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

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Message-ID: <CACCGGhApXXnQwfBN_LioAh+8bk-cAAQ2ciua-MnnQoMBUfap6g@mail.gmail.com>
Date:   Mon, 20 Jan 2020 08:58:02 +0000
From:   Paul Durrant <pdurrant@...il.com>
To:     Sergey Dyasli <sergey.dyasli@...rix.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>
Subject: Re: [PATCH v2 4/4] xen/netback: fix grant copy across page boundary

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>