From a992bf836f9c3039a16f4bd068d161c86c6c3e2c Mon Sep 17 00:00:00 2001
From: Yuan Pengfei <coolypf@qq.com>
Date: Tue, 10 Jun 2014 15:18:39 -0700
Subject: [PATCH] gcov: add support for GCC 4.9
This patch handles the gcov-related changes in GCC 4.9:
A new counter (time profile) is added. The total number is 9 now.
A new profile merge function __gcov_merge_time_profile is added.
See gcc/gcov-io.h and libgcc/libgcov-merge.c
For the first change, the layout of struct gcov_info is affected.
For the second one, a dummy function is added to kernel/gcov/base.c
similarly.
Signed-off-by: Yuan Pengfei <coolypf@qq.com>
Acked-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
kernel/gcov/base.c | 6 ++++++
kernel/gcov/gcc_4_7.c | 5 +++++
2 files changed, 11 insertions(+)
diff --git a/kernel/gcov/base.c b/kernel/gcov/base.c
index f45b75b713c0ee..b358a802fd1843 100644
--- a/kernel/gcov/base.c
+++ b/kernel/gcov/base.c
@@ -85,6 +85,12 @@ void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
}
EXPORT_SYMBOL(__gcov_merge_ior);
+void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
+{
+ /* Unused. */
+}
+EXPORT_SYMBOL(__gcov_merge_time_profile);
+
/**
* gcov_enable_events - enable event reporting through gcov_event()
*
diff --git a/kernel/gcov/gcc_4_7.c b/kernel/gcov/gcc_4_7.c
index 2c6e4631c814e1..826ba9fb5e3277 100644
--- a/kernel/gcov/gcc_4_7.c
+++ b/kernel/gcov/gcc_4_7.c
@@ -18,7 +18,12 @@
#include <linux/vmalloc.h>
#include "gcov.h"
+#if __GNUC__ == 4 && __GNUC_MINOR__ >= 9
+#define GCOV_COUNTERS 9
+#else
#define GCOV_COUNTERS 8
+#endif
+
#define GCOV_TAG_FUNCTION_LENGTH 3
static struct gcov_info *gcov_info_head;
--
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