Since kprobes depends on preempt disable/enable, probing on the preempt debug routine can cause recursive breakpoint problem.
Signed-off-by: Masami Hiramatsu mhiramat@kernel.org --- lib/smp_processor_id.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c index 85925aaa4fff..157d9e31f6c2 100644 --- a/lib/smp_processor_id.c +++ b/lib/smp_processor_id.c @@ -5,10 +5,11 @@ * DEBUG_PREEMPT variant of smp_processor_id(). */ #include <linux/export.h> +#include <linux/kprobes.h> #include <linux/sched.h>
-notrace static unsigned int check_preemption_disabled(const char *what1, - const char *what2) +notrace static nokprobe_inline +unsigned int check_preemption_disabled(const char *what1, const char *what2) { int this_cpu = raw_smp_processor_id();
@@ -56,9 +57,11 @@ notrace unsigned int debug_smp_processor_id(void) return check_preemption_disabled("smp_processor_id", ""); } EXPORT_SYMBOL(debug_smp_processor_id); +NOKPROBE_SYMBOL(debug_smp_processor_id);
notrace void __this_cpu_preempt_check(const char *op) { check_preemption_disabled("__this_cpu_", op); } EXPORT_SYMBOL(__this_cpu_preempt_check); +NOKPROBE_SYMBOL(__this_cpu_preempt_check);