Re: [GIT, RFC] Killing the Big Kernel Lock

[Arnd Bergmann <arnd@arndb.de>]

On Thursday 01 April 2010, Roland Dreier wrote:
> Looking at your tree, I see you have commit 753dd249 ("perf_event: use
> nonseekable_open") that does:
> 
>  > --- a/kernel/perf_event.c
>  > +++ b/kernel/perf_event.c
>  > @@ -2515,6 +2515,8 @@ static int perf_fasync(int fd, struct file *filp, int on)
>  >  }
>  >  
>  >  static const struct file_operations perf_fops = {
>  > +       .open                   = nonseekable_open,
>  > +       .llseek                 = no_llseek,
>  >         .release                = perf_release,
>  >         .read                   = perf_read,
>  >         .poll                   = perf_poll,
> 
> But if I understand this correctly, the assignment to .open is at best
> useless -- these file_operations are only used via anon_inode_getfd()
> and so there is no possible path that can call the .open method.  Or am
> I missing something?

You're right. I did not consider this.

	Arnd