linux-kernel - Re: wakeup code translated to .c

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Message-Id: <200802032333.02821.rjw@sisk.pl>
Date:	Sun, 3 Feb 2008 23:33:02 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: wakeup code translated to .c

On Sunday, 3 of February 2008, Pavel Machek wrote:
> Hi!
> 
> > > This version works on 32-bit, and builds on 64-bit (but I'm pretty
> > > sure it does not work. 32-bit code probably needs to go into rm/....)
> > > 
> > 
> > Do you have an updated version or is this the latest one?
> 
> I'm glad you ask ;-). Here's reasonably-recent version (I have
> slightly cleaner one, but it got obscured by 2.6.24-git merge), I
> eventually got it to work on 64-bit, by reusing trampoline.S code.

I needed to rebase it against the current mainline (Makefile conflict).

Some remarks:

- It looks like arch/x86/kernel/acpi/wakeup.S is not necessary any more.

- These warnings:

/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c: In function ‘acpi_save_state_mem’:
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:41: warning: initialization makes pointer from integer without a cast
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:50: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:50: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long unsigned int’
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:70: warning: ISO C90 forbids mixed declarations and code
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:82: warning: assignment makes integer from pointer without a cast
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:83: warning: assignment makes integer from pointer without a cast
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:84: warning: ISO C90 forbids mixed declarations and code
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:87: warning: ISO C90 forbids mixed declarations and code
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:90: warning: assignment makes integer from pointer without a cast
/home/rafael/src/linux-2.6/arch/x86/kernel/acpi/sleep.c:91: warning: ISO C90 forbids mixed declarations and code

look pretty scary.

- Could the real mode directory be called just "real-mode" or something like
  this ("rm" is not very meaningful :-))?

Apart from the above and the _WAKEUP hacks mentioned elsewhere, it looks okay
(from a very high orbit).

Greetings,
Rafael
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