Re: [PATCH linux-next] perf/ring_buffer: Add EPOLLRDNORM flag for poll

[Ingo Molnar]

* Tao Chen <chen.dylane@xxxxxxxxx> wrote:

> The poll man page says POLLRDNORM is equivalent to POLLIN,
> so add EPOLLRDNORM here.
> 
> Signed-off-by: Tao Chen <chen.dylane@xxxxxxxxx>
> ---
>  kernel/events/ring_buffer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
> index 59a52b1a1..5130b119d 100644
> --- a/kernel/events/ring_buffer.c
> +++ b/kernel/events/ring_buffer.c
> @@ -19,7 +19,7 @@
>  
>  static void perf_output_wakeup(struct perf_output_handle *handle)
>  {
> -	atomic_set(&handle->rb->poll, EPOLLIN);
> +	atomic_set(&handle->rb->poll, EPOLLIN | EPOLLRDNORM);

So what does EPOLLRDNORM mean to begin with? There doesn't seem to be 
separate/specific handling of it anywhere in the kernel that I can 
see...

Thanks,

	Ingo