linux-kernel - RE: [Intel-wired-lan] [PATCH] ixgbe: Don't call kmap() on page allocated with GFP

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Date:   Thu, 4 Aug 2022 13:53:13 +0000
From:   "G, GurucharanX" <gurucharanx.g@...el.com>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "John Fastabend" <john.fastabend@...il.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
CC:     "Weiny, Ira" <ira.weiny@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH] ixgbe: Don't call kmap() on page
 allocated with GFP_ATOMIC



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Fabio M. De Francesco
> Sent: Monday, July 4, 2022 7:31 PM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>; David S. Miller <davem@...emloft.net>;
> Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>;
> Paolo Abeni <pabeni@...hat.com>; Alexei Starovoitov <ast@...nel.org>;
> Daniel Borkmann <daniel@...earbox.net>; Jesper Dangaard Brouer
> <hawk@...nel.org>; John Fastabend <john.fastabend@...il.com>; intel-
> wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; bpf@...r.kernel.org
> Cc: Weiny, Ira <ira.weiny@...el.com>; Fabio M. De Francesco
> <fmdefrancesco@...il.com>
> Subject: [Intel-wired-lan] [PATCH] ixgbe: Don't call kmap() on page allocated
> with GFP_ATOMIC
> 
> Pages allocated with GFP_ATOMIC cannot come from Highmem. This is why
> there is no need to call kmap() on them.
> 
> Therefore, don't call kmap() on rx_buffer->page() and instead use a plain
> page_address() to get the kernel address.
> 
> Suggested-by: Ira Weiny <ira.weiny@...el.com>
> Suggested-by: Alexander Duyck <alexander.duyck@...il.com>
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 

Tested-by: Gurucharan <gurucharanx.g@...el.com> (A Contingent worker at Intel)