linux-kernel - Re: [tip:x86/mm] x86: Work around old gas bug

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Date:	Thu, 3 Mar 2011 10:35:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	Shaohua Li <shaohua.li@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>
Subject: Re: [tip:x86/mm] x86: Work around old gas bug


* Jan Beulich <JBeulich@...ell.com> wrote:

> >>> On 03.03.11 at 06:35, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > On Thu, 03 Mar 2011 13:27:05 +0800 Shaohua Li <shaohua.li@...el.com> wrote:
> > 
> >> On Thu, 2011-03-03 at 00:24 +0800, Andrew Morton wrote:
> >> > On Wed, 2 Mar 2011 11:41:44 +0100 Ingo Molnar <mingo@...e.hu> wrote:
> >> > 
> >> > > Meanwhile, what i hate more than ugly code repetition is code that does 
> > not build at 
> >> > > all on akpm's test environment ;-)
> >> > 
> >> > I hadn't got around to testing it.  Bad news :(
> >> > 
> >> Andrew,
> >> can you this on your side? this is what Jan proposed. I can only test a
> >> latest binutils here.
> > 
> > Nope.
> > 
> > arch/x86/kernel/entry_64.S: Assembler messages:
> > arch/x86/kernel/entry_64.S:985: Error: too many positional arguments
> 
> Indeed - the problem isn't with the actual assembly construct, but
> rather with the changed definitions of *INVALIDATE_TLB_VECTOR* -
> properly parenthesizing them (as we needed to do in other places)
> and removing unnecessary spaces gets this to build for me, even 
> with the original use of .irp instead of .irpc:
> 
> #if NR_CPUS <= 32
> # define NUM_INVALIDATE_TLB_VECTORS (NR_CPUS)
> #else
> # define NUM_INVALIDATE_TLB_VECTORS (32)
> #endif
> 
> #define INVALIDATE_TLB_VECTOR_END	(0xee)
> #define INVALIDATE_TLB_VECTOR_START	\
> 	(INVALIDATE_TLB_VECTOR_END-NUM_INVALIDATE_TLB_VECTORS+1)

That looks much nicer!

Mind sending a patch? I zapped the original non-working workaround from -tip.

Thanks,

	Ingo
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