From 3c9d9d2cc60b5063cda0e92d4b6cdb92da268e7b Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Tue, 14 Apr 2015 07:51:03 +1000 Subject: powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH commit 9a5cbce421a283e6aea3c4007f141735bf9da8c3 upstream. We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH (currently 127), but we forgot to do the same for 64bit backtraces. Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings --- arch/powerpc/kernel/perf_callchain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/powerpc/kernel/perf_callchain.c b/arch/powerpc/kernel/perf_callchain.c index 564c1d8..e80026c 100644 --- a/arch/powerpc/kernel/perf_callchain.c +++ b/arch/powerpc/kernel/perf_callchain.c @@ -243,7 +243,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry, sp = regs->gpr[1]; perf_callchain_store(entry, next_ip); - for (;;) { + while (entry->nr < PERF_MAX_STACK_DEPTH) { fp = (unsigned long __user *) sp; if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp)) return; -- cgit v1.1