[lkml]   [2018]   [May]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] locking/rwsem: Add up_write_non_owner() for percpu_up_write()
On 04/09/2018 10:22 AM, Oleg Nesterov wrote:
> On 04/09, Waiman Long wrote:
>> On 04/09/2018 07:20 AM, Oleg Nesterov wrote:
>>> Hmm. Can you look at lockdep_sb_freeze_release() and lockdep_sb_freeze_acquire()?
>> These 2 functions are there to deal with the lockdep code.
> Plus they clearly document why sem->owner check is not right when it comes
> to super_block->s_writers[]. Not only freeze and thaw can be called by
> different processes, we need to return to user-space with rwsem held for
> writing.

Sorry for the late reply as I was busy on other work.

I have just sent out a v2 patch to hopefully address your concern.
Please let me know your thought on that.


 \ /
  Last update: 2018-05-14 21:37    [W:0.069 / U:1.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site