linux-kernel - Re: [PATCH 3/3] kbuild: introduce KERNEL_VERSION2 and LINUX_VERSION

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Message-ID: <20210206040159.GW4035784@sasha-vm>
Date:   Fri, 5 Feb 2021 23:01:59 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     masahiroy@...nel.org, michal.lkml@...kovi.net
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        stable@...nel.org
Subject: Re: [PATCH 3/3] kbuild: introduce KERNEL_VERSION2 and
 LINUX_VERSION_CODE2

On Fri, Feb 05, 2021 at 10:50:33PM -0500, Sasha Levin wrote:
>SUBLEVEL only has 8 bits of space, which means that we'll overflow it
>once it reaches 256.
>
>Few of the stable branches will imminently overflow SUBLEVEL while
>there's no risk of overflowing VERSION.
>
>Thus, give SUBLEVEL 8 more bits which will be stolen from VERSION, this
>should create a better balance between the different version numbers we
>use.
>
>We can't however use the original KERNEL_VERSION and LINUX_VERSION_CODE
>as userspace has created ABI dependency on their structure, and we risk
>breaking this userspace by modifying the layout of the version integers.
>
>Cc: stable@...nel.org
>Signed-off-by: Sasha Levin <sashal@...nel.org>
>Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

I wanted to re-use an older commit but forgot to drop the two tags
above. The tags from Masahiro and Greg shouldn't be here, sorry about
that.

-- 
Thanks,
Sasha