6.10-stable review patch. If anyone has any objections, please let me know.
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From: Arnd Bergmann arnd@arndb.de
[ Upstream commit 542440fd7b30983cae23e32bd22f69a076ec7ef4 ]
With gcc-14.1, there is a false-postive -Wuninitialized warning in regcache_maple_drop:
drivers/base/regmap/regcache-maple.c: In function 'regcache_maple_drop': drivers/base/regmap/regcache-maple.c:113:23: error: 'lower_index' is used uninitialized [-Werror=uninitialized] 113 | unsigned long lower_index, lower_last; | ^~~~~~~~~~~ drivers/base/regmap/regcache-maple.c:113:36: error: 'lower_last' is used uninitialized [-Werror=uninitialized] 113 | unsigned long lower_index, lower_last; | ^~~~~~~~~~
I've created a reduced test case to see if this needs to be reported as a gcc, but it appears that the gcc-14.x branch already has a change that turns this into a more sensible -Wmaybe-uninitialized warning, so I ended up not reporting it so far.
The reduced test case also produces a warning for gcc-13 and gcc-12 but I don't see that with the version in the kernel.
Link: https://godbolt.org/z/oKbohKqd3 Link: https://lore.kernel.org/all/CAMuHMdWj=FLmkazPbYKPevDrcym2_HDb_U7Mb9YE9ovrP0j... Signed-off-by: Arnd Bergmann arnd@arndb.de Link: https://patch.msgid.link/20240719104030.1382465-1-arnd@kernel.org Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/base/regmap/regcache-maple.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/base/regmap/regcache-maple.c b/drivers/base/regmap/regcache-maple.c index e42433404854..4c034c813126 100644 --- a/drivers/base/regmap/regcache-maple.c +++ b/drivers/base/regmap/regcache-maple.c @@ -110,7 +110,8 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min, struct maple_tree *mt = map->cache; MA_STATE(mas, mt, min, max); unsigned long *entry, *lower, *upper; - unsigned long lower_index, lower_last; + /* initialized to work around false-positive -Wuninitialized warning */ + unsigned long lower_index = 0, lower_last = 0; unsigned long upper_index, upper_last; int ret = 0;