From: Lorenzo Stoakes lstoakes@gmail.com
This patch has been added to the stable tree. If you have any objections, please let us know.
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[ Upstream commit 3e44c471a2dab210f7e9b1e5f7d4d54d52df59eb ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- kernel/gcov/base.c | 6 ++++++ kernel/gcov/gcc_4_7.c | 4 +++- 2 files changed, 9 insertions(+), 1 deletion(-)
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