From f39650de687e35766572ac89dbcd16a5911e2f0a Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 30 Jun 2021 18:54:59 -0700 Subject: kernel.h: split out panic and oops helpers kernel.h is being used as a dump for all kinds of stuff for a long time. Here is the attempt to start cleaning it up by splitting out panic and oops helpers. There are several purposes of doing this: - dropping dependency in bug.h - dropping a loop by moving out panic_notifier.h - unload kernel.h from something which has its own domain At the same time convert users tree-wide to use new headers, although for the time being include new header back to kernel.h to avoid twisted indirected includes for existing users. [akpm@linux-foundation.org: thread_info.h needs limits.h] [andriy.shevchenko@linux.intel.com: ia64 fix] Link: https://lkml.kernel.org/r/20210520130557.55277-1-andriy.shevchenko@linux.intel.com Link: https://lkml.kernel.org/r/20210511074137.33666-1-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko Reviewed-by: Bjorn Andersson Co-developed-by: Andrew Morton Acked-by: Mike Rapoport Acked-by: Corey Minyard Acked-by: Christian Brauner Acked-by: Arnd Bergmann Acked-by: Kees Cook Acked-by: Wei Liu Acked-by: Rasmus Villemoes Signed-off-by: Andrew Morton Acked-by: Sebastian Reichel Acked-by: Luis Chamberlain Acked-by: Stephen Boyd Acked-by: Thomas Bogendoerfer Acked-by: Helge Deller # parisc Signed-off-by: Linus Torvalds --- include/linux/kernel.h | 84 +----------------------------------- include/linux/panic.h | 98 ++++++++++++++++++++++++++++++++++++++++++ include/linux/panic_notifier.h | 12 ++++++ include/linux/thread_info.h | 1 + 4 files changed, 112 insertions(+), 83 deletions(-) create mode 100644 include/linux/panic.h create mode 100644 include/linux/panic_notifier.h (limited to 'include/linux') diff --git a/include/linux/kernel.h b/include/linux/kernel.h index bf950621febf..baea2eb763d0 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -72,7 +73,6 @@ #define lower_32_bits(n) ((u32)((n) & 0xffffffff)) struct completion; -struct pt_regs; struct user; #ifdef CONFIG_PREEMPT_VOLUNTARY @@ -177,14 +177,6 @@ void __might_fault(const char *file, int line); static inline void might_fault(void) { } #endif -extern struct atomic_notifier_head panic_notifier_list; -extern long (*panic_blink)(int state); -__printf(1, 2) -void panic(const char *fmt, ...) __noreturn __cold; -void nmi_panic(struct pt_regs *regs, const char *msg); -extern void oops_enter(void); -extern void oops_exit(void); -extern bool oops_may_print(void); void do_exit(long error_code) __noreturn; void complete_and_exit(struct completion *, long) __noreturn; @@ -372,52 +364,8 @@ extern int __kernel_text_address(unsigned long addr); extern int kernel_text_address(unsigned long addr); extern int func_ptr_is_kernel_text(void *ptr); -#ifdef CONFIG_SMP -extern unsigned int sysctl_oops_all_cpu_backtrace; -#else -#define sysctl_oops_all_cpu_backtrace 0 -#endif /* CONFIG_SMP */ - extern void bust_spinlocks(int yes); -extern int panic_timeout; -extern unsigned long panic_print; -extern int panic_on_oops; -extern int panic_on_unrecovered_nmi; -extern int panic_on_io_nmi; -extern int panic_on_warn; -extern unsigned long panic_on_taint; -extern bool panic_on_taint_nousertaint; -extern int sysctl_panic_on_rcu_stall; -extern int sysctl_max_rcu_stall_to_panic; -extern int sysctl_panic_on_stackoverflow; - -extern bool crash_kexec_post_notifiers; -/* - * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It - * holds a CPU number which is executing panic() currently. A value of - * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec(). - */ -extern atomic_t panic_cpu; -#define PANIC_CPU_INVALID -1 - -/* - * Only to be used by arch init code. If the user over-wrote the default - * CONFIG_PANIC_TIMEOUT, honor it. - */ -static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout) -{ - if (panic_timeout == arch_default_timeout) - panic_timeout = timeout; -} -extern const char *print_tainted(void); -enum lockdep_ok { - LOCKDEP_STILL_OK, - LOCKDEP_NOW_UNRELIABLE -}; -extern void add_taint(unsigned flag, enum lockdep_ok); -extern int test_taint(unsigned flag); -extern unsigned long get_taint(void); extern int root_mountflags; extern bool early_boot_irqs_disabled; @@ -436,36 +384,6 @@ extern enum system_states { SYSTEM_SUSPEND, } system_state; -/* This cannot be an enum because some may be used in assembly source. */ -#define TAINT_PROPRIETARY_MODULE 0 -#define TAINT_FORCED_MODULE 1 -#define TAINT_CPU_OUT_OF_SPEC 2 -#define TAINT_FORCED_RMMOD 3 -#define TAINT_MACHINE_CHECK 4 -#define TAINT_BAD_PAGE 5 -#define TAINT_USER 6 -#define TAINT_DIE 7 -#define TAINT_OVERRIDDEN_ACPI_TABLE 8 -#define TAINT_WARN 9 -#define TAINT_CRAP 10 -#define TAINT_FIRMWARE_WORKAROUND 11 -#define TAINT_OOT_MODULE 12 -#define TAINT_UNSIGNED_MODULE 13 -#define TAINT_SOFTLOCKUP 14 -#define TAINT_LIVEPATCH 15 -#define TAINT_AUX 16 -#define TAINT_RANDSTRUCT 17 -#define TAINT_FLAGS_COUNT 18 -#define TAINT_FLAGS_MAX ((1UL << TAINT_FLAGS_COUNT) - 1) - -struct taint_flag { - char c_true; /* character printed when tainted */ - char c_false; /* character printed when not tainted */ - bool module; /* also show as a per-module taint flag */ -}; - -extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT]; - extern const char hex_asc[]; #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] diff --git a/include/linux/panic.h b/include/linux/panic.h new file mode 100644 index 000000000000..f5844908a089 --- /dev/null +++ b/include/linux/panic.h @@ -0,0 +1,98 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_PANIC_H +#define _LINUX_PANIC_H + +#include +#include + +struct pt_regs; + +extern long (*panic_blink)(int state); +__printf(1, 2) +void panic(const char *fmt, ...) __noreturn __cold; +void nmi_panic(struct pt_regs *regs, const char *msg); +extern void oops_enter(void); +extern void oops_exit(void); +extern bool oops_may_print(void); + +#ifdef CONFIG_SMP +extern unsigned int sysctl_oops_all_cpu_backtrace; +#else +#define sysctl_oops_all_cpu_backtrace 0 +#endif /* CONFIG_SMP */ + +extern int panic_timeout; +extern unsigned long panic_print; +extern int panic_on_oops; +extern int panic_on_unrecovered_nmi; +extern int panic_on_io_nmi; +extern int panic_on_warn; + +extern unsigned long panic_on_taint; +extern bool panic_on_taint_nousertaint; + +extern int sysctl_panic_on_rcu_stall; +extern int sysctl_max_rcu_stall_to_panic; +extern int sysctl_panic_on_stackoverflow; + +extern bool crash_kexec_post_notifiers; + +/* + * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It + * holds a CPU number which is executing panic() currently. A value of + * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec(). + */ +extern atomic_t panic_cpu; +#define PANIC_CPU_INVALID -1 + +/* + * Only to be used by arch init code. If the user over-wrote the default + * CONFIG_PANIC_TIMEOUT, honor it. + */ +static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout) +{ + if (panic_timeout == arch_default_timeout) + panic_timeout = timeout; +} + +/* This cannot be an enum because some may be used in assembly source. */ +#define TAINT_PROPRIETARY_MODULE 0 +#define TAINT_FORCED_MODULE 1 +#define TAINT_CPU_OUT_OF_SPEC 2 +#define TAINT_FORCED_RMMOD 3 +#define TAINT_MACHINE_CHECK 4 +#define TAINT_BAD_PAGE 5 +#define TAINT_USER 6 +#define TAINT_DIE 7 +#define TAINT_OVERRIDDEN_ACPI_TABLE 8 +#define TAINT_WARN 9 +#define TAINT_CRAP 10 +#define TAINT_FIRMWARE_WORKAROUND 11 +#define TAINT_OOT_MODULE 12 +#define TAINT_UNSIGNED_MODULE 13 +#define TAINT_SOFTLOCKUP 14 +#define TAINT_LIVEPATCH 15 +#define TAINT_AUX 16 +#define TAINT_RANDSTRUCT 17 +#define TAINT_FLAGS_COUNT 18 +#define TAINT_FLAGS_MAX ((1UL << TAINT_FLAGS_COUNT) - 1) + +struct taint_flag { + char c_true; /* character printed when tainted */ + char c_false; /* character printed when not tainted */ + bool module; /* also show as a per-module taint flag */ +}; + +extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT]; + +enum lockdep_ok { + LOCKDEP_STILL_OK, + LOCKDEP_NOW_UNRELIABLE, +}; + +extern const char *print_tainted(void); +extern void add_taint(unsigned flag, enum lockdep_ok); +extern int test_taint(unsigned flag); +extern unsigned long get_taint(void); + +#endif /* _LINUX_PANIC_H */ diff --git a/include/linux/panic_notifier.h b/include/linux/panic_notifier.h new file mode 100644 index 000000000000..41e32483d7a7 --- /dev/null +++ b/include/linux/panic_notifier.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_PANIC_NOTIFIERS_H +#define _LINUX_PANIC_NOTIFIERS_H + +#include +#include + +extern struct atomic_notifier_head panic_notifier_list; + +extern bool crash_kexec_post_notifiers; + +#endif /* _LINUX_PANIC_NOTIFIERS_H */ diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h index 157762db9d4b..0999f6317978 100644 --- a/include/linux/thread_info.h +++ b/include/linux/thread_info.h @@ -9,6 +9,7 @@ #define _LINUX_THREAD_INFO_H #include +#include #include #include #include -- cgit