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Date: Wed, 14 Nov 2007 11:00:20 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
       Andi Kleen <ak@muc.de>, Chuck Ebbert <cebbert@redhat.com>,
       Christoph Hellwig <hch@infradead.org>,
       Jeremy Fitzhardinge <jeremy@goop.org>,
       Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH] Immediate Values x86 Optimization Declare Discarded	Instruction
References: <20071113194550.GA4400@Krystal> <473A017D.2030501@zytor.com> <20071113204033.GB7450@Krystal> <473A166E.3070708@zytor.com> <20071113220227.GB9057@Krystal> <473A26A2.7090007@zytor.com> <20071114003409.GA18032@Krystal> <473A4909.1020609@zytor.com> <20071114014445.GB19901@Krystal> <473A6471.4040700@zytor.com> <20071114185220.GA29533@Krystal>
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Mathieu Desnoyers wrote:
> 
> nitpicking :
> 
>> 	.section __discard,"a",@progbits
> 
> could we simply declare a 
> 
>      .section __discard,"",@progbits instead ?
> 
> I think this should remove the need to tweak the linker script, since
> the section would not be allocated.
> 

The allocation flag is a loader property, not a linker property.  It 
would still be manifest in the vmlinux file; I think this is 
undesirable.  Perhaps not a big deal, but neither is adding a /DISCARD/ 
statement to the linker script:

/DISCARD/ : { *(__discard) }

	-hpa