linux-kernel - Re: [PATCH AUTOSEL 4.4 4/9] parisc: Provide an extru

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Message-ID: <46b2abb0-ee45-88de-c920-eab37df813f2@gmx.de>
Date:   Sat, 4 Dec 2021 15:57:06 +0100
From:   Helge Deller <deller@....de>
To:     Pavel Machek <pavel@...x.de>, Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        John David Anglin <dave.anglin@...l.net>,
        James.Bottomley@...senPartnership.com, svens@...ckframe.org,
        linux-parisc@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.4 4/9] parisc: Provide an extru_safe() macro to
 extract unsigned bits

On 12/4/21 13:15, Pavel Machek wrote:
> Hi!
>
>> From: Helge Deller <deller@....de>
>>
>> [ Upstream commit 169d1a4a2adb2c246396c56aa2f9eec3868546f1 ]
>>
>> The extru instruction leaves the most significant 32 bits of the
>> target register in an undefined state on PA 2.0 systems.
>> Provide a macro to safely use extru on 32- and 64-bit machines.
>
> As the macro is not used by subsequent 4.4 patches,

That's basically true, but in case we backport some patches later on,
it's handy if it's already in.

> I don't believe this is suitable for -stable.

Please note that I didn't added a backport-request in my original commit.
I'm fine with any decision if it's either dropped or kept.

Helge