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| author | Anju T <anju@linux.vnet.ibm.com> | 2017-02-08 10:50:52 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-02-10 03:28:05 +0100 |
| commit | 762df10bad6954b353ee649c387a8ffacf6dc347 (patch) | |
| tree | 5dfc2db1b445fcd4e7124f08b45329f157e49456 /arch/powerpc/kernel/optprobes.c | |
| parent | powerpc/kprobes: Implement Optprobes (diff) | |
| download | linux-762df10bad6954b353ee649c387a8ffacf6dc347.tar.xz linux-762df10bad6954b353ee649c387a8ffacf6dc347.zip | |
powerpc/kprobes: Optimize kprobe in kretprobe_trampoline()
Kprobe placed on the kretprobe_trampoline() during boot time can be
optimized, since the instruction at probe point is a 'nop'.
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/optprobes.c')
| -rw-r--r-- | arch/powerpc/kernel/optprobes.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/optprobes.c b/arch/powerpc/kernel/optprobes.c index 17f4c94142d3..2282bf4e63cd 100644 --- a/arch/powerpc/kernel/optprobes.c +++ b/arch/powerpc/kernel/optprobes.c @@ -72,12 +72,11 @@ static unsigned long can_optimize(struct kprobe *p) /* * kprobe placed for kretprobe during boot time - * is not optimizing now. - * - * TODO: Optimize kprobe in kretprobe_trampoline + * has a 'nop' instruction, which can be emulated. + * So further checks can be skipped. */ if (p->addr == (kprobe_opcode_t *)&kretprobe_trampoline) - return 0; + return (unsigned long)p->addr + sizeof(kprobe_opcode_t); /* * We only support optimizing kernel addresses, but not |