Re: [PATCH v2 1/2] powerpc/perf: Use stack siar instead of mfspr
From: kajoljain <hidden>
Date: 2021-08-13 08:30:30
On 8/13/21 1:54 PM, Kajol Jain wrote:
Minor optimization in the 'perf_instruction_pointer' function code by
making use of stack siar instead of mfspr.
Fixes: 75382aa72f06 ("powerpc/perf: Move code to select SIAR or pt_regs
into perf_read_regs")
Signed-off-by: Kajol Jain <redacted>Please ignore this patch-set as I mentioned wrong version number. I will resend this patch-set again with correct version. Sorry for the confusion. Thanks, Kajol Jain
quoted hunk ↗ jump to hunk
--- arch/powerpc/perf/core-book3s.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index bb0ee716de91..1b464aad29c4 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c@@ -2260,7 +2260,7 @@ unsigned long perf_instruction_pointer(struct pt_regs *regs) else return regs->nip; } else if (use_siar && siar_valid(regs)) - return mfspr(SPRN_SIAR) + perf_ip_adjust(regs); + return siar + perf_ip_adjust(regs); else if (use_siar) return 0; // no valid instruction pointer else