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

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>

1 files changed, 2 insertions, 82 deletions

diff --git a/kernel/gcov/base.c b/kernel/gcov/base.c
index 9c7c8d5c18f2..799d42072727 100644
--- a/kernel/gcov/base.c
+++ b/kernel/gcov/base.c
@@ -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()