linux-kernel - Re: mach_reboot

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Message-ID: <20080306174311.GA23029@elte.hu>
Date:	Thu, 6 Mar 2008 18:43:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Beulich <jbeulich@...ell.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Miguel Boton <mboton.lkml@...il.com>
Subject: Re: mach_reboot_fixups()


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

> Ingo,
> 
> was it intentional to remove the call to mach_reboot_fixups() during 
> the merge of reboot_{32,64}.c? If so, it seems odd that 
> reboot_fixups_32.c was left in the tree (and there was even stuff 
> added to it). But it would rather seem that those machines dealt with 
> in that file would not reboot properly anymore (for one of my boxes I 
> added an entry in that table to make it boot properly, which is why I 
> noticed the code not being called anymore)...

good catch Jan! The patch below should fix it.

Can you see any other material difference due to the unification? 
reboot_mode is now written to 0x472 unconditionally, but we can consider 
that a bugfix. Otherwise the mode and ordering of reboot sequences seems 
to be equivalent to me.

	Ingo

------------------->
Subject: x86: re-add reboot fixups
From: Ingo Molnar <mingo@...e.hu>
Date: Thu Mar 06 18:29:43 CET 2008

Jan Beulich noticed that the reboot fixups went missing during
reboot.c unification.

(commit 4d022e35fd7e07c522c7863fee6f07e53cf3fc14)

Geode and a few other rare boards with special reboot quirks are
affected.

Reported-by: Jan Beulich <jbeulich@...ell.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/reboot.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux-x86.q/arch/x86/kernel/reboot.c
===================================================================
--- linux-x86.q.orig/arch/x86/kernel/reboot.c
+++ linux-x86.q/arch/x86/kernel/reboot.c
@@ -335,6 +335,10 @@ static inline void kb_wait(void)
 	}
 }
 
+void __attribute__((weak)) mach_reboot_fixups(void)
+{
+}
+
 void native_machine_emergency_restart(void)
 {
 	int i;
@@ -342,6 +346,8 @@ void native_machine_emergency_restart(vo
 	/* Tell the BIOS if we want cold or warm reboot */
 	*((unsigned short *)__va(0x472)) = reboot_mode;
 
+	mach_reboot_fixups(); /* for board specific fixups */
+
 	for (;;) {
 		/* Could also try the reset bit in the Hammer NB */
 		switch (reboot_type) {
--
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