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

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Date:   Sat, 6 Feb 2021 13:53:04 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     masahiroy@...nel.org, michal.lkml@...kovi.net,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.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>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>