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44e215352c
show_trace_log_lvl() provides x86 platform-specific way to unwind backtrace with a given log level. Unfortunately, registers dump(s) are not printed with the same log level - instead, KERN_DEFAULT is always used. Arista's switches uses quite common setup with rsyslog, where only urgent messages goes to console (console_log_level=KERN_ERR), everything else goes into /var/log/ as the console baud-rate often is indecently slow (9600 bps). Backtrace dumps without registers printed have proven to be as useful as morning standups. Furthermore, in order to introduce KERN_UNSUPPRESSED (which I believe is still the most elegant way to fix raciness of sysrq[1]) the log level should be passed down the stack to register dumping functions. Besides, there is a potential use-case for printing traces with KERN_DEBUG level [2] (where registers dump shouldn't appear with higher log level). Add log_lvl parameter to __show_regs(). Keep the used log level intact to separate visible change. [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/ [2]: https://lore.kernel.org/linux-doc/20190724170249.9644-1-dima@arista.com/ Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Petr Mladek <pmladek@suse.com> Link: https://lkml.kernel.org/r/20200629144847.492794-3-dima@arista.com
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_KDEBUG_H
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#define _ASM_X86_KDEBUG_H
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#include <linux/notifier.h>
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struct pt_regs;
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/* Grossly misnamed. */
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enum die_val {
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DIE_OOPS = 1,
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DIE_INT3,
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DIE_DEBUG,
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DIE_PANIC,
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DIE_NMI,
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DIE_DIE,
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DIE_KERNELDEBUG,
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DIE_TRAP,
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DIE_GPF,
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DIE_CALL,
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DIE_PAGE_FAULT,
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DIE_NMIUNKNOWN,
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};
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enum show_regs_mode {
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SHOW_REGS_SHORT,
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/*
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* For when userspace crashed, but we don't think it's our fault, and
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* therefore don't print kernel registers.
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*/
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SHOW_REGS_USER,
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SHOW_REGS_ALL
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};
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extern void die(const char *, struct pt_regs *,long);
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void die_addr(const char *str, struct pt_regs *regs, long err, long gp_addr);
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extern int __must_check __die(const char *, struct pt_regs *, long);
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extern void show_stack_regs(struct pt_regs *regs);
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extern void __show_regs(struct pt_regs *regs, enum show_regs_mode,
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const char *log_lvl);
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extern void show_iret_regs(struct pt_regs *regs, const char *log_lvl);
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extern unsigned long oops_begin(void);
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extern void oops_end(unsigned long, struct pt_regs *, int signr);
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#endif /* _ASM_X86_KDEBUG_H */
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