linux-kernel - Re: [PATCH v2 4/4] xen/netback: fix grant copy across page boundary

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Date:   Wed, 22 Jan 2020 10:07:35 +0000
From:   Sergey Dyasli <sergey.dyasli@...rix.com>
To:     Paul Durrant <pdurrant@...il.com>
CC:     <xen-devel@...ts.xen.org>, <kasan-dev@...glegroups.com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        "Dmitry Vyukov" <dvyukov@...gle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        George Dunlap <george.dunlap@...rix.com>,
        Ross Lagerwall <ross.lagerwall@...rix.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Wei Liu" <wei.liu@...nel.org>,
        "sergey.dyasli@...rix.com >> Sergey Dyasli" 
        <sergey.dyasli@...rix.com>
Subject: Re: [PATCH v2 4/4] xen/netback: fix grant copy across page boundary

On 20/01/2020 08:58, Paul Durrant wrote:
> On Fri, 17 Jan 2020 at 12:59, Sergey Dyasli <sergey.dyasli@...rix.com> wrote:
>>
>> From: Ross Lagerwall <ross.lagerwall@...rix.com>
>>
>> When KASAN (or SLUB_DEBUG) is turned on, there is a higher chance that
>> non-power-of-two allocations are not aligned to the next power of 2 of
>> the size. Therefore, handle grant copies that cross page boundaries.
>>
>> Signed-off-by: Ross Lagerwall <ross.lagerwall@...rix.com>
>> Signed-off-by: Sergey Dyasli <sergey.dyasli@...rix.com>
>> ---
>> v1 --> v2:
>> - Use sizeof_field(struct sk_buff, cb)) instead of magic number 48
>> - Slightly update commit message
>>
>> RFC --> v1:
>> - Added BUILD_BUG_ON to the netback patch
>> - xenvif_idx_release() now located outside the loop
>>
>> CC: Wei Liu <wei.liu@...nel.org>
>> CC: Paul Durrant <paul@....org>
>
> Acked-by: Paul Durrant <paul@....org>

Thanks! I believe this patch can go in independently from the other
patches in the series. What else is required for this?

--
Sergey