linux-kernel - [PATCH] gcov: Add support for GCC 15

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Message-ID: <20251028115125.1319410-1-oberpar@linux.ibm.com>
Date: Tue, 28 Oct 2025 12:51:25 +0100
From: Peter Oberparleiter <oberpar@...ux.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Matthieu Baerts <matttbe@...nel.org>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>
Subject: [PATCH] gcov: Add support for GCC 15

Using gcov on kernels compiled with GCC 15 results in truncated 16-byte
long .gcda files with no usable data.  To fix this, update GCOV_COUNTERS
to match the value defined by GCC 15.

Tested with GCC 14.3.0 and GCC 15.2.0.

Reported-by: Matthieu Baerts <matttbe@...nel.org>
Closes: https://github.com/linux-test-project/lcov/issues/445
Tested-by: Matthieu Baerts <matttbe@...nel.org>
Cc: <stable@...r.kernel.org>
Signed-off-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
---
 kernel/gcov/gcc_4_7.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/gcov/gcc_4_7.c b/kernel/gcov/gcc_4_7.c
index a08cc076f332..ffde93d051a4 100644
--- a/kernel/gcov/gcc_4_7.c
+++ b/kernel/gcov/gcc_4_7.c
@@ -18,7 +18,9 @@
 #include <linux/mm.h>
 #include "gcov.h"
 
-#if (__GNUC__ >= 14)
+#if (__GNUC__ >= 15)
+#define GCOV_COUNTERS			10
+#elif (__GNUC__ >= 14)
 #define GCOV_COUNTERS			9
 #elif (__GNUC__ >= 10)
 #define GCOV_COUNTERS			8
-- 
2.48.1