linux-kernel - Re: [PATCH] Immediate Values x86 Optimization Declare Discarded Instruction

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Message-ID: <473B45C4.5030501@zytor.com>
Date:	Wed, 14 Nov 2007 11:00:20 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@....de>, Chuck Ebbert <cebbert@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] Immediate Values x86 Optimization Declare Discarded	Instruction

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
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