linux-kernel - Re: jump_label: move 'asm goto' support test to Kconfig

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Date:   Wed, 2 Jan 2019 13:14:18 +0100
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     masahiroy@...nel.org
Cc:     linux-kbuild@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Max Filippov <jcmvbkbc@...il.com>, linux-arch@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: jump_label: move 'asm goto' support test to Kconfig

Hi,

I was not aware that CONFIG_JUMP_LABEL Kconfig setting depends on the
support of asm-goto.

Currently, I am doing experiments with clang-7 and a snapshot of
clang-8 on Linux/x86.
These compilers have no asm-goto support.

What is your recommendation for Linux >= v4.20?
I am asking as it is possible to set CONFIG_JUMP_LABEL=y when
compiling with clang - which has no effect.
This is confusing.

Thanks, this patch makes things clearer and protects users from
setting "wrong" in the sense of non-functional settings.

I have tested this against recent Linus tree where kbuild/kconfig Git
pulls were latest commits.

Tested-by: Sedat Dilek <sedat.dilek@...il.com> [ x86 with LLVM/Clang
v7 and v8 (snapshot) ]

Thanks.

Regards,
- Sedat -