linux-kernel - Re: [PATCH v3] um: Fix build error and kconfig for i386

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Date:	Fri, 25 Dec 2015 20:10:01 -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 v3] um: Fix build error and kconfig for i386

On Fri, Dec 25, 2015 at 07:45:41PM +0100, Mickaël Salaün wrote:
> 
> On 25/12/2015 02:34, Josh Triplett wrote:
> > On Thu, Dec 24, 2015 at 01:12:11PM +0100, Mickaël Salaün wrote:
> >> Fix build error by generating elfcore.o only when ELF_CORE (depending on
> >> COREDUMP) 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>
> > 
> > It looks like ELF_CORE depends on COREDUMP, but not on BINFMT_ELF.
> > Should it?  What happens if you build this with ELF_CORE=y and
> > BINFMT_ELF=n?  Does that configuration even make sense?
> 
> It build fine with ELF_CORE=y and BINFMT_ELF=n but does not seem
> useful. Nevertheless, it's the same for all architectures (cf.
> init/Kconfig): ELF_CORE only depends on COREDUMP.

As long as that builds, then this patch doesn't introduce an
un-buildable Kconfig configuration, so it seems reasonable.  Thanks
again for producing a new version.

Reviewed-by: Josh Triplett <josh@...htriplett.org>
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