Re: [PATCH] kexec: Replace kmap() with kmap_local_page()

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	[thread overview]
Message-ID: <3183776.44csPzL39Z@opensuse> (raw)
In-Reply-To: <20220707231412.1404-1-fmdefrancesco@gmail.com>

On venerdì 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().
> 
> 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).
> 
> Therefore, use kmap_local_page() in kexec_core.c because these mappings 
are
> per thread, CPU local, and not globally visible.
> 
> Tested on a QEMU + KVM 32-bits VM booting a kernel with HIGHMEM64GB
> enabled.
> 
> Suggested-by: Ira Weiny <ira.weiny@intel.com>
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
> ---
> 
> 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".
> 
>  kernel/kexec_core.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
Sorry, another error... Please discard this patch because the version 
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,

Fabio

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