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

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Date:	Wed, 12 Jan 2011 08:54:41 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
cc:	Namhyung Kim <namhyung@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] epoll: remove unnecessary bit operation in epoll_create1
 syscall

On Wed, 12 Jan 2011, richard -rw- weinberger wrote:

> 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...

His point might be that there is a check right ahead, so flags can't be 
enything outside such mask.
But yeah, this is not worth creating another couple of objects in the GIT 
tree IMO.



- Davide