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authorKees Cook <keescook@chromium.org>2020-06-03 23:09:38 +0300
committerKees Cook <keescook@chromium.org>2020-07-16 22:35:15 +0300
commit3f649ab728cda8038259d8f14492fe400fbab911 (patch)
treed1552706b153fa98d4c9e99eb2d64913fda5e014 /lib/radix-tree.c
parentd8b44b58a7073b4d74b3394131eb449e8469396b (diff)
downloadlinux-3f649ab728cda8038259d8f14492fe400fbab911.tar.xz
treewide: Remove uninitialized_var() usage
Using uninitialized_var() is dangerous as it papers over real bugs[1] (or can in the future), and suppresses unrelated compiler warnings (e.g. "unused variable"). If the compiler thinks it is uninitialized, either simply initialize the variable or make compiler changes. In preparation for removing[2] the[3] macro[4], remove all remaining needless uses with the following script: git grep '\buninitialized_var\b' | cut -d: -f1 | sort -u | \ xargs perl -pi -e \ 's/\buninitialized_var\(([^\)]+)\)/\1/g; s:\s*/\* (GCC be quiet|to make compiler happy) \*/$::g;' drivers/video/fbdev/riva/riva_hw.c was manually tweaked to avoid pathological white-space. No outstanding warnings were found building allmodconfig with GCC 9.3.0 for x86_64, i386, arm64, arm, powerpc, powerpc64le, s390x, mips, sparc64, alpha, and m68k. [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/ [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ Reviewed-by: Leon Romanovsky <leonro@mellanox.com> # drivers/infiniband and mlx4/mlx5 Acked-by: Jason Gunthorpe <jgg@mellanox.com> # IB Acked-by: Kalle Valo <kvalo@codeaurora.org> # wireless drivers Reviewed-by: Chao Yu <yuchao0@huawei.com> # erofs Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'lib/radix-tree.c')
-rw-r--r--lib/radix-tree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 34e406fe561f..8e4a3a4397f2 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1029,7 +1029,7 @@ void *radix_tree_tag_clear(struct radix_tree_root *root,
{
struct radix_tree_node *node, *parent;
unsigned long maxindex;
- int uninitialized_var(offset);
+ int offset;
radix_tree_load_root(root, &node, &maxindex);
if (index > maxindex)