(fmt, ...) \
|
|
do { \
|
|
static DEFINE_RATELIMIT_STATE(_rs, \
|
|
DEFAULT_RATELIMIT_INTERVAL, \
|
|
DEFAULT_RATELIMIT_BURST); \
|
|
DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
|
|
if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
|
|
__ratelimit(&_rs)) \
|
|
__dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
|
|
} while (0)
|
|
#elif defined(DEBUG)
|
|
#define pr_debug_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#else
|
|
#define pr_debug_ratelimited(fmt, ...) \
|
|
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#endif
|
|
|
|
extern const struct file_operations kmsg_fops;
|
|
|
|
enum {
|
|
DUMP_PREFIX_NONE,
|
|
DUMP_PREFIX_ADDRESS,
|
|
DUMP_PREFIX_OFFSET
|
|
};
|
|
extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
|
|
int groupsize, char *linebuf, size_t linebuflen,
|
|
bool ascii);
|
|
#ifdef CONFIG_PRINTK
|
|
extern void print_hex_dump(const char *level, const char *prefix_str,
|
|
int prefix_type, int rowsize, int groupsize,
|
|
const void *buf, size_t len, bool ascii);
|
|
#else
|
|
static inline void print_hex_dump(const char *level, const char *prefix_str,
|
|
int prefix_type, int rowsize, int groupsize,
|
|
const void *buf, size_t len, bool ascii)
|
|
{
|
|
}
|
|
static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
|
|
const void *buf, size_t len)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
#if defined(CONFIG_DYNAMIC_DEBUG) || \
|
|
(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
|
|
#define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
|
|
groupsize, buf, len, ascii) \
|
|
dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
|
|
groupsize, buf, len, ascii)
|
|
#elif defined(DEBUG)
|
|
#define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
|
|
groupsize, buf, len, ascii) \
|
|
print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
|
|
groupsize, buf, len, ascii)
|
|
#else
|
|
static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
|
|
int rowsize, int groupsize,
|
|
const void *buf, size_t len, bool ascii)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
|
|
* @prefix_str: string to prefix each line with;
|
|
* caller supplies trailing spaces for alignment if desired
|
|
* @prefix_type: controls whether prefix of an offset, address, or none
|
|
* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
|
|
* @buf: data blob to dump
|
|
* @len: number of bytes in the @buf
|
|
*
|
|
* Calls print_hex_dump(), with log level of KERN_DEBUG,
|
|
* rowsize of 16, groupsize of 1, and ASCII output included.
|
|
*/
|
|
#define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
|
|
print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)
|
|
|
|
#endif
|