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gcov: add support for GCC 4.9

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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>
(cherry picked from commit a992bf836f)
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Yuan Pengfei 2014-06-10 15:18:39 -07:00 committed by Mark Brown
parent 8ad15c3280
commit 20fde41812
2 changed files with 11 additions and 0 deletions
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6
kernel/gcov/base.c
View File

@ -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()
*

5
kernel/gcov/gcc_4_7.c
View File

@ -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;