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

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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: Naveen N Rao <naveen@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241030070850.1361304-8-hbathini@linux.ibm.com
This commit is contained in:
Naveen N Rao
2024-10-30 12:38:40 +05:30
committed by Michael Ellerman
parent 8b0dc1305e
commit 1d59bd2fc0
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/trace/ftrace.c
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@@ -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;