linux-kernel - RE: [PATCH] kbuild: Fix <linux/version.h> for empty SUBLEVEL or PATCHLEVEL again

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Date:   Mon, 1 Mar 2021 17:10:39 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Masahiro Yamada' <masahiroy@...nel.org>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Christian Zigotzky <chzigotzky@...osoft.de>
CC:     Sasha Levin <sashal@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] kbuild: Fix <linux/version.h> for empty SUBLEVEL or
 PATCHLEVEL again

From: Masahiro Yamada
> Sent: 27 February 2021 14:20
> 
> Commit 9b82f13e7ef3 ("kbuild: clamp SUBLEVEL to 255") breaks the build
> if SUBLEVEL or PATCHLEVEL is empty.
> 
> Commit 78d3bb4483ba ("kbuild: Fix <linux/version.h> for empty SUBLEVEL
> or PATCHLEVEL") fixed the issue by prepending a zero.
> 
> This time, we cannot take the same approach because we have C code:
> 
>   #define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL)
>   #define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
> 
> Replace empty SUBLEVEL or PATCHLEVEL with a zero.

You could do:

#define LINUX_VERSION_PATCHLEVEL ($(PATCHLEVEL) + 0)

	David

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