linux-kernel - [PATCH] x86, cpu: X86_FEATURE_NOPL should be disabled on 32-bit only

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Message-ID: <20101003152212.GA13233@liondog.tnic>
Date:	Sun, 3 Oct 2010 17:22:12 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86, cpu: X86_FEATURE_NOPL should be disabled on 32-bit
 only

ba0593bf553c450a03dbc5f8c1f0ff58b778a0c8 cleared the aforementioned
cpuid bit only on 32-bit due to various problems with Virtual PC. This
somehow got lost during the 32- + 64-bit merge so restore the feature
bit on 64-bit.

Signed-off-by: Borislav Petkov <bp@...en8.de>
---
 arch/x86/kernel/cpu/common.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index caa967d..9a2cfeb 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -713,7 +713,9 @@ void __init early_cpu_init(void)
  */
 static void __cpuinit detect_nopl(struct cpuinfo_x86 *c)
 {
+#ifdef CONFIG_X86_32
 	clear_cpu_cap(c, X86_FEATURE_NOPL);
+#endif
 }
 
 static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
-- 
1.7.2.3

-- 
Regards/Gruss,
    Boris.
--
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