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gcov: clang: move common GCC code into gcc_base.c

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Patch series "gcov: add Clang support", v4.

This patch (of 3):

base.c contains a few callbacks specific to GCC's gcov implementation.
Move these into their own module in preparation for Clang support.

Link: http://lkml.kernel.org/r/20190318025411.98014-2-trong@android.com
Signed-off-by: Greg Hackmann <ghackmann@android.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Tri Vo <trong@android.com>
Tested-by: Trilok Soni <tsoni@quicinc.com>
Tested-by: Prasad Sodagudi <psodagud@quicinc.com>
Tested-by: Tri Vo <trong@android.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: Daniel Mentz <danielmentz@google.com>
Cc: Petri Gynther <pgynther@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Greg Hackmann 2019-05-14 15:45:25 -07:00 committed by Linus Torvalds
parent ce528c4c20
commit 826eba0d77
4 changed files with 93 additions and 84 deletions
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4
kernel/gcov/Makefile
View File

@ -2,5 +2,5 @@
ccflags-y := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"'
obj-y := base.o fs.o
obj-$(CONFIG_GCOV_FORMAT_3_4) += gcc_3_4.o
obj-$(CONFIG_GCOV_FORMAT_4_7) += gcc_4_7.o
obj-$(CONFIG_GCOV_FORMAT_3_4) += gcc_base.o gcc_3_4.o
obj-$(CONFIG_GCOV_FORMAT_4_7) += gcc_base.o gcc_4_7.o

84
kernel/gcov/base.c
View File

@ -22,88 +22,8 @@
#include <linux/sched.h>
#include "gcov.h"
static int gcov_events_enabled;
static DEFINE_MUTEX(gcov_lock);
/*
* __gcov_init is called by gcc-generated constructor code for each object
* file compiled with -fprofile-arcs.
*/
void __gcov_init(struct gcov_info *info)
{
static unsigned int gcov_version;
mutex_lock(&gcov_lock);
if (gcov_version == 0) {
gcov_version = gcov_info_version(info);
/*
* Printing gcc's version magic may prove useful for debugging
* incompatibility reports.
*/
pr_info("version magic: 0x%x\n", gcov_version);
}
/*
* Add new profiling data structure to list and inform event
* listener.
*/
gcov_info_link(info);
if (gcov_events_enabled)
gcov_event(GCOV_ADD, info);
mutex_unlock(&gcov_lock);
}
EXPORT_SYMBOL(__gcov_init);
/*
* These functions may be referenced by gcc-generated profiling code but serve
* no function for kernel profiling.
*/
void __gcov_flush(void)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_flush);
void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_add);
void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_single);
void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_delta);
void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_ior);
void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
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);
void __gcov_exit(void)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_exit);
int gcov_events_enabled;
DEFINE_MUTEX(gcov_lock);
/**
* gcov_enable_events - enable event reporting through gcov_event()

86
kernel/gcov/gcc_base.c Normal file
View File

@ -0,0 +1,86 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include "gcov.h"
/*
* __gcov_init is called by gcc-generated constructor code for each object
* file compiled with -fprofile-arcs.
*/
void __gcov_init(struct gcov_info *info)
{
static unsigned int gcov_version;
mutex_lock(&gcov_lock);
if (gcov_version == 0) {
gcov_version = gcov_info_version(info);
/*
* Printing gcc's version magic may prove useful for debugging
* incompatibility reports.
*/
pr_info("version magic: 0x%x\n", gcov_version);
}
/*
* Add new profiling data structure to list and inform event
* listener.
*/
gcov_info_link(info);
if (gcov_events_enabled)
gcov_event(GCOV_ADD, info);
mutex_unlock(&gcov_lock);
}
EXPORT_SYMBOL(__gcov_init);
/*
* These functions may be referenced by gcc-generated profiling code but serve
* no function for kernel profiling.
*/
void __gcov_flush(void)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_flush);
void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_add);
void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_single);
void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_delta);
void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_merge_ior);
void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
{
/* Unused. */
}
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);
void __gcov_exit(void)
{
/* Unused. */
}
EXPORT_SYMBOL(__gcov_exit);

3
kernel/gcov/gcov.h
View File

@ -83,4 +83,7 @@ struct gcov_link {
};
extern const struct gcov_link gcov_link[];
extern int gcov_events_enabled;
extern struct mutex gcov_lock;
#endif /* GCOV_H */