linux-kernel - Re: [PATCH v2] um: Fix build error and kconfig for i386

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Date:	Wed, 23 Dec 2015 13:42:12 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Mickaël Salaün <mic@...ikod.net>
Cc:	linux-kernel@...r.kernel.org, Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	user-mode-linux-devel@...ts.sourceforge.net,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Michal Marek <mmarek@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH v2] um: Fix build error and kconfig for i386

On Wed, Dec 23, 2015 at 01:59:13PM +0100, Mickaël Salaün wrote:
> Fix build error by selecting COREDUMP when X86_32 is selected:
> 
> arch/x86/um/built-in.o: In function `elf_core_write_extra_phdrs':
> (.text+0x3e62): undefined reference to `dump_emit'
> arch/x86/um/built-in.o: In function `elf_core_write_extra_data':
> (.text+0x3eef): undefined reference to `dump_emit'
> 
> Fixes: 5d2acfc7b974 ("kconfig: make allnoconfig disable options behind EMBEDDED and EXPERT")
> Signed-off-by: Mickaël Salaün <mic@...ikod.net>
> Cc: Jeff Dike <jdike@...toit.com>
> Cc: Richard Weinberger <richard@....at>
> Cc: Josh Triplett <josh@...htriplett.org>
> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Cc: Michal Marek <mmarek@...e.cz>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>

I suppose um doesn't care deeply about binary size, but ideally I would
suggest changing arch/x86/um/Makefile to make elfcore.c compiled in when
CONFIG_ELF_CORE rather than CONFIG_BINFMT_ELF.

>  arch/x86/um/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
> index ed56a1c4ae73..bb7cd8b38043 100644
> --- a/arch/x86/um/Kconfig
> +++ b/arch/x86/um/Kconfig
> @@ -26,6 +26,7 @@ config X86_32
>  	select CLONE_BACKWARDS
>  	select OLD_SIGSUSPEND3
>  	select OLD_SIGACTION
> +	select COREDUMP
>  
>  config X86_64
>  	def_bool 64BIT
> -- 
> 2.6.4
> 
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