linux-kernel - Re: [PATCH v12 07/31] mm: make pte_unmap

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Message-Id: <760693af-d180-8c9a-249d-bcf939d7f621@linux.ibm.com>
Date:   Tue, 23 Apr 2019 17:47:53 +0200
From:   Laurent Dufour <ldufour@...ux.ibm.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     akpm@...ux-foundation.org, mhocko@...nel.org, peterz@...radead.org,
        kirill@...temov.name, ak@...ux.intel.com, dave@...olabs.net,
        jack@...e.cz, aneesh.kumar@...ux.ibm.com, benh@...nel.crashing.org,
        mpe@...erman.id.au, paulus@...ba.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
        Will Deacon <will.deacon@....com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        sergey.senozhatsky.work@...il.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        David Rientjes <rientjes@...gle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Ganesh Mahendran <opensource.ganesh@...il.com>,
        Minchan Kim <minchan@...nel.org>,
        Punit Agrawal <punitagrawal@...il.com>,
        vinayak menon <vinayakm.list@...il.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        zhong jiang <zhongjiang@...wei.com>,
        Haiyan Song <haiyanx.song@...el.com>,
        Balbir Singh <bsingharora@...il.com>, sj38.park@...il.com,
        Michel Lespinasse <walken@...gle.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, npiggin@...il.com,
        paulmck@...ux.vnet.ibm.com, Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [PATCH v12 07/31] mm: make pte_unmap_same compatible with SPF

Le 23/04/2019 à 17:43, Matthew Wilcox a écrit :
> On Tue, Apr 16, 2019 at 03:44:58PM +0200, Laurent Dufour wrote:
>> +static inline vm_fault_t pte_unmap_same(struct vm_fault *vmf)
>>   {
>> -	int same = 1;
>> +	int ret = 0;
> 
> Surely 'ret' should be of type vm_fault_t?

Nice catch !

> 
>> +			ret = VM_FAULT_RETRY;
> 
> ... this should have thrown a sparse warning?

It should have, but I can't remember having see it, weird...