linux-kernel - [PATCH 3.18 03/24] gcov: add support for GCC 5.1

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Message-Id: <20170831154105.290914777@linuxfoundation.org>
Date:   Thu, 31 Aug 2017 17:43:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lorenzo Stoakes <lstoakes@...il.com>,
        Andrey Ryabinin <a.ryabinin@...sung.com>,
        Yuan Pengfei <coolypf@...com>,
        Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3.18 03/24] gcov: add support for GCC 5.1

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lorenzo Stoakes <lstoakes@...il.com>

commit 3e44c471a2dab210f7e9b1e5f7d4d54d52df59eb upstream.

Fix kernel gcov support for GCC 5.1.  Similar to commit a992bf836f9
("gcov: add support for GCC 4.9"), this patch takes into account the
existence of a new gcov counter (see gcc's gcc/gcov-counter.def.)

Firstly, it increments GCOV_COUNTERS (to 10), which makes the data
structure struct gcov_info compatible with GCC 5.1.

Secondly, a corresponding counter function __gcov_merge_icall_topn (Top N
value tracking for indirect calls) is included in base.c with the other
gcov counters unused for kernel profiling.

Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
Cc: Andrey Ryabinin <a.ryabinin@...sung.com>
Cc: Yuan Pengfei <coolypf@...com>
Tested-by: Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/gcov/base.c    |    6 ++++++
 kernel/gcov/gcc_4_7.c |    4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

--- a/kernel/gcov/base.c
+++ b/kernel/gcov/base.c
@@ -91,6 +91,12 @@ void __gcov_merge_time_profile(gcov_type
 }
 EXPORT_SYMBOL(__gcov_merge_time_profile);
 
+void __gcov_merge_icall_topn(gcov_type *counters, unsigned int n_counters)
+{
+	/* Unused. */
+}
+EXPORT_SYMBOL(__gcov_merge_icall_topn);
+
 /**
  * gcov_enable_events - enable event reporting through gcov_event()
  *
--- a/kernel/gcov/gcc_4_7.c
+++ b/kernel/gcov/gcc_4_7.c
@@ -18,7 +18,9 @@
 #include <linux/vmalloc.h>
 #include "gcov.h"
 
-#if __GNUC__ == 4 && __GNUC_MINOR__ >= 9
+#if __GNUC__ == 5 && __GNUC_MINOR__ >= 1
+#define GCOV_COUNTERS			10
+#elif __GNUC__ == 4 && __GNUC_MINOR__ >= 9
 #define GCOV_COUNTERS			9
 #else
 #define GCOV_COUNTERS			8