Re: [PATCH] jffs2: Remove NULL checks from jffs2_destroy_slab_caches

[Salah Triki <salah.triki@acm.org>]

Hi,

It is not a copy paste of a cleanup patch by Julia Lawall. It is just a coincidence. In
addition, I think that, generaly, cleanups patchs are similar.

Best regards
--
Salah Triki

On Wed, Aug 05, 2015 at 10:32:47PM +0900, Sergey Senozhatsky wrote:
> 
> Hi,
> 
> Cc Julia Lawall
> 
> On (08/04/15 13:06), Brian Norris wrote:
> > On Tue, Aug 04, 2015 at 08:46:30PM +0100, Salah Triki wrote:
> > > kmem_cache_destroy can be called with NULL values. Thus, the checks that
> > > precede the calls are useless.
> > 
> > This isn't *currently* true. Only after a bit of work did I find that
> > this is queued to change in the next release -- akpm has a patch:
> > 
> > commit 3e54c0cd3abdca0cf91854278c8633fc7df6beb1
> > Author: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> > Date:   Thu Jul 30 09:55:36 2015 +1000
> > 
> >     mm/slab_common: allow NULL cache pointer in kmem_cache_destroy()
> > 
> > Please provide the appropriate context next time. And for the moment, I will
> > not apply this, because this does not work on the current MTD development tree.
> > Try your patch bomb on the next release, as it's not worth my time to
> > cross-merge a -next branch just for a "cleanup".
> > 
> 
> Julia already has a patch set to cleanup all the existing users
> (not published yet, though).
> 
> Apart from that, and this is more important, the patch in question
> looks to me as 100% copy paste of a patch by Julia Lawall.
> 
> https://lkml.org/lkml/2015/6/10/31
> 
> And no, Salah, it's not "Signed-off-by: Salah Triki <salah.triki@acm.org>".
> 
> For the record, this is the second, let's say strange, patch from Salah
> that I see today.
> 
> 	-ss
> 
> > > Signed-off-by: Salah Triki <salah.triki@acm.org>
> > > ---
> > >  fs/jffs2/malloc.c | 27 +++++++++------------------
> > >  1 file changed, 9 insertions(+), 18 deletions(-)
> > > 
> > > diff --git a/fs/jffs2/malloc.c b/fs/jffs2/malloc.c
> > > index b8fd651..ce11897 100644
> > > --- a/fs/jffs2/malloc.c
> > > +++ b/fs/jffs2/malloc.c
> > > @@ -97,25 +97,16 @@ int __init jffs2_create_slab_caches(void)
> > >  
> > >  void jffs2_destroy_slab_caches(void)
> > >  {
> > > -	if(full_dnode_slab)
> > > -		kmem_cache_destroy(full_dnode_slab);
> > > -	if(raw_dirent_slab)
> > > -		kmem_cache_destroy(raw_dirent_slab);
> > > -	if(raw_inode_slab)
> > > -		kmem_cache_destroy(raw_inode_slab);
> > > -	if(tmp_dnode_info_slab)
> > > -		kmem_cache_destroy(tmp_dnode_info_slab);
> > > -	if(raw_node_ref_slab)
> > > -		kmem_cache_destroy(raw_node_ref_slab);
> > > -	if(node_frag_slab)
> > > -		kmem_cache_destroy(node_frag_slab);
> > > -	if(inode_cache_slab)
> > > -		kmem_cache_destroy(inode_cache_slab);
> > > +	kmem_cache_destroy(full_dnode_slab);
> > > +	kmem_cache_destroy(raw_dirent_slab);
> > > +	kmem_cache_destroy(raw_inode_slab);
> > > +	kmem_cache_destroy(tmp_dnode_info_slab);
> > > +	kmem_cache_destroy(raw_node_ref_slab);
> > > +	kmem_cache_destroy(node_frag_slab);
> > > +	kmem_cache_destroy(inode_cache_slab);
> > >  #ifdef CONFIG_JFFS2_FS_XATTR
> > > -	if (xattr_datum_cache)
> > > -		kmem_cache_destroy(xattr_datum_cache);
> > > -	if (xattr_ref_cache)
> > > -		kmem_cache_destroy(xattr_ref_cache);
> > > +	kmem_cache_destroy(xattr_datum_cache);
> > > +	kmem_cache_destroy(xattr_ref_cache);
> > >  #endif
> > >  }
> > >  
> > > -- 
> > > 1.9.1
> > > 
> > > 
> > > ______________________________________________________
> > > Linux MTD discussion mailing list
> > > http://lists.infradead.org/mailman/listinfo/linux-mtd/
> >