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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 17 Aug 2020 09:44:45 -0700
Message-ID: <CAHk-=wgOaEmFGYhnx7XLe8AbQKYpgMAzyuHuS8dYZoB2hS3C=A@mail.gmail.com>
Subject: Re: ..build stopped... Linux 5.9-rc1
To:     Bhaskar Chowdhury <unixbhaskar@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Sun, Aug 16, 2020 at 3:58 PM Bhaskar Chowdhury <unixbhaskar@gmail.com> w=
rote:
>
> I am scared that I might have missed something very obvious ...am I?? And=
 the build abort...take a peek..
>
> ./arch/x86/include/asm/io.h:292:2: error: implicit declaration of functio=
n =E2=80=98slow_down_io=E2=80=99 [-Werror=3Dimplicit-function-declaration]

I'm not seeing how that would happen with a pristine codebase, but
send me your config just in case.

slow_down_io() is declared not that much further up in that file (or
in paravirt.h that gets included before for the CONFIG_PARAVIRT case).

             Linus