linux-kernel - RE: [PATCH] kbuild: give SUBLEVEL more room in KERNEL

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Date:   Mon, 18 Jan 2021 22:54:38 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Masahiro Yamada' <masahiroy@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>
CC:     Sasha Levin <sashal@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "stable@...nel.org" <stable@...nel.org>
Subject: RE: [PATCH] kbuild: give SUBLEVEL more room in KERNEL_VERSION

From: Masahiro Yamada
> Sent: 18 January 2021 10:28
...
> It helps external modules to be compiled for multiple kernel versions.
> 
> #if KERNEL_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
>     code for the kernel versions older than 5.4.0
> #endif

I've just done a scan through some drivers.
The only checks with a non-zero sub-rev are for 2.6.nnn.
So provided KERNEL_VERSION_CODE is changed to match
nothing of ours breaks.

I've only found tests for the following:
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 32)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 7, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 8, 0)

Although some seem to be against VERSION_CODE()
rather than KERNEL_VERSION().

	David

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