Commit 1d59bd2f authored by Naveen N Rao's avatar Naveen N Rao Committed by Michael Ellerman
Browse files

powerpc/ftrace: Skip instruction patching if the instructions are the same 



To simplify upcoming changes to ftrace, add a check to skip actual
instruction patching if the old and new instructions are the same. We
still validate that the instruction is what we expect, but don't
actually patch the same instruction again.

Signed-off-by: default avatarNaveen N Rao <naveen@kernel.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241030070850.1361304-8-hbathini@linux.ibm.com
parent 8b0dc130

arch/powerpc/kernel/trace/ftrace.c

+1 −1
Original line number Diff line number Diff line
@@ -82,7 +82,7 @@ static inline int ftrace_modify_code(unsigned long ip, ppc_inst_t old, ppc_inst_ 
{

	int ret = ftrace_validate_inst(ip, old);



	if (!ret)

	if (!ret && !ppc_inst_equal(old, new))

		ret = patch_instruction((u32 *)ip, new);



	return ret;