linux-kernel - Re: [PATCH 4.19 29/32] jump_label: move asm goto support test to Kconfig

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Date:   Tue, 4 Jun 2019 11:30:32 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH 4.19 29/32] jump_label: move asm goto support test to
 Kconfig

On Mon 2019-06-03 11:08:23, Greg Kroah-Hartman wrote:
> From: Masahiro Yamada <yamada.masahiro@...ionext.com>
> 
> commit e9666d10a5677a494260d60d1fa0b73cc7646eb3 upstream.
> 
> Currently, CONFIG_JUMP_LABEL just means "I _want_ to use jump label".
> 
> The jump label is controlled by HAVE_JUMP_LABEL, which is defined
> like this:
> 
>   #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
>   # define HAVE_JUMP_LABEL
>   #endif
> 
> We can improve this by testing 'asm goto' support in Kconfig, then
> make JUMP_LABEL depend on CC_HAS_ASM_GOTO.
> 
> Ugly #ifdef HAVE_JUMP_LABEL will go away, and CONFIG_JUMP_LABEL will
> match to the real kernel capability.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)
> Tested-by: Sedat Dilek <sedat.dilek@...il.com>
> [nc: Fix trivial conflicts in 4.19
>      arch/xtensa/kernel/jump_label.c doesn't exist yet
>      Ensured CC_HAVE_ASM_GOTO and HAVE_JUMP_LABEL were sufficiently
>      eliminated]
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This does not matche stable-kernel rules. It is nice cleanup, but it
does not really fix any bug (does it?), and resulting patch is too
big.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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