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| author | Kees Cook <keescook@chromium.org> | 2020-06-03 13:09:38 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-11 11:33:32 +0200 |
| commit | d68627697d173a236b9b8468ed5d928cab7a7d61 (patch) | |
| tree | b9a3efb040943c8bc54e2b0f82e78f19c23c4245 /mm/mempolicy.c | |
| parent | 8f23778dced48d9db8bbe607e3297fe1efc837c1 (diff) | |
| download | linux-stable-d68627697d173a236b9b8468ed5d928cab7a7d61.tar.gz linux-stable-d68627697d173a236b9b8468ed5d928cab7a7d61.tar.bz2 linux-stable-d68627697d173a236b9b8468ed5d928cab7a7d61.zip | |
treewide: Remove uninitialized_var() usage
commit 3f649ab728cda8038259d8f14492fe400fbab911 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 19552bcc592d..0411f0e25ce4 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1130,7 +1130,7 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, static struct page *new_page(struct page *page, unsigned long start, int **x) { struct vm_area_struct *vma; - unsigned long uninitialized_var(address); + unsigned long address; vma = find_vma(current->mm, start); while (vma) { @@ -1504,7 +1504,7 @@ SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, unsigned long, addr, unsigned long, flags) { int err; - int uninitialized_var(pval); + int pval; nodemask_t nodes; if (nmask != NULL && maxnode < nr_node_ids) |