linux-kernel - Re: [PATCH] arch/x86/realmode: make trampoline code conditional for x86-32

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Date:	Thu, 16 Oct 2014 08:59:20 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arch/x86/realmode: make trampoline code conditional for
 x86-32

On Wed, Oct 15, 2014 at 08:47:11AM -0700, H. Peter Anvin wrote:
> On 10/15/2014 08:38 AM, Jarkko Sakkinen wrote:
> > Trampoline code is only needed for SMP and in x86-64 for wakeup
> > code. Make it conditional in order to minimize the kernel size.
> > 
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > ---
> >  arch/x86/realmode/rm/Makefile | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/arch/x86/realmode/rm/Makefile b/arch/x86/realmode/rm/Makefile
> > index 7c0d7be..82b7312 100644
> > --- a/arch/x86/realmode/rm/Makefile
> > +++ b/arch/x86/realmode/rm/Makefile
> > @@ -20,7 +20,11 @@ wakeup-objs	+= video-vesa.o
> >  wakeup-objs	+= video-bios.o
> >  
> >  realmode-y			+= header.o
> > +ifdef CONFIG_X86_64
> >  realmode-y			+= trampoline_$(BITS).o
> > +else
> > +realmode-$(CONFIG_SMP)		+= trampoline_$(BITS).o
> > +endif
> >  realmode-y			+= stack.o
> >  realmode-y			+= reboot.o
> >  realmode-$(CONFIG_ACPI_SLEEP)	+= $(wakeup-objs)
> > 
> 
> It is usually preferred to make this a hidden config option (e.g.
> CONFIG_X86_TRAMPOLINE) rather than use ifdef, especially since your
> ifdef has another conditional inside it.

OK, I'll revise the patch, thanks.

> 	-hpa

/Jarkko
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