linux-kernel - Re: [RFC v3 PATCH 3/5] mm: refactor do_munmap() to extract the common part

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Message-ID: <20180702175835.GH19043@dhcp22.suse.cz>
Date:   Mon, 2 Jul 2018 19:58:35 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     willy@...radead.org, ldufour@...ux.vnet.ibm.com,
        akpm@...ux-foundation.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, tglx@...utronix.de,
        hpa@...or.com, linux-mm@...ck.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v3 PATCH 3/5] mm: refactor do_munmap() to extract the
 common part

On Mon 02-07-18 09:59:06, Yang Shi wrote:
> 
> 
> On 7/2/18 6:42 AM, Michal Hocko wrote:
> > On Sat 30-06-18 06:39:43, Yang Shi wrote:
> > > Introduces two new helper functions:
> > >    * munmap_addr_sanity()
> > >    * munmap_lookup_vma()
> > > 
> > > They will be used by do_munmap() and the new do_munmap with zapping
> > > large mapping early in the later patch.
> > > 
> > > There is no functional change, just code refactor.
> > There are whitespace changes which make the code much harder to review
> > than necessary.
> > > +static inline bool munmap_addr_sanity(unsigned long start, size_t len)
> > >   {
> > > -	unsigned long end;
> > > -	struct vm_area_struct *vma, *prev, *last;
> > > +	if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE - start)
> > > +		return false;
> > > -	if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start)
> > > -		return -EINVAL;
> > e.g. here.
> 
> Oh, yes. I did some coding style cleanup too.

If you want to do some coding style cleanups make them a separate patch.
The resulting diff would be much easier to review.

-- 
Michal Hocko
SUSE Labs