mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-31 14:23:49 +01:00
Jinchao Wang
d0d9c72355
Patch series "panic: introduce panic status function family", v2. This series introduces a family of helper functions to manage panic state and updates existing code to use them. Before this series, panic state helpers were scattered and inconsistent. For example, panic_in_progress() was defined in printk/printk.c, not in panic.c or panic.h. As a result, developers had to look in unexpected places to understand or re-use panic state logic. Other checks were open- coded, duplicating logic across panic, crash, and watchdog paths. The new helpers centralize the functionality in panic.c/panic.h: - panic_try_start() - panic_reset() - panic_in_progress() - panic_on_this_cpu() - panic_on_other_cpu() Patches 1–8 add the helpers and convert panic/crash and printk/nbcon code to use them. Patch 9 fixes a bug in the watchdog subsystem by skipping checks when a panic is in progress, avoiding interference with the panic CPU. Together, this makes panic state handling simpler, more discoverable, and more robust. This patch (of 9): This patch introduces four new helper functions to abstract the management of the panic_cpu variable. These functions will be used in subsequent patches to refactor existing code. The direct use of panic_cpu can be error-prone and ambiguous, as it requires manual checks to determine which CPU is handling the panic. The new helpers clarify intent: panic_try_start(): Atomically sets the current CPU as the panicking CPU. panic_reset(): Reset panic_cpu to PANIC_CPU_INVALID. panic_in_progress(): Checks if a panic has been triggered. panic_on_this_cpu(): Returns true if the current CPU is the panic originator. panic_on_other_cpu(): Returns true if a panic is on another CPU. This change lays the groundwork for improved code readability and robustness in the panic handling subsystem. Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Jinchao Wang <[email protected]> Cc: Anna Schumaker <[email protected]> Cc: Baoquan He <[email protected]> Cc: "Darrick J. Wong" <[email protected]> Cc: Dave Young <[email protected]> Cc: Doug Anderson <[email protected]> Cc: "Guilherme G. Piccoli" <[email protected]> Cc: Helge Deller <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jason Gunthorpe <[email protected]> Cc: Joanthan Cameron <[email protected]> Cc: Joel Granados <[email protected]> Cc: John Ogness <[email protected]> Cc: Kees Cook <[email protected]> Cc: Li Huafei <[email protected]> Cc: "Luck, Tony" <[email protected]> Cc: Luo Gengkun <[email protected]> Cc: Max Kellermann <[email protected]> Cc: Nam Cao <[email protected]> Cc: oushixiong <[email protected]> Cc: Petr Mladek <[email protected]> Cc: Qianqiang Liu <[email protected]> Cc: Sergey Senozhatsky <[email protected]> Cc: Sohil Mehta <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Thomas Gleinxer <[email protected]> Cc: Thomas Zimemrmann <[email protected]> Cc: Thorsten Blum <[email protected]> Cc: Ville Syrjala <[email protected]> Cc: Vivek Goyal <[email protected]> Cc: Yicong Yang <[email protected]> Cc: Yunhui Cui <[email protected]> Cc: Yury Norov (NVIDIA) <[email protected]>b Signed-off-by: Andrew Morton <[email protected]>
107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PANIC_H
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#define _LINUX_PANIC_H
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#include <linux/compiler_attributes.h>
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#include <linux/stdarg.h>
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#include <linux/types.h>
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struct pt_regs;
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extern long (*panic_blink)(int state);
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__printf(1, 2)
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void panic(const char *fmt, ...) __noreturn __cold;
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__printf(1, 0)
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void vpanic(const char *fmt, va_list args) __noreturn __cold;
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void nmi_panic(struct pt_regs *regs, const char *msg);
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void check_panic_on_warn(const char *origin);
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extern void oops_enter(void);
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extern void oops_exit(void);
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extern bool oops_may_print(void);
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extern bool panic_triggering_all_cpu_backtrace;
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extern int panic_timeout;
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extern unsigned long panic_print;
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extern int panic_on_oops;
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extern int panic_on_warn;
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extern unsigned long panic_on_taint;
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extern bool panic_on_taint_nousertaint;
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extern int sysctl_panic_on_stackoverflow;
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extern bool crash_kexec_post_notifiers;
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extern void __stack_chk_fail(void);
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void abort(void);
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/*
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* panic_cpu is used for synchronizing panic() and crash_kexec() execution. It
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* holds a CPU number which is executing panic() currently. A value of
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* PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec().
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*/
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extern atomic_t panic_cpu;
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#define PANIC_CPU_INVALID -1
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bool panic_try_start(void);
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void panic_reset(void);
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bool panic_in_progress(void);
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bool panic_on_this_cpu(void);
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bool panic_on_other_cpu(void);
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/*
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* Only to be used by arch init code. If the user over-wrote the default
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* CONFIG_PANIC_TIMEOUT, honor it.
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*/
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static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout)
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{
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if (panic_timeout == arch_default_timeout)
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panic_timeout = timeout;
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}
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/* This cannot be an enum because some may be used in assembly source. */
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#define TAINT_PROPRIETARY_MODULE 0
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#define TAINT_FORCED_MODULE 1
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#define TAINT_CPU_OUT_OF_SPEC 2
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#define TAINT_FORCED_RMMOD 3
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#define TAINT_MACHINE_CHECK 4
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#define TAINT_BAD_PAGE 5
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#define TAINT_USER 6
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#define TAINT_DIE 7
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#define TAINT_OVERRIDDEN_ACPI_TABLE 8
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#define TAINT_WARN 9
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#define TAINT_CRAP 10
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#define TAINT_FIRMWARE_WORKAROUND 11
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#define TAINT_OOT_MODULE 12
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#define TAINT_UNSIGNED_MODULE 13
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#define TAINT_SOFTLOCKUP 14
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#define TAINT_LIVEPATCH 15
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#define TAINT_AUX 16
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#define TAINT_RANDSTRUCT 17
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#define TAINT_TEST 18
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#define TAINT_FWCTL 19
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#define TAINT_FLAGS_COUNT 20
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#define TAINT_FLAGS_MAX ((1UL << TAINT_FLAGS_COUNT) - 1)
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struct taint_flag {
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char c_true; /* character printed when tainted */
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char c_false; /* character printed when not tainted */
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bool module; /* also show as a per-module taint flag */
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const char *desc; /* verbose description of the set taint flag */
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};
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extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT];
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enum lockdep_ok {
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LOCKDEP_STILL_OK,
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LOCKDEP_NOW_UNRELIABLE,
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};
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extern const char *print_tainted(void);
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extern const char *print_tainted_verbose(void);
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extern void add_taint(unsigned flag, enum lockdep_ok);
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extern int test_taint(unsigned flag);
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extern unsigned long get_taint(void);
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#endif /* _LINUX_PANIC_H */
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