linux-kernel - Re: [PATCH v3] epoll: drop EPOLLWAKEUP if PM

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Date:	Fri, 15 Nov 2013 16:10:06 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Amit Pundir <amit.pundir@...aro.org>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	John Stultz <john.stultz@...aro.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH v3] epoll: drop EPOLLWAKEUP if PM_SLEEP is disabled

On Friday, November 15, 2013 12:56:31 PM Amit Pundir wrote:
> Drop EPOLLWAKEUP from epoll events mask if CONFIG_PM_SLEEP is disabled.
> 
> Signed-off-by: Amit Pundir <amit.pundir@...aro.org>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Or am I supposed to take care of this?

> ---
> Changes in v3:
>  Renamed ep_epollwakeup_check() to ep_take_care_of_epollwakeup().
>  Didn't update ep_create_wakeup_source() to return -ENOSYS if PM_SLEEP is unset.
> ---
>  fs/eventpoll.c                 |    3 +--
>  include/uapi/linux/eventpoll.h |   13 ++++++++++++-
>  2 files changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/eventpoll.c b/fs/eventpoll.c
> index 473e09d..dbf382b 100644
> --- a/fs/eventpoll.c
> +++ b/fs/eventpoll.c
> @@ -1820,8 +1820,7 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
>  		goto error_tgt_fput;
>  
>  	/* Check if EPOLLWAKEUP is allowed */
> -	if ((epds.events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
> -		epds.events &= ~EPOLLWAKEUP;
> +	ep_take_care_of_epollwakeup(&epds);
>  
>  	/*
>  	 * We have to check that the file structure underneath the file descriptor
> diff --git a/include/uapi/linux/eventpoll.h b/include/uapi/linux/eventpoll.h
> index 2c267bc..bc81fb2 100644
> --- a/include/uapi/linux/eventpoll.h
> +++ b/include/uapi/linux/eventpoll.h
> @@ -61,5 +61,16 @@ struct epoll_event {
>  	__u64 data;
>  } EPOLL_PACKED;
>  
> -
> +#ifdef CONFIG_PM_SLEEP
> +static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
> +{
> +	if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
> +		epev->events &= ~EPOLLWAKEUP;
> +}
> +#else
> +static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
> +{
> +	epev->events &= ~EPOLLWAKEUP;
> +}
> +#endif
>  #endif /* _UAPI_LINUX_EVENTPOLL_H */
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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