lkml.org 
[lkml]   [2018]   [Aug]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] mm: Use special value SHRINKER_REGISTERING instead list_empty() check
On Sun, Aug 05, 2018 at 08:30:43AM +0300, Kirill Tkhai wrote:
> On 05.08.2018 03:03, Matthew Wilcox wrote:
> > On Sat, Aug 04, 2018 at 09:42:05PM +0300, Kirill Tkhai wrote:
> >> This is exactly the thing the patch makes. Instead of inserting a shrinker pointer
> >> to idr, it inserts a fake value SHRINKER_REGISTERING there. The patch makes impossible
> >> to dereference a shrinker unless it's completely registered.
> >
> > - id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL);
> > + id = idr_alloc(&shrinker_idr, SHRINKER_REGISTERING, 0, 0, GFP_KERNEL);
> >
> > Instead:
> >
> > + id = idr_alloc(&shrinker_idr, NULL, 0, 0, GFP_KERNEL);
> >
> > ... and the rest of your patch becomes even simpler.
>
> The patch, we are discussing at the moment, does *exactly* this:
>
> https://lkml.org/lkml/2018/8/3/588
>
> It looks like you missed this hunk in the patch.

No, it does this:

+ id = idr_alloc(&shrinker_idr, SHRINKER_REGISTERING, 0, 0, GFP_KERNEL);

I'm saying do this:

+ id = idr_alloc(&shrinker_idr, NULL, 0, 0, GFP_KERNEL);

\
 
 \ /
  Last update: 2018-08-05 14:51    [W:0.063 / U:0.452 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site