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printk fixup for 5.16

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Merge tag 'printk-for-5.16-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk fixes from Petr Mladek:

 - Try to flush backtraces from other CPUs also on the local one. This
   was a regression caused by printk_safe buffers removal.

 - Remove header dependency warning.

* tag 'printk-for-5.16-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk: Remove printk.h inclusion in percpu.h
  printk: restore flushing of NMI buffers on remote CPUs after NMI backtraces
This commit is contained in:
Linus Torvalds 2021-11-18 10:50:45 -08:00
commit 7d5775d49e
5 changed files with 21 additions and 1 deletions
arch/powerpc/kernel
watchdog.c
include/linux
percpu.hprintk.h
kernel/printk
printk.c
lib
nmi_backtrace.c

6
arch/powerpc/kernel/watchdog.c
View file

@ -187,6 +187,12 @@ static void watchdog_smp_panic(int cpu, u64 tb)
if (sysctl_hardlockup_all_cpu_backtrace) if (sysctl_hardlockup_all_cpu_backtrace)
trigger_allbutself_cpu_backtrace(); trigger_allbutself_cpu_backtrace();
/*
* Force flush any remote buffers that might be stuck in IRQ context
* and therefore could not run their irq_work.
*/
printk_trigger_flush();
if (hardlockup_panic) if (hardlockup_panic)
nmi_panic(NULL, "Hard LOCKUP"); nmi_panic(NULL, "Hard LOCKUP");

1
include/linux/percpu.h
View file

@ -6,7 +6,6 @@
#include <linux/preempt.h> #include <linux/preempt.h>
#include <linux/smp.h> #include <linux/smp.h>
#include <linux/cpumask.h> #include <linux/cpumask.h>
#include <linux/printk.h>
#include <linux/pfn.h> #include <linux/pfn.h>
#include <linux/init.h> #include <linux/init.h>

4
include/linux/printk.h
View file

@ -198,6 +198,7 @@ void dump_stack_print_info(const char *log_lvl);
void show_regs_print_info(const char *log_lvl); void show_regs_print_info(const char *log_lvl);
extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold; extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold;
extern asmlinkage void dump_stack(void) __cold; extern asmlinkage void dump_stack(void) __cold;
void printk_trigger_flush(void);
#else #else
static inline __printf(1, 0) static inline __printf(1, 0)
int vprintk(const char *s, va_list args) int vprintk(const char *s, va_list args)
@ -274,6 +275,9 @@ static inline void dump_stack_lvl(const char *log_lvl)
static inline void dump_stack(void) static inline void dump_stack(void)
{ {
} }
static inline void printk_trigger_flush(void)
{
}
#endif #endif
#ifdef CONFIG_SMP #ifdef CONFIG_SMP

5
kernel/printk/printk.c
View file

@ -3253,6 +3253,11 @@ void defer_console_output(void)
preempt_enable(); preempt_enable();
} }
void printk_trigger_flush(void)
{
defer_console_output();
}
int vprintk_deferred(const char *fmt, va_list args) int vprintk_deferred(const char *fmt, va_list args)
{ {
int r; int r;

6
lib/nmi_backtrace.c
View file

@ -75,6 +75,12 @@ void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
touch_softlockup_watchdog(); touch_softlockup_watchdog();
} }
/*
* Force flush any remote buffers that might be stuck in IRQ context
* and therefore could not run their irq_work.
*/
printk_trigger_flush();
clear_bit_unlock(0, &backtrace_flag); clear_bit_unlock(0, &backtrace_flag);
put_cpu(); put_cpu();
} }