linux-kernel - Re: [PATCH -V7 02/14] hugetlbfs: don't use ERR_PTR with VM

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Message-ID: <20120531054533.GE24855@skywalker.linux.vnet.ibm.com>
Date:	Thu, 31 May 2012 11:15:33 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-mm@...ck.org, kamezawa.hiroyu@...fujitsu.com,
	dhillf@...il.com, mhocko@...e.cz, akpm@...ux-foundation.org,
	hannes@...xchg.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH -V7 02/14] hugetlbfs: don't use ERR_PTR with VM_FAULT*
 values

On Wed, May 30, 2012 at 06:02:59PM -0700, David Rientjes wrote:
> On Wed, 30 May 2012, Aneesh Kumar K.V wrote:
> 
> > From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> > 
> > The current use of VM_FAULT_* codes with ERR_PTR requires us to ensure
> > VM_FAULT_* values will not exceed MAX_ERRNO value.  Decouple the
> > VM_FAULT_* values from MAX_ERRNO.
> > 
> 
> Yeah, but is there a reason for using VM_FAULT_HWPOISON_LARGE_MASK since 
> that's the only VM_FAULT_* value that is greater than MAX_ERRNO?  The rest 
> of your patch set doesn't require this, so I think this change should just 
> be dropped.  (And PTR_ERR() still returns long, this wasn't fixed from my 
> original review.)
> 

The changes was done as per Andrew's request so that we don't have such hidden
dependencies on the values of VM_FAULT_*. Yes it can be a seperate patch from
the patchset. I have changed int to long as per your review.

-aneesh

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