From: Andrew Morton <akpm@linux-foundation.org>
Date: Sun, 1 Jul 2007 19:06:48 +0000 (-0700)
Subject: i386: mtrr crash fix
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=84288ad89e9736c7478e138f247397b9ab7a9d28;p=openwrt%2Fstaging%2Fblogic.git

i386: mtrr crash fix

Commit 3ebad5905609476a4ff1151a66b21d9794009961 ("[PATCH] x86: Save and
restore the fixed-range MTRRs of the BSP when suspending") added mtrr
operations without verifying that the CPU has MTRRs.  Crashes transmeta
CPUs.

Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <linux@horizon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/i386/kernel/cpu/mtrr/generic.c b/arch/i386/kernel/cpu/mtrr/generic.c
index 5a551fb7ea7b..f6e46943e6ef 100644
--- a/arch/i386/kernel/cpu/mtrr/generic.c
+++ b/arch/i386/kernel/cpu/mtrr/generic.c
@@ -65,7 +65,8 @@ get_fixed_ranges(mtrr_type * frs)
 
 void mtrr_save_fixed_ranges(void *info)
 {
-	get_fixed_ranges(mtrr_state.fixed_ranges);
+	if (cpu_has_mtrr)
+		get_fixed_ranges(mtrr_state.fixed_ranges);
 }
 
 static void print_fixed(unsigned base, unsigned step, const mtrr_type*types)