[RFC PATCH 12/14] powerpc/ftrace: Drop saving LR to stack save area for -mprofile-kernel
From: Naveen N. Rao <hidden>
Date: 2020-11-26 18:10:49
Also in:
lkml
Subsystem:
function hooks (ftrace), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Steven Rostedt, Masami Hiramatsu, Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
In -mprofile-kernel variant of ftrace_graph_caller(), we save the optionally-updated LR address into the stack save area at the end. This is likely an offshoot of the initial -mprofile-kernel implementation in gcc emitting the same as part of the -mprofile-kernel instruction sequence. However, this is not required. Drop it. Signed-off-by: Naveen N. Rao <redacted> --- arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 2 -- 1 file changed, 2 deletions(-)
diff --git a/arch/powerpc/kernel/trace/ftrace_64_mprofile.S b/arch/powerpc/kernel/trace/ftrace_64_mprofile.S
index bbe871b47ade58..c5602e9b07faa3 100644
--- a/arch/powerpc/kernel/trace/ftrace_64_mprofile.S
+++ b/arch/powerpc/kernel/trace/ftrace_64_mprofile.S@@ -310,7 +310,5 @@ _GLOBAL(ftrace_graph_caller) ld r2, 24(r1) addi r1, r1, SWITCH_FRAME_SIZE - mflr r0 - std r0, LRSAVE(r1) bctr #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
--
2.25.4