linux-kernel - [PATCH 1/6] perf/x86: check perf_callchain

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Message-Id: <dce6d60bab08be2600efd90021d9b85620646161.1472057064.git.jpoimboe@redhat.com>
Date:   Wed, 24 Aug 2016 11:50:14 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Byungchul Park <byungchul.park@....com>,
        Nilay Vaish <nilayvaish@...il.com>
Subject: [PATCH 1/6] perf/x86: check perf_callchain_store() error

Add a check to perf_callchain_kernel() so that it returns early if the
callchain entry array is already full.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 arch/x86/events/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 18a1acf..dcaa887 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2297,7 +2297,8 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re
 		return;
 	}
 
-	perf_callchain_store(entry, regs->ip);
+	if (perf_callchain_store(entry, regs->ip))
+		return;
 
 	dump_trace(NULL, regs, NULL, 0, &backtrace_ops, entry);
 }
-- 
2.7.4