lkml.org 
[lkml]   [2014]   [Jan]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0/5] lockdep: (Was: check && lockdep_no_validate)
On 01/20, Alan Stern wrote:
>
> On Mon, 20 Jan 2014, Oleg Nesterov wrote:
>
> > On 01/17, Alan Stern wrote:
> > >
> > > Also, take a look at commit 356c05d58af0. It's a similar situation
> > > (not exactly the same).
> >
> > At first glance, can't __ATTR_IGNORE_LOCKDEP() use no_validate too ?
> > (ignoring the fact checkpatch.pl won't be happy). This can simplify
> > the code, it seems.
>
> Well, the macro itself doesn't specify the lockdep class. That happens
> implicitly in sysfs_get_active(), in the call to rwsem_acquire_read().
> However, it ought to be possible to change the code so that when
> ignore_lockdep(sd) returns nonzero, we end up using no_validate.

sysfs_dirent_init_lockdep() can check ->ignore_lockdep and do
lockdep_set_novalidate_class(). This way sysfs_ignore_lockdep() can
go away.

I guess we could even change __ATTR_IGNORE_LOCKDEP() to initialize
->key = __lockdep_no_validate__ and kill ->ignore_lockdep.

Oleg.



\
 
 \ /
  Last update: 2014-01-20 20:42    [W:0.129 / U:1.852 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site