From: John Keeping john@metanate.com
commit ea65b41807a26495ff2a73dd8b1bab2751940887 upstream.
If the compiler decides not to inline this function then preemption tracing will always show an IP inside the preemption disabling path and never the function actually calling preempt_{enable,disable}.
Link: https://lore.kernel.org/linux-trace-kernel/20230327173647.1690849-1-john@met...
Cc: Masami Hiramatsu mhiramat@kernel.org Cc: Mark Rutland mark.rutland@arm.com Cc: stable@vger.kernel.org Fixes: f904f58263e1d ("sched/debug: Fix preempt_disable_ip recording for preempt_disable()") Signed-off-by: John Keeping john@metanate.com Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/ftrace.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -970,7 +970,7 @@ static inline void __ftrace_enabled_rest #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5)) #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
-static inline unsigned long get_lock_parent_ip(void) +static __always_inline unsigned long get_lock_parent_ip(void) { unsigned long addr = CALLER_ADDR0;