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

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Message-ID: <alpine.DEB.2.00.1205301801060.25774@chino.kir.corp.google.com>
Date:	Wed, 30 May 2012 18:02:59 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.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, 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.)
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