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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 01:50:35 +0200
Message-ID: <3183776.44csPzL39Z@opensuse>
In-Reply-To: <20220707231412.1404-1-fmdefrancesco@gmail.com>
References: <20220707231412.1404-1-fmdefrancesco@gmail.com>
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On venerd=C3=AC 8 luglio 2022 01:14:12 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 kexec_core.c because these mappings=20
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>
> ---
>=20
> v1->v2: A sentence of the commit message contained an error due to a
> mistake in copy-pasting from a previous patch. Replace "aio.c" with
> "kexec_core.c".
>=20
>  kernel/kexec_core.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>=20
Sorry, another error... Please discard this patch because the version=20
number is missing in the subject.

The second version, hopefully final and correct, is at
https://lore.kernel.org/lkml/20220707231550.1484-1-fmdefrancesco@gmail.com/

Thank you,

=46abio