linux-kernel - Re: [rft] s2ram wakeup moves to .c, could fix few machines

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Date:	Thu, 07 Feb 2008 14:34:26 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>
Subject: Re: [rft] s2ram wakeup moves to .c, could fix few machines

Sam Ravnborg wrote:
>> +
>> +	. = 0;
>> +	.text		: { *(.text*) }
>> +
>> +	. = ALIGN(16);
> Why?

It's good practice to have at least paragraph (segment boundary) 
alignment between different types of data.  In the case of the .bss, it 
also allows cleaning with rep;movsl.

It's technically not all that necessary (except for 4-byte alignment for 
the .bss), but it makes things easier to debug on the assembly level.

>> +	/* Adjust this as appropriate */
>> +	/* This allows 4 pages (16K) */
>> +	. = ASSERT(_end <= 0x4000, "Wakeup too big!");
> PAGE_SIZE * 4?

Not really, because it's not at all related to the kernel page size; the 
reference to pages there is informal.  If we go to a larger virtual page 
size we do NOT want this to change.

	-hpa
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