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

[Josh Triplett]

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@xxxxxxxxxxx>
> Cc: Jeff Dike <jdike@xxxxxxxxxxx>
> Cc: Richard Weinberger <richard@xxxxxx>
> Cc: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
> Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> Cc: Michal Marek <mmarek@xxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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?

>  arch/x86/um/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
> index a8fecc226946..3ee2bb6b440b 100644
> --- a/arch/x86/um/Makefile
> +++ b/arch/x86/um/Makefile
> @@ -17,7 +17,7 @@ obj-y = bug.o bugs_$(BITS).o delay.o fault.o ksyms.o ldt.o \
>  ifeq ($(CONFIG_X86_32),y)
>  
>  obj-y += checksum_32.o
> -obj-$(CONFIG_BINFMT_ELF) += elfcore.o
> +obj-$(CONFIG_ELF_CORE) += elfcore.o
>  
>  subarch-y = ../lib/string_32.o ../lib/atomic64_32.o ../lib/atomic64_cx8_32.o
>  subarch-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += ../lib/rwsem.o
> -- 
> 2.6.4
> 
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