linux-kernel - Re: [PATCH]: cross-compiling x86_64 kernel on i386 user-space fails

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Date:	Sun, 23 Nov 2014 20:27:24 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Borislav Petkov <bp@...en8.de>
cc:	Chris Clayton <chris2553@...glemail.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Junjie Mao <eternal.n08@...il.com>,
	Kees Cook <keescook@...omium.org>, x86-ml <x86@...nel.org>
Subject: Re: [PATCH]: cross-compiling x86_64 kernel on i386 user-space
 fails

On Sat, 22 Nov 2014, Borislav Petkov wrote:

> On Sat, Nov 22, 2014 at 09:51:10AM +0000, Chris Clayton wrote:
> > Hi,
> 
> Yeah, next time make sure you actually CC people :-)
> 
> I've added them to CC now.
> 
> > Commit e6023367d779060fddc9a52d1f474085b2b36298 broke building an x86_64 kernel in an i386. The change added a call to
> > objdump but neglected to cater for cross-compiling.
> > 
> > The patch below fixes the problem for me. I see the commit is now in 3.14 and 3.17 -stable, so the patch needs to go
> > there too.

That's not a specific problem of building x86_64 on i386. The missing
cross compile prefix prevents any cross build of x86.

> CC: stable@...r.kernel.org
> 
> in the commit message should help there.
> 
> 
> > CC: Junjie Mao <eternal.n08@...il.com>
> > CC: Kees Cook <keescook@...omium.org>
> > CC: Thomas Gleixner <tglx@...utronix.de>
> > CC: Ingo Molnar <mingo@...nel.org>
> > Signed-off-by: Chris Clayton <chris2553@...glemail.com>
> 
> Acked-by: Borislav Petkov <bp@...e.de>
> 
> > ---
> > --- linux/arch/x86/boot/compressed/Makefile~    2014-11-22 08:56:50.359706324 +0000
> > +++ linux/arch/x86/boot/compressed/Makefile     2014-11-22 09:04:06.615693435 +0000
> > @@ -76,7 +76,7 @@ suffix-$(CONFIG_KERNEL_XZ)    := xz
> >  suffix-$(CONFIG_KERNEL_LZO)    := lzo
> >  suffix-$(CONFIG_KERNEL_LZ4)    := lz4
> > 
> > -RUN_SIZE = $(shell objdump -h vmlinux | \
> > +RUN_SIZE = $(shell ${CROSS_COMPILE}objdump -h vmlinux | \

While that works, this wants to be:

+RUN_SIZE = $(shell $(OBJDUMP) -h vmlinux | \

I'll fix it up.

Thanks,

	tglx
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