4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Sterba <dsterba@xxxxxxxx>
[ Upstream commit b8e947e9f64cac9df85a07672b658df5b2bcff07 ]
Some arch + compiler combinations report a potentially unused variable
location in btrfs_lookup_dentry(). This is a false alert as the variable
is passed by value and always valid or there's an error. The compilers
cannot probably reason about that although btrfs_inode_by_name() is in
the same file.
> + /kisskb/src/fs/btrfs/inode.c: error: 'location.objectid' may be used
+uninitialized in this function [-Werror=maybe-uninitialized]: => 5603:9
> + /kisskb/src/fs/btrfs/inode.c: error: 'location.type' may be used
+uninitialized in this function [-Werror=maybe-uninitialized]: => 5674:5
m68k-gcc8/m68k-allmodconfig
mips-gcc8/mips-allmodconfig
powerpc-gcc5/powerpc-all{mod,yes}config
powerpc-gcc5/ppc64_defconfig
Initialize it to zero, this should fix the warnings and won't change the
behaviour as btrfs_inode_by_name() accepts only a root or inode item
types, otherwise returns an error.
Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/linux-btrfs/bd4e9928-17b3-9257-8ba7-6b7f9bbb639a@xxxxxxxxxxxxxx/
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/btrfs/inode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 15ebebed4005..22059aa5eb26 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5869,7 +5869,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
struct inode *inode;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_root *sub_root = root;
- struct btrfs_key location;
+ struct btrfs_key location = { 0 };
u8 di_type = 0;
int index;
int ret = 0;
--
2.43.0
