From: Anton Blanchard <anton@samba.org>
To: benh@kernel.crashing.org, paulus@samba.org, sukadev@linux.vnet.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 4/4] powerpc/perf: Use perf_instruction_pointer in callchains
Date: Tue, 26 Jun 2012 21:04:20 +1000 [thread overview]
Message-ID: <20120626210420.4e5e7e78@kryten> (raw)
In-Reply-To: <20120626210013.2fbb9044@kryten>
We use SIAR or regs->nip for the instruction pointer depending on
the PMU configuration, but we always use regs->nip in the callchain.
Use perf_instruction_pointer so the backtrace is consistent.
Signed-off-by: Anton Blanchard <anton@samba.org>
---
Index: linux-build/arch/powerpc/perf/callchain.c
===================================================================
--- linux-build.orig/arch/powerpc/perf/callchain.c 2012-04-12 11:36:26.236223786 +1000
+++ linux-build/arch/powerpc/perf/callchain.c 2012-06-26 12:49:28.944202712 +1000
@@ -57,7 +57,7 @@ perf_callchain_kernel(struct perf_callch
lr = regs->link;
sp = regs->gpr[1];
- perf_callchain_store(entry, regs->nip);
+ perf_callchain_store(entry, perf_instruction_pointer(regs));
if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))
return;
@@ -238,7 +238,7 @@ static void perf_callchain_user_64(struc
struct signal_frame_64 __user *sigframe;
unsigned long __user *fp, *uregs;
- next_ip = regs->nip;
+ next_ip = perf_instruction_pointer(regs);
lr = regs->link;
sp = regs->gpr[1];
perf_callchain_store(entry, next_ip);
@@ -444,7 +444,7 @@ static void perf_callchain_user_32(struc
long level = 0;
unsigned int __user *fp, *uregs;
- next_ip = regs->nip;
+ next_ip = perf_instruction_pointer(regs);
lr = regs->link;
sp = regs->gpr[1];
perf_callchain_store(entry, next_ip);
next prev parent reply other threads:[~2012-06-26 11:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-26 11:00 [PATCH 1/4] powerpc/perf: Create mmcra_sihv/mmcra_sipv helpers Anton Blanchard
2012-06-26 11:01 ` [PATCH 2/4] powerpc/perf: Move code to select SIAR or pt_regs into perf_read_regs Anton Blanchard
2012-06-26 11:02 ` [PATCH 3/4] powerpc/perf: Always use pt_regs for userspace samples Anton Blanchard
2012-06-26 11:04 ` Anton Blanchard [this message]
2012-06-26 23:04 ` [PATCH 4/4] powerpc/perf: Use perf_instruction_pointer in callchains Scott Wood
2012-06-27 3:59 ` Anton Blanchard
2012-06-27 15:03 ` Scott Wood
2012-07-09 4:20 ` [PATCH 1/4] powerpc/perf: Create mmcra_sihv/mmcra_sipv helpers Anshuman Khandual
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