linux-kernel - Re: [PATCH 03/10] mm: convert i_mmap

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Date:	Tue, 28 Oct 2014 13:27:19 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	akpm@...ux-foundation.org, hughd@...gle.com, riel@...hat.com,
	mgorman@...e.de, peterz@...radead.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 03/10] mm: convert i_mmap_mutex to rwsem

On Sat, 2014-10-25 at 01:45 +0300, Kirill A. Shutemov wrote:
> On Fri, Oct 24, 2014 at 03:06:13PM -0700, Davidlohr Bueso wrote:
> > diff --git a/mm/fremap.c b/mm/fremap.c
> > index 72b8fa3..11ef7ec 100644
> > --- a/mm/fremap.c
> > +++ b/mm/fremap.c
> > @@ -238,13 +238,13 @@ get_write_lock:
> >  			}
> >  			goto out_freed;
> >  		}
> > -		mutex_lock(&mapping->i_mmap_mutex);
> > +		i_mmap_lock_write(mapping);
> >  		flush_dcache_mmap_lock(mapping);
> >  		vma->vm_flags |= VM_NONLINEAR;
> >  		vma_interval_tree_remove(vma, &mapping->i_mmap);
> >  		vma_nonlinear_insert(vma, &mapping->i_mmap_nonlinear);
> >  		flush_dcache_mmap_unlock(mapping);
> > -		mutex_unlock(&mapping->i_mmap_mutex);
> > +		i_mmap_unlock_write(mapping);
> >  	}
> >  
> >  	if (vma->vm_flags & VM_LOCKED) {
> 
> This should go to previous patch.

Indeed. I had forgotten I snuck that change in as when I was writing the
patch there was a conflict with that fremap. However you removed
mm/fremap.c altogether in -next (mm: replace remap_file_pages() syscall
with emulation) so I'll just update accordingly.

Thanks,
Davidlohr

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