linux-kernel - Re: [patch 00/13] x86: PAT support updated

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Message-ID: <20080321145505.GA4868@elte.hu>
Date:	Fri, 21 Mar 2008 15:55:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	venkatesh.pallipadi@...el.com
Cc:	ak@....de, ebiederm@...ssion.com, rdreier@...co.com,
	torvalds@...ux-foundation.org, gregkh@...e.de, airlied@...net.ie,
	davej@...hat.com, tglx@...utronix.de, hpa@...or.com,
	akpm@...ux-foundation.org, arjan@...radead.org,
	jesse.barnes@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [patch 00/13] x86: PAT support updated - v3


* Ingo Molnar <mingo@...e.hu> wrote:

> > The patchset is against x86 testing from couple of days back.
> 
> thanks Venki, i've queued this up so that we can see how well it goes. 
> It now looks a lot less dangerous and more compatible than it did 
> before - but i'm sure there'll be issues nevertheless :-/

no big issues so far, just a simple build fix for the !MTRR case below.

	Ingo

----------------->
Subject: x86: PAT fix
From: Ingo Molnar <mingo@...e.hu>
Date: Fri Mar 21 15:42:28 CET 2008

build fix for !CONFIG_MTRR.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/asm-x86/mtrr.h |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

Index: linux-x86.q/include/asm-x86/mtrr.h
===================================================================
--- linux-x86.q.orig/include/asm-x86/mtrr.h
+++ linux-x86.q/include/asm-x86/mtrr.h
@@ -84,10 +84,9 @@ struct mtrr_gentry
 
 #ifdef __KERNEL__
 
-extern u8 mtrr_type_lookup(u64 addr, u64 end);
-
 /*  The following functions are for use by other drivers  */
 # ifdef CONFIG_MTRR
+extern u8 mtrr_type_lookup(u64 addr, u64 end);
 extern void mtrr_save_fixed_ranges(void *);
 extern void mtrr_save_state(void);
 extern int mtrr_add (unsigned long base, unsigned long size,
@@ -101,6 +100,13 @@ extern void mtrr_ap_init(void);
 extern void mtrr_bp_init(void);
 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 #  else
+static inline u8 mtrr_type_lookup(u64 addr, u64 end)
+{
+	/*
+	 * Return no-MTRRs:
+	 */
+	return 0xff;
+}
 #define mtrr_save_fixed_ranges(arg) do {} while (0)
 #define mtrr_save_state() do {} while (0)
 static __inline__ int mtrr_add (unsigned long base, unsigned long size,
--
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