Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To:     Eric Biederman <ebiederm@xmission.com>, kexec@lists.infradead.org,
        linux-kernel@vger.kernel.org
Cc:     Ira Weiny <ira.weiny@intel.com>
Subject: Re: [PATCH] kexec: Replace kmap() with kmap_local_page()
Date:   Fri, 08 Jul 2022 01:40:14 +0200
Message-ID: <4410443.LvFx2qVVIh@opensuse>
In-Reply-To: <20220707184939.6086-1-fmdefrancesco@gmail.com>
References: <20220707184939.6086-1-fmdefrancesco@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="utf-8"
Precedence: bulk

On gioved=C3=AC 7 luglio 2022 20:49:39 CEST Fabio M. De Francesco wrote:
> The use of kmap() and kmap_atomic() are being deprecated in favor of
> kmap_local_page().
>=20
> With kmap_local_page(), the mappings are per thread, CPU local and not
> globally visible. Furthermore, the mappings can be acquired from any
> context (including interrupts).
>=20
> Therefore, use kmap_local_page() in aio.c because these mappings are per
> thread, CPU local, and not globally visible.
>=20
> Tested on a QEMU + KVM 32-bits VM booting a kernel with HIGHMEM64GB
> enabled.
>=20
> Suggested-by: Ira Weiny <ira.weiny@intel.com>
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
> ---
>  kernel/kexec_core.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
Please discard this version because there is a small error in the commit=20
message due to bad copy and paste. Version 2 is at=20
https://lore.kernel.org/lkml/20220707231550.1484-1-fmdefrancesco@gmail.com/

Thanks,

=46abio