gcov: add support for checksum field

commit e96b95c2b7a63a454b6498e2df67aac14d046d13 upstream.

In GCC version 12.1 a checksum field was added.

This patch fixes a kernel crash occurring during boot when using
gcov-kernel with GCC version 12.2.  The crash occurred on a system running
on i.MX6SX.

Link: https://lkml.kernel.org/r/20221220102318.3418501-1-rickaran@axis.com
Fixes: 977ef30a7d88 ("gcov: support GCC 12.1 and newer compilers")
Signed-off-by: Rickard x Andersson <rickaran@axis.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Tested-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Martin Liska <mliska@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/gcov/gcc_4_7.c b/kernel/gcov/gcc_4_7.c
index 7971e98..74a4ef1 100644 (file)
--- a/kernel/gcov/gcc_4_7.c
+++ b/kernel/gcov/gcc_4_7.c
@@ -82,6 +82,7 @@ struct gcov_fn_info {
  * @version: gcov version magic indicating the gcc version used for compilation
  * @next: list head for a singly-linked list
  * @stamp: uniquifying time stamp
+ * @checksum: unique object checksum
  * @filename: name of the associated gcov data file
  * @merge: merge functions (null for unused counter type)
  * @n_functions: number of instrumented functions
@@ -94,6 +95,10 @@ struct gcov_info {
        unsigned int version;
        struct gcov_info *next;
        unsigned int stamp;
+ /* Since GCC 12.1 a checksum field is added. */
+#if (__GNUC__ >= 12)
+       unsigned int checksum;
+#endif
        const char *filename;
        void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
        unsigned int n_functions;