linux-kernel - Re: linux-next: build warning after merge of the kbuild tree

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Message-ID: <CAK7LNAT5iYa5NqJF=fmzmfG2HNA-w9Gc=8LCtXr+30Sx=NJisA@mail.gmail.com>
Date:   Mon, 23 Aug 2021 09:25:41 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the kbuild tree

On Fri, Aug 20, 2021 at 8:28 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> After merging the kbuild tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
>
> arch/x86/entry/vdso/Makefile:135: FORCE prerequisite is missing
> arch/x86/entry/vdso/Makefile:135: FORCE prerequisite is missing
> arch/x86/entry/vdso/Makefile:135: FORCE prerequisite is missing
>
> Exposed by commit
>
>   0fc7db58e2a6 ("kbuild: warn if FORCE is missing for if_changed(_dep,_rule) and filechk")
>
> Not sure why we need 3 of these :-(


This is a pattern rule, which generates
vdso64.so, vdso32.so, and vdsox32.so

The warning is produced as a side-effect
of the recipe. That is why 3 warnings.
Otherwise, I do not know how to implement it.


BTW, a fix for x86 Makefile exists in the patchwork.

https://lore.kernel.org/patchwork/patch/1478798/


-- 
Best Regards
Masahiro Yamada