From: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx> Subject: kernel/extable.c: mark core_kernel_text notrace core_kernel_text is used by MIPS in its function graph trace processing, so having this method traced leads to an infinite set of recursive calls such as: [ 2.972075] Call Trace: [ 2.972111] [ 2.976731] [<80506584>] ftrace_return_to_handler+0x50/0x128 [ 2.983379] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 2.989146] [<804119b8>] prepare_ftrace_return+0x6c/0x114 [ 2.995402] [<80411b2c>] ftrace_graph_caller+0x20/0x44 [ 3.001362] [<80411b60>] return_to_handler+0x10/0x30 [ 3.007159] [<80411b50>] return_to_handler+0x0/0x30 [ 3.012827] [<80411b50>] return_to_handler+0x0/0x30 [ 3.018621] [<804e589c>] ftrace_ops_no_ops+0x114/0x1bc [ 3.024602] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 3.030377] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 3.036140] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 3.041915] [<804e589c>] ftrace_ops_no_ops+0x114/0x1bc [ 3.047923] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 3.053682] [<804119b8>] prepare_ftrace_return+0x6c/0x114 [ 3.059938] [<80411b2c>] ftrace_graph_caller+0x20/0x44 (...) Mark the function notrace to avoid it being traced. Link: http://lkml.kernel.org/r/1498028607-6765-1-git-send-email-marcin.nowakowski@xxxxxxxxxx Signed-off-by: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx> Reviewed-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Meyer <thomas@xxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx> Cc: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- kernel/extable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN kernel/extable.c~kernel-extablec-mark-core_kernel_text-notrace kernel/extable.c --- a/kernel/extable.c~kernel-extablec-mark-core_kernel_text-notrace +++ a/kernel/extable.c @@ -69,7 +69,7 @@ static inline int init_kernel_text(unsig return 0; } -int core_kernel_text(unsigned long addr) +int notrace core_kernel_text(unsigned long addr) { if (addr >= (unsigned long)_stext && addr < (unsigned long)_etext) _