linux-kernel - [PATCH 1/1] cachefiles: fix build with GCC 15

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Message-ID: <20250121091530.1316673-1-brahmajit.xyz@gmail.com>
Date: Tue, 21 Jan 2025 14:45:30 +0530
From: Brahmajit Das <brahmajit.xyz@...il.com>
To: dhowells@...hat.com
Cc: netfs@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] cachefiles: fix build with GCC 15

While building with GCC 15 I noticed these build error

fs/cachefiles/key.c:12:9: error: initializer-string for array of ‘char’ is too long [-Werror=unterminated-string-initialization]
   12 |         "0123456789"                    /* 0 - 9 */
      |         ^~~~~~~~~~~~
cc1: all warnings being treated as errors

This due to GCC 15 having enabled -Wunterminated-string-initialization
by default[0]. Separating each characters to ensure NUL termination of
char array.

[0]: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wno-unterminated-string-initialization

Signed-off-by: Brahmajit Das <brahmajit.xyz@...il.com>
---
 fs/cachefiles/key.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/cachefiles/key.c b/fs/cachefiles/key.c
index bf935e25bdbe..555a0ec9eff4 100644
--- a/fs/cachefiles/key.c
+++ b/fs/cachefiles/key.c
@@ -8,12 +8,14 @@
 #include <linux/slab.h>
 #include "internal.h"
 
-static const char cachefiles_charmap[64] =
-	"0123456789"			/* 0 - 9 */
-	"abcdefghijklmnopqrstuvwxyz"	/* 10 - 35 */
-	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"	/* 36 - 61 */
-	"_-"				/* 62 - 63 */
-	;
+static const char cachefiles_charmap[64] = {
+	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', /* 0 - 9 */
+	'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 10 - 35 */
+	'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', /* 10 - 35 */
+	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', /* 36 - 61 */
+	'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', /* 36 - 61 */
+	'_', '-' /* 62 - 63 */
+}; 
 
 static const char cachefiles_filecharmap[256] = {
 	/* we skip space and tab and control chars */
-- 
2.48.1