linux-kernel - [PATCH v4] gcov: add support for GCC 4.9

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Message-ID: <001f01cf6f2c$d4e62350$7eb269f0$@sei.pku.edu.cn>
Date:	Wed, 14 May 2014 12:27:35 +0800
From:	"Yuan Pengfei" <yuanpf12@....pku.edu.cn>
To:	"'Andi Kleen'" <andi@...stfloor.org>
Cc:	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	"'Peter Oberparleiter'" <oberpar@...ux.vnet.ibm.com>,
	<linux-kernel@...r.kernel.org>,
	"'Yuan Pengfei'" <yuanpf12@....pku.edu.cn>
Subject: [PATCH v4] gcov: add support for GCC 4.9

From: Yuan Pengfei <coolypf@...com>

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@...com>
---
 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 f45b75b..b358a80 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 7465944..7f74b59 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;
-- 
2.0.0.rc2


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