[PATCH v4 21/57] perf/x86: check perf_callchain_store() error

From: Josh Poimboeuf
Date: Thu Aug 18 2016 - 09:23:56 EST


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@xxxxxxxxxx>
---
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