The patch titled Subject: gcov: support GCC 12.1 and newer compilers has been added to the -mm mm-hotfixes-unstable branch. Its filename is gcov-support-gcc-121-and-newer-compilers.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Martin Liska mliska@suse.cz Subject: gcov: support GCC 12.1 and newer compilers Date: Thu, 13 Oct 2022 09:40:59 +0200

Starting with GCC 12.1, there are 2 significant changes to the .gcda file format that needs to be supported:

a) [gcov: Use system IO buffering] (23eb66d1d46a34cb28c4acbdf8a1deb80a7c5a05) changed that all sizes in the format are in bytes and not in words (4B) b) [gcov: make profile merging smarter] (72e0c742bd01f8e7e6dcca64042b9ad7e75979de) add a new checksum to the file header.

Tested with GCC 7.5, 10.4, 12.2 and the current master.

Link: https://lkml.kernel.org/r/624bda92-f307-30e9-9aaa-8cc678b2dfb2@suse.cz Signed-off-by: Martin Liska mliska@suse.cz Tested-by: Peter Oberparleiter oberpar@linux.ibm.com Reviewed-by: Peter Oberparleiter oberpar@linux.ibm.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

kernel/gcov/gcc_4_7.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-)

--- a/kernel/gcov/gcc_4_7.c~gcov-support-gcc-121-and-newer-compilers +++ a/kernel/gcov/gcc_4_7.c @@ -30,6 +30,13 @@

#define GCOV_TAG_FUNCTION_LENGTH 3

+/* Since GCC 12.1 sizes are in BYTES and not in WORDS (4B). */ +#if (__GNUC__ >= 12) +#define GCOV_UNIT_SIZE 4 +#else +#define GCOV_UNIT_SIZE 1 +#endif + static struct gcov_info *gcov_info_head;

/** @@ -383,12 +390,18 @@ size_t convert_to_gcda(char *buffer, str pos += store_gcov_u32(buffer, pos, info->version); pos += store_gcov_u32(buffer, pos, info->stamp);

+#if (__GNUC__ >= 12) + /* Use zero as checksum of the compilation unit. */ + pos += store_gcov_u32(buffer, pos, 0); +#endif + for (fi_idx = 0; fi_idx < info->n_functions; fi_idx++) { fi_ptr = info->functions[fi_idx];

/* Function record. */ pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION); - pos += store_gcov_u32(buffer, pos, GCOV_TAG_FUNCTION_LENGTH); + pos += store_gcov_u32(buffer, pos, + GCOV_TAG_FUNCTION_LENGTH * GCOV_UNIT_SIZE); pos += store_gcov_u32(buffer, pos, fi_ptr->ident); pos += store_gcov_u32(buffer, pos, fi_ptr->lineno_checksum); pos += store_gcov_u32(buffer, pos, fi_ptr->cfg_checksum); @@ -402,7 +415,8 @@ size_t convert_to_gcda(char *buffer, str /* Counter record. */ pos += store_gcov_u32(buffer, pos, GCOV_TAG_FOR_COUNTER(ct_idx)); - pos += store_gcov_u32(buffer, pos, ci_ptr->num * 2); + pos += store_gcov_u32(buffer, pos, + ci_ptr->num * 2 * GCOV_UNIT_SIZE);

for (cv_idx = 0; cv_idx < ci_ptr->num; cv_idx++) { pos += store_gcov_u64(buffer, pos, _

Patches currently in -mm which might be from mliska@suse.cz are

gcov-support-gcc-121-and-newer-compilers.patch