linux-kernel - Re: [PATCH v6 22/24] mm: Speculative page fault handler return VMA

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Date:   Fri, 12 Jan 2018 11:02:51 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        akpm@...ux-foundation.org, kirill@...temov.name,
        ak@...ux.intel.com, mhocko@...nel.org, dave@...olabs.net,
        jack@...e.cz, 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>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        kemi.wang@...el.com, sergey.senozhatsky.work@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [PATCH v6 22/24] mm: Speculative page fault handler return VMA

On Fri, Jan 12, 2018 at 06:26:06PM +0100, Laurent Dufour wrote:
> @@ -1354,7 +1354,10 @@ extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
>  		unsigned int flags);
>  #ifdef CONFIG_SPF
>  extern int handle_speculative_fault(struct mm_struct *mm,
> +				    unsigned long address, unsigned int flags,
> +				    struct vm_area_struct **vma);

I think this shows that we need to create 'struct vm_fault' on the stack
in the arch code and then pass it to handle_speculative_fault(), followed
by handle_mm_fault().  That should be quite a nice cleanup actually.
I know that's only 30+ architectures to change ;-)