mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
b1fca27d38
I like _ONCE warnings because it's guaranteed that they don't flood the log. During testing I find it useful to reset the state of the once warnings, so that I can rerun tests and see if they trigger again, or can guarantee that a test run always hits the same warnings. This patch adds a debugfs interface to reset all the _ONCE warnings so that they appear again: echo 1 > /sys/kernel/debug/clear_warn_once This is implemented by putting all the warning booleans into a special section, and clearing it. [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/20171017221455.6740-1-andi@firstfloor.org Signed-off-by: Andi Kleen <ak@linux.intel.com> Tested-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
238 lines
6.4 KiB
C
238 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_GENERIC_BUG_H
|
|
#define _ASM_GENERIC_BUG_H
|
|
|
|
#include <linux/compiler.h>
|
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
|
#define BUGFLAG_WARNING (1 << 0)
|
|
#define BUGFLAG_ONCE (1 << 1)
|
|
#define BUGFLAG_DONE (1 << 2)
|
|
#define BUGFLAG_TAINT(taint) ((taint) << 8)
|
|
#define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
|
|
#endif
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/kernel.h>
|
|
|
|
#ifdef CONFIG_BUG
|
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
|
struct bug_entry {
|
|
#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
|
|
unsigned long bug_addr;
|
|
#else
|
|
signed int bug_addr_disp;
|
|
#endif
|
|
#ifdef CONFIG_DEBUG_BUGVERBOSE
|
|
#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
|
|
const char *file;
|
|
#else
|
|
signed int file_disp;
|
|
#endif
|
|
unsigned short line;
|
|
#endif
|
|
unsigned short flags;
|
|
};
|
|
#endif /* CONFIG_GENERIC_BUG */
|
|
|
|
/*
|
|
* Don't use BUG() or BUG_ON() unless there's really no way out; one
|
|
* example might be detecting data structure corruption in the middle
|
|
* of an operation that can't be backed out of. If the (sub)system
|
|
* can somehow continue operating, perhaps with reduced functionality,
|
|
* it's probably not BUG-worthy.
|
|
*
|
|
* If you're tempted to BUG(), think again: is completely giving up
|
|
* really the *only* solution? There are usually better options, where
|
|
* users don't need to reboot ASAP and can mostly shut down cleanly.
|
|
*/
|
|
#ifndef HAVE_ARCH_BUG
|
|
#define BUG() do { \
|
|
printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
|
|
panic("BUG!"); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_BUG_ON
|
|
#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
|
|
#endif
|
|
|
|
#ifdef __WARN_FLAGS
|
|
#define __WARN_TAINT(taint) __WARN_FLAGS(BUGFLAG_TAINT(taint))
|
|
#define __WARN_ONCE_TAINT(taint) __WARN_FLAGS(BUGFLAG_ONCE|BUGFLAG_TAINT(taint))
|
|
|
|
#define WARN_ON_ONCE(condition) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
if (unlikely(__ret_warn_on)) \
|
|
__WARN_ONCE_TAINT(TAINT_WARN); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
/*
|
|
* WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
|
|
* significant issues that need prompt attention if they should ever
|
|
* appear at runtime. Use the versions with printk format strings
|
|
* to provide better diagnostics.
|
|
*/
|
|
#ifndef __WARN_TAINT
|
|
extern __printf(3, 4)
|
|
void warn_slowpath_fmt(const char *file, const int line,
|
|
const char *fmt, ...);
|
|
extern __printf(4, 5)
|
|
void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint,
|
|
const char *fmt, ...);
|
|
extern void warn_slowpath_null(const char *file, const int line);
|
|
#define WANT_WARN_ON_SLOWPATH
|
|
#define __WARN() warn_slowpath_null(__FILE__, __LINE__)
|
|
#define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
|
|
#define __WARN_printf_taint(taint, arg...) \
|
|
warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
|
|
#else
|
|
#define __WARN() __WARN_TAINT(TAINT_WARN)
|
|
#define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
|
|
#define __WARN_printf_taint(taint, arg...) \
|
|
do { printk(arg); __WARN_TAINT(taint); } while (0)
|
|
#endif
|
|
|
|
/* used internally by panic.c */
|
|
struct warn_args;
|
|
struct pt_regs;
|
|
|
|
void __warn(const char *file, int line, void *caller, unsigned taint,
|
|
struct pt_regs *regs, struct warn_args *args);
|
|
|
|
#ifndef WARN_ON
|
|
#define WARN_ON(condition) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
if (unlikely(__ret_warn_on)) \
|
|
__WARN(); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
#ifndef WARN
|
|
#define WARN(condition, format...) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
if (unlikely(__ret_warn_on)) \
|
|
__WARN_printf(format); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
#define WARN_TAINT(condition, taint, format...) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
if (unlikely(__ret_warn_on)) \
|
|
__WARN_printf_taint(taint, format); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
|
|
#ifndef WARN_ON_ONCE
|
|
#define WARN_ON_ONCE(condition) ({ \
|
|
static bool __section(.data.once) __warned; \
|
|
int __ret_warn_once = !!(condition); \
|
|
\
|
|
if (unlikely(__ret_warn_once && !__warned)) { \
|
|
__warned = true; \
|
|
WARN_ON(1); \
|
|
} \
|
|
unlikely(__ret_warn_once); \
|
|
})
|
|
#endif
|
|
|
|
#define WARN_ONCE(condition, format...) ({ \
|
|
static bool __section(.data.once) __warned; \
|
|
int __ret_warn_once = !!(condition); \
|
|
\
|
|
if (unlikely(__ret_warn_once && !__warned)) { \
|
|
__warned = true; \
|
|
WARN(1, format); \
|
|
} \
|
|
unlikely(__ret_warn_once); \
|
|
})
|
|
|
|
#define WARN_TAINT_ONCE(condition, taint, format...) ({ \
|
|
static bool __section(.data.once) __warned; \
|
|
int __ret_warn_once = !!(condition); \
|
|
\
|
|
if (unlikely(__ret_warn_once && !__warned)) { \
|
|
__warned = true; \
|
|
WARN_TAINT(1, taint, format); \
|
|
} \
|
|
unlikely(__ret_warn_once); \
|
|
})
|
|
|
|
#else /* !CONFIG_BUG */
|
|
#ifndef HAVE_ARCH_BUG
|
|
#define BUG() do {} while (1)
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_BUG_ON
|
|
#define BUG_ON(condition) do { if (condition) BUG(); } while (0)
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_WARN_ON
|
|
#define WARN_ON(condition) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
#ifndef WARN
|
|
#define WARN(condition, format...) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
no_printk(format); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
#define WARN_ON_ONCE(condition) WARN_ON(condition)
|
|
#define WARN_ONCE(condition, format...) WARN(condition, format)
|
|
#define WARN_TAINT(condition, taint, format...) WARN(condition, format)
|
|
#define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* WARN_ON_SMP() is for cases that the warning is either
|
|
* meaningless for !SMP or may even cause failures.
|
|
* This is usually used for cases that we have
|
|
* WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
|
|
* returns 0 for uniprocessor settings.
|
|
* It can also be used with values that are only defined
|
|
* on SMP:
|
|
*
|
|
* struct foo {
|
|
* [...]
|
|
* #ifdef CONFIG_SMP
|
|
* int bar;
|
|
* #endif
|
|
* };
|
|
*
|
|
* void func(struct foo *zoot)
|
|
* {
|
|
* WARN_ON_SMP(!zoot->bar);
|
|
*
|
|
* For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(),
|
|
* and should be a nop and return false for uniprocessor.
|
|
*
|
|
* if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set
|
|
* and x is true.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
# define WARN_ON_SMP(x) WARN_ON(x)
|
|
#else
|
|
/*
|
|
* Use of ({0;}) because WARN_ON_SMP(x) may be used either as
|
|
* a stand alone line statement or as a condition in an if ()
|
|
* statement.
|
|
* A simple "0" would cause gcc to give a "statement has no effect"
|
|
* warning.
|
|
*/
|
|
# define WARN_ON_SMP(x) ({0;})
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif
|