Commit b1643084 authored by Kajol Jain's avatar Kajol Jain Committed by Michael Ellerman
Browse files

powerpc/perf: Use stack siar instead of mfspr 



Minor optimization in the 'perf_instruction_pointer' function code by
making use of stack siar instead of mfspr.

Fixes: 75382aa7 ("powerpc/perf: Move code to select SIAR or pt_regs into perf_read_regs")
Signed-off-by: default avatarKajol Jain <kjain@linux.ibm.com>
Tested-by: default avatarNageswara R Sastry <rnsastry@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210818171556.36912-1-kjain@linux.ibm.com
parent 9401f4e4

arch/powerpc/perf/core-book3s.c

+1 −1
Original line number Diff line number Diff line
@@ -2269,7 +2269,7 @@ 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