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| author | Arnd Bergmann <arnd@arndb.de> | 2024-07-19 12:40:24 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2024-07-22 13:04:04 +0100 |
| commit | 542440fd7b30983cae23e32bd22f69a076ec7ef4 (patch) | |
| tree | ff7949711e335814366df1f5faaab3341c348820 /drivers/base | |
| parent | c2bb8198fee88a428513f8d023c627ecd13aa694 (diff) | |
| download | lwn-542440fd7b30983cae23e32bd22f69a076ec7ef4.tar.gz lwn-542440fd7b30983cae23e32bd22f69a076ec7ef4.zip | |
regmap: maple: work around gcc-14.1 false-positive warning
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_U7Mb9YE9ovrP0jJfA@mail.gmail.com/
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>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regcache-maple.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/base/regmap/regcache-maple.c b/drivers/base/regmap/regcache-maple.c index f0df2da6d522..2dea9d259c49 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; |