From 290342f66108638048997b71393f0dd88e771352 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 25 Mar 2019 14:02:25 +0100 Subject: [PATCH] btrfs: use BUG() instead of BUG_ON(1) BUG_ON(1) leads to bogus warnings from clang when CONFIG_PROFILE_ANNOTATED_BRANCHES is set: fs/btrfs/volumes.c:5041:3: error: variable 'max_chunk_size' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] BUG_ON(1); ^~~~~~~~~ include/asm-generic/bug.h:61:36: note: expanded from macro 'BUG_ON' #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) ^~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:48:23: note: expanded from macro 'unlikely' # define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x))) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/btrfs/volumes.c:5046:9: note: uninitialized use occurs here max_chunk_size); ^~~~~~~~~~~~~~ include/linux/kernel.h:860:36: note: expanded from macro 'min' #define min(x, y) __careful_cmp(x, y, <) ^ include/linux/kernel.h:853:17: note: expanded from macro '__careful_cmp' __cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op)) ^ include/linux/kernel.h:847:25: note: expanded from macro '__cmp_once' typeof(y) unique_y = (y); \ ^ fs/btrfs/volumes.c:5041:3: note: remove the 'if' if its condition is always true BUG_ON(1); ^ include/asm-generic/bug.h:61:32: note: expanded from macro 'BUG_ON' #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) ^ fs/btrfs/volumes.c:4993:20: note: initialize the variable 'max_chunk_size' to silence this warning u64 max_chunk_size; ^ = 0 Change it to BUG() so clang can see that this code path can never continue. Reviewed-by: Nikolay Borisov Reviewed-by: David Sterba Signed-off-by: Arnd Bergmann Signed-off-by: David Sterba --- fs/btrfs/backref.c | 4 ++-- fs/btrfs/ctree.c | 4 ++-- fs/btrfs/extent_io.c | 8 ++++---- fs/btrfs/file.c | 2 +- fs/btrfs/inode.c | 2 +- fs/btrfs/volumes.c | 2 +- 6 files changed, 11 insertions(+), 11 deletions(-) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index 11459fe84a29..2602072ed906 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -791,7 +791,7 @@ static int add_delayed_refs(const struct btrfs_fs_info *fs_info, count = node->ref_mod * -1; break; default: - BUG_ON(1); + BUG(); } *total_refs += count; switch (node->type) { @@ -1747,7 +1747,7 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical, else if (flags & BTRFS_EXTENT_FLAG_DATA) *flags_ret = BTRFS_EXTENT_FLAG_DATA; else - BUG_ON(1); + BUG(); return 0; } diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 65b12963e72b..7b1bc25f10cb 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -4684,7 +4684,7 @@ void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path, btrfs_print_leaf(leaf); btrfs_crit(fs_info, "slot %d too large, nritems %d", slot, nritems); - BUG_ON(1); + BUG(); } /* @@ -4764,7 +4764,7 @@ void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path, btrfs_print_leaf(leaf); btrfs_crit(fs_info, "slot %d old_data %d data_end %d", slot, old_data, data_end); - BUG_ON(1); + BUG(); } /* * item0..itemN ... dataN.offset..dataN.size .. data0.size diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 7eb7f8a30ec2..66b4637b29b3 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -5786,13 +5786,13 @@ void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, btrfs_err(fs_info, "memmove bogus src_offset %lu move len %lu dst len %lu", src_offset, len, dst->len); - BUG_ON(1); + BUG(); } if (dst_offset + len > dst->len) { btrfs_err(fs_info, "memmove bogus dst_offset %lu move len %lu dst len %lu", dst_offset, len, dst->len); - BUG_ON(1); + BUG(); } while (len > 0) { @@ -5833,13 +5833,13 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, btrfs_err(fs_info, "memmove bogus src_offset %lu move len %lu len %lu", src_offset, len, dst->len); - BUG_ON(1); + BUG(); } if (dst_offset + len > dst->len) { btrfs_err(fs_info, "memmove bogus dst_offset %lu move len %lu len %lu", dst_offset, len, dst->len); - BUG_ON(1); + BUG(); } if (dst_offset < src_offset) { memcpy_extent_buffer(dst, dst_offset, src_offset, len); diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 94c1c86fd18a..5e6aee84daee 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1025,7 +1025,7 @@ delete_extent_item: continue; } - BUG_ON(1); + BUG(); } if (!ret && del_nr > 0) { diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a59619631194..4706018d1f9e 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1451,7 +1451,7 @@ next_slot: extent_end = ALIGN(extent_end, fs_info->sectorsize); } else { - BUG_ON(1); + BUG(); } out_check: if (extent_end <= start) { diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index db934ceae9c1..fcb0d3f34e09 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -5038,7 +5038,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, } else { btrfs_err(info, "invalid chunk type 0x%llx requested", type); - BUG_ON(1); + BUG(); } /* We don't want a chunk larger than 10% of writable space */ -- 2.30.2