Re: [PATCH 4.19 29/32] jump_label: move asm goto support test to Kconfig
From: Pavel Machek
Date: Tue Jun 04 2019 - 05:34:29 EST
On Mon 2019-06-03 11:08:23, Greg Kroah-Hartman wrote:
> From: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> 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
> 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@xxxxxxxxxxxxx>
> Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> (powerpc)
> Tested-by: Sedat Dilek <sedat.dilek@xxxxxxxxx>
> [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
> Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
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
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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