diff options
| author | Darrick J. Wong | 2026-02-23 15:06:50 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2026-04-27 07:30:17 -0600 |
| commit | 15cae29f66a641ad0ea988c44e82df443edc55cf (patch) | |
| tree | 9b5dfe5bab78fb52380a28261049191a79fa1654 /fs | |
| parent | a47c99f60fcbfd5e3ba37a78c796dfbd1c1bc514 (diff) | |
fuse: quiet down complaints in fuse_conn_limit_write
commit 129a45f9755a89f573c6a513a6b9e3d234ce89b0 upstream.
gcc 15 complains about an uninitialized variable val that is passed by
reference into fuse_conn_limit_write:
control.c: In function ‘fuse_conn_congestion_threshold_write’:
include/asm-generic/rwonce.h:55:37: warning: ‘val’ may be used uninitialized [-Wmaybe-uninitialized]
55 | *(volatile typeof(x) *)&(x) = (val); \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
include/asm-generic/rwonce.h:61:9: note: in expansion of macro ‘__WRITE_ONCE’
61 | __WRITE_ONCE(x, val); \
| ^~~~~~~~~~~~
control.c:178:9: note: in expansion of macro ‘WRITE_ONCE’
178 | WRITE_ONCE(fc->congestion_threshold, val);
| ^~~~~~~~~~
control.c:166:18: note: ‘val’ was declared here
166 | unsigned val;
| ^~~
Unfortunately there's enough macro spew involved in kstrtoul_from_user
that I think gcc gives up on its analysis and sprays the above warning.
AFAICT it's not actually a bug, but we could just zero-initialize the
variable to enable using -Wmaybe-uninitialized to find real problems.
Previously we would use some weird uninitialized_var annotation to quiet
down the warnings, so clearly this code has been like this for quite
some time.
Cc: stable@vger.kernel.org # v5.9
Fixes: 3f649ab728cda8 ("treewide: Remove uninitialized_var() usage")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/fuse/control.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/fuse/control.c b/fs/fuse/control.c index 140bd5730d99..f902a7fb4630 100644 --- a/fs/fuse/control.c +++ b/fs/fuse/control.c @@ -121,7 +121,7 @@ static ssize_t fuse_conn_max_background_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - unsigned val; + unsigned int val = 0; ssize_t ret; ret = fuse_conn_limit_write(file, buf, count, ppos, &val, @@ -163,7 +163,7 @@ static ssize_t fuse_conn_congestion_threshold_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - unsigned val; + unsigned int val = 0; struct fuse_conn *fc; ssize_t ret; |