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SubjectRe: [PATCH] generic arch_futex_atomic_op_inuser() cleanup
On Mon, 15 Jul 2019, Vasily Averin wrote:

> Access to 'op' variable does not require pagefault_disable(),
> 'ret' variable should be initialized before using,
> 'oldval' variable can be replaced by constant.
>
> Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
> ---
> include/asm-generic/futex.h | 8 ++------
> 1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/include/asm-generic/futex.h b/include/asm-generic/futex.h
> index 8666fe7f35d7..e9a9655d786d 100644
> --- a/include/asm-generic/futex.h
> +++ b/include/asm-generic/futex.h
> @@ -118,9 +118,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
> static inline int
> arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval, u32 __user *uaddr)
> {
> - int oldval = 0, ret;
> -
> - pagefault_disable();
> + int ret = 0;

The variable is clearly initialized before using in 'default:', but the
whole function is pretty useless. It's guaranteed to return -ENOSYS and
does nothing else than disabling/enabling pagefaults for no reason.

Thanks,

tglx


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