[PATCH 2/4] perf_counter: powerpc: Support the anonymized kernel callchain bits

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

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Adds support for anonymized kernel callchains to the powerpc callchain
code.

This patch is not folded into the patch that introduces this feature
because the powerpc callchain code isn't upstream yet, and this allows
re-ordering the patches.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 arch/powerpc/kernel/perf_callchain.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6/arch/powerpc/kernel/perf_callchain.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/perf_callchain.c
+++ linux-2.6/arch/powerpc/kernel/perf_callchain.c
@@ -70,6 +70,11 @@ static void perf_callchain_kernel(struct
 	lr = regs->link;
 	sp = regs->gpr[1];
 	callchain_store(entry, PERF_CONTEXT_KERNEL);
+	next_ip = perf_paranoid_anon_ip();
+	if (next_ip) {
+		callchain_store(entry, next_ip);
+		return;
+	}
 	callchain_store(entry, regs->nip);
 
 	if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))

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