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nmi: Export CPU backtrace APIs for loadable modules

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Currently, CPU backtrace functions cannot be called from loadable
modules because the underlying helper arch_trigger_cpumask_backtrace()
is not exported.

Instead of exporting arch_trigger_cpumask_backtrace() individually
across every supported architecture, introduce and export a common
helper, cpumask_backtrace(), in lib/nmi_backtrace.c. Update the four
inline CPU backtrace macros in include/linux/nmi.h to route through this
centralized helper.

Signed-off-by: Mayank Rungta <mrungta@google.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20260730-export-cpu-backtrace-apis-v1-1-bace8e1cb817@google.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Mayank Rungta
2026-07-30 15:00:21 -07:00
committed by Guenter Roeck
parent b583ce8541
commit bd26ae0caa
2 changed files with 13 additions and 4 deletions
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10
include/linux/nmi.h
View File

@@ -157,27 +157,29 @@ static inline void touch_nmi_watchdog(void)
* to allow calling code to fall back to some other mechanism:
*/
#ifdef arch_trigger_cpumask_backtrace
void cpumask_backtrace(const cpumask_t *mask, int exclude_cpu);
static inline bool trigger_all_cpu_backtrace(void)
{
arch_trigger_cpumask_backtrace(cpu_online_mask, -1);
cpumask_backtrace(cpu_online_mask, -1);
return true;
}
static inline bool trigger_allbutcpu_cpu_backtrace(int exclude_cpu)
{
arch_trigger_cpumask_backtrace(cpu_online_mask, exclude_cpu);
cpumask_backtrace(cpu_online_mask, exclude_cpu);
return true;
}
static inline bool trigger_cpumask_backtrace(struct cpumask *mask)
{
arch_trigger_cpumask_backtrace(mask, -1);
cpumask_backtrace(mask, -1);
return true;
}
static inline bool trigger_single_cpu_backtrace(int cpu)
{
arch_trigger_cpumask_backtrace(cpumask_of(cpu), -1);
cpumask_backtrace(cpumask_of(cpu), -1);
return true;
}

7
lib/nmi_backtrace.c
View File

@@ -19,6 +19,7 @@
#include <linux/stringify.h>
#include <linux/nmi.h>
#include <linux/cpu.h>
#include <linux/export.h>
#include <linux/sched/debug.h>
#ifdef arch_trigger_cpumask_backtrace
@@ -129,4 +130,10 @@ bool nmi_cpu_backtrace(struct pt_regs *regs)
return false;
}
NOKPROBE_SYMBOL(nmi_cpu_backtrace);
void cpumask_backtrace(const cpumask_t *mask, int exclude_cpu)
{
arch_trigger_cpumask_backtrace(mask, exclude_cpu);
}
EXPORT_SYMBOL_GPL(cpumask_backtrace);
#endif