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Date: Fri, 22 Mar 2019 15:07:47 +0100 From: Arnd Bergmann <arnd@...db.de> To: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, David Sterba <dsterba@...e.com> Cc: clang-built-linux@...glegroups.com, Nick Desaulniers <ndesaulniers@...gle.com>, Nathan Chancellor <natechancellor@...il.com>, Arnd Bergmann <arnd@...db.de>, Nikolay Borisov <nborisov@...e.com>, Lu Fengqi <lufq.fnst@...fujitsu.com>, Anand Jain <anand.jain@...cle.com>, linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] btrfs: work around false-positive -Wsometimes-uninitialized warning clang fails to see that the last 'else if() in btrfs_uuid_tree_add() is always true, so 'eb' is always initialized correctly: fs/btrfs/uuid-tree.c:129:13: error: variable 'eb' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] } else if (ret < 0) { ^~~~~~~ fs/btrfs/uuid-tree.c:139:22: note: uninitialized use occurs here write_extent_buffer(eb, &subid_le, offset, sizeof(subid_le)); ^~ fs/btrfs/uuid-tree.c:129:9: note: remove the 'if' if its condition is always true } else if (ret < 0) { ^~~~~~~~~~~~~ fs/btrfs/uuid-tree.c:90:26: note: initialize the variable 'eb' to silence this warning struct extent_buffer *eb; ^ = NULL Change it into a plain 'else' to shut up that warning. Link: https://bugs.llvm.org/show_bug.cgi?id=41197 Signed-off-by: Arnd Bergmann <arnd@...db.de> --- fs/btrfs/uuid-tree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/uuid-tree.c b/fs/btrfs/uuid-tree.c index 3b2ae342e649..c1cc9a5c0024 100644 --- a/fs/btrfs/uuid-tree.c +++ b/fs/btrfs/uuid-tree.c @@ -126,7 +126,7 @@ int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, slot = path->slots[0]; offset = btrfs_item_ptr_offset(eb, slot); offset += btrfs_item_size_nr(eb, slot) - sizeof(subid_le); - } else if (ret < 0) { + } else { btrfs_warn(fs_info, "insert uuid item failed %d (0x%016llx, 0x%016llx) type %u!", ret, (unsigned long long)key.objectid, -- 2.20.0
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