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Commit 3e44c471 authored by Lorenzo Stoakes's avatar Lorenzo Stoakes Committed by Linus Torvalds
Browse files

gcov: add support for GCC 5.1 



Fix kernel gcov support for GCC 5.1.  Similar to commit a992bf83
("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: default avatarLorenzo Stoakes <lstoakes@gmail.com>
Cc: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Yuan Pengfei <coolypf@qq.com>
Tested-by: default avatarPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: default avatarPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5375b708

kernel/gcov/base.c

+6 −0
Original line number Diff line number Diff line
@@ -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()

 *

kernel/gcov/gcc_4_7.c

+3 −1
Original line number Diff line number Diff line
@@ -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