linux-kernel - Re: [PATCH] epoll: remove unnecessary bit operation in epoll

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Message-ID: <AANLkTikgBBEznAh1CRwJk5MgorNFpXvRuVLyhYT6sQvw@mail.gmail.com>
Date:	Wed, 12 Jan 2011 15:42:15 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Davide Libenzi <davidel@...ilserver.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] epoll: remove unnecessary bit operation in epoll_create1 syscall

On Wed, Jan 12, 2011 at 11:58 AM, Namhyung Kim <namhyung@...il.com> wrote:
> @flags can have O_CLOEXEC only so bitwise AND is not necessary.
>
> Signed-off-by: Namhyung Kim <namhyung@...il.com>
> ---
>  fs/eventpoll.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/fs/eventpoll.c b/fs/eventpoll.c
> index 8cf07242067d..2e21fb85b8b6 100644
> --- a/fs/eventpoll.c
> +++ b/fs/eventpoll.c
> @@ -1209,7 +1209,7 @@ SYSCALL_DEFINE1(epoll_create1, int, flags)
>         * a file structure and a free file descriptor.
>         */
>        error = anon_inode_getfd("[eventpoll]", &eventpoll_fops, ep,
> -                                O_RDWR | (flags & O_CLOEXEC));
> +                                O_RDWR | flags);

I'm strong against this.
Whenever a new flag is allowed this will explode...

>        if (error < 0)
>                ep_free(ep);
>
> --
> 1.7.3.4.600.g982838b0
>
> --
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-- 
Thanks,
//richard
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