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authorLorenzo Stoakes <lstoakes@gmail.com>2015-07-01 00:57:49 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-07-01 05:44:57 +0300
commit3e44c471a2dab210f7e9b1e5f7d4d54d52df59eb (patch)
treee3d413909c8a2c969b96a94243337fa0af51163c
parent5375b708f2547f70cd2bee2fd8663ab7035f9551 (diff)
downloadlinux-3e44c471a2dab210f7e9b1e5f7d4d54d52df59eb.tar.xz
gcov: add support for GCC 5.1
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@gmail.com> Cc: Andrey Ryabinin <a.ryabinin@samsung.com> Cc: Yuan Pengfei <coolypf@qq.com> Tested-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Reviewed-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>
-rw-r--r--kernel/gcov/base.c6
-rw-r--r--kernel/gcov/gcc_4_7.c4
2 files changed, 9 insertions, 1 deletions
diff --git a/kernel/gcov/base.c b/kernel/gcov/base.c
index a744098e4eb7..7080ae1eb6c1 100644
--- a/kernel/gcov/base.c
+++ b/kernel/gcov/base.c
@@ -92,6 +92,12 @@ void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
}
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()
*
diff --git a/kernel/gcov/gcc_4_7.c b/kernel/gcov/gcc_4_7.c
index 826ba9fb5e32..e25e92fb44fa 100644
--- 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