linux-kernel - Re: [PATCH] sh-DWARF: Delete unnecessary checks before the function call "mempool

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Date:	Fri, 22 Jul 2016 11:31:11 -0400
From:	Rich Felker <dalias@...c.org>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	linux-sh@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH] sh-DWARF: Delete unnecessary checks before the function
 call "mempool_destroy"

On Tue, Jul 19, 2016 at 11:08:24PM +0200, SF Markus Elfring wrote:
> > From: Markus Elfring <elfring@...rs.sourceforge.net>
> > Date: Mon, 16 Nov 2015 08:20:36 +0100
> > 
> > The mempool_destroy() function tests whether its argument is NULL
> > and then returns immediately. Thus the test around the calls is not needed.
> > 
> > This issue was detected by using the Coccinelle software.
> > 
> > Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> > ---
> >  arch/sh/kernel/dwarf.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> > 
> > diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c
> > index 9d209a0..e1d751a 100644
> > --- a/arch/sh/kernel/dwarf.c
> > +++ b/arch/sh/kernel/dwarf.c
> > @@ -1009,10 +1009,8 @@ static void __init dwarf_unwinder_cleanup(void)
> >  	rbtree_postorder_for_each_entry_safe(cie, next_cie, &cie_root, node)
> >  		kfree(cie);
> >  
> > -	if (dwarf_reg_pool)
> > -		mempool_destroy(dwarf_reg_pool);
> > -	if (dwarf_frame_pool)
> > -		mempool_destroy(dwarf_frame_pool);
> > +	mempool_destroy(dwarf_reg_pool);
> > +	mempool_destroy(dwarf_frame_pool);
> >  	kmem_cache_destroy(dwarf_reg_cachep);
> >  	kmem_cache_destroy(dwarf_frame_cachep);
> >  }
> > 
> 
> Would you like to integrate this update suggestion
> into another source code repository?

Looks OK. I have it in my linux-sh tree to go upstream.

Rich