Re: [Customers.Eckelmann] [PATCH] locking/rwsem: Fix up_read_non_owner() warning with DEBUG_RWSEMS

[Schenk, Gavin]

Hi,

On Wed, 2018-06-20 at 07:09 +0800, Waiman Long wrote:
> On 05/24/2018 09:26 PM, Waiman Long wrote:
> > It was found that the use of up_read_non_owner() in NFS was causing
> > the following warning when DEBUG_RWSEMS was configured.
> > 
> >   DEBUG_LOCKS_WARN_ON(sem->owner != ((struct task_struct *)(1UL << 0)))
> > 
> > Looking into the rwsem.c file, it was discovered that the corresponding
> > down_read_non_owner() function was not setting the owner field properly.
> > This is fixed now, and the warning should be gone.
> > 
> > Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
Tested-by: Gavin Schenk <g.schenk@xxxxxxxxxxxx>

This fixes my reproducible locking splat when booting with nfsroot and changing password. Thank you!

Regards
Gavin Schenk