lkml.org 
[lkml]   [2018]   [Jan]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] arch/cris: use get_user_pages_fast()
On Sun, Jan 21, 2018 at 02:59:29PM -0800, Davidlohr Bueso wrote:
> Since we currently hold mmap_sem across both gup calls (and
> nothing more), we can substitute it with two _fast()
> alternatives and possibly avoid grabbing the lock.
>
> This was found while adding mmap_sem wrappers, and was also
> previously reported by Al: https://lkml.org/lkml/2017/11/17/777

See commit 9a949e8ff92246c0753b2805c2a001cb991fffe5
Author: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat Nov 18 14:37:46 2017 -0500

cris: switch to get_user_pages_fast()

no point holding ->mmap_sem over both calls.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>


in -next...

\
 
 \ /
  Last update: 2018-01-22 00:40    [W:0.039 / U:0.328 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site