From: "Jan Beulich" <jbeulich@novell.com>
To: <mingo@elte.hu>, <tglx@linutronix.de>, <hpa@zytor.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: [PATCH] x86: separate cmpxchg8b checking from PAE checking
Date: Tue, 22 Apr 2008 16:27:29 +0100 [thread overview]
Message-ID: <480E2001.76E4.0078.0@novell.com> (raw)
.. allowing the former to be use in non-PAE kernels, too.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
---
arch/x86/Kconfig.cpu | 4 ++++
include/asm-x86/required-features.h | 6 +++++-
2 files changed, 9 insertions(+), 1 deletion(-)
--- linux-2.6.25/arch/x86/Kconfig.cpu 2008-04-17 04:49:44.000000000 +0200
+++ 2.6.25-x86-cmpxchg64/arch/x86/Kconfig.cpu 2008-04-15 10:49:20.000000000 +0200
@@ -394,6 +394,10 @@ config X86_TSC
def_bool y
depends on ((MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ) || X86_64
+config X86_CMPXCHG64
+ def_bool y
+ depends on X86_PAE || X86_64
+
# this should be set for all -march=.. options where the compiler
# generates cmov.
config X86_CMOV
--- linux-2.6.25/include/asm-x86/required-features.h 2008-01-24 23:58:37.000000000 +0100
+++ 2.6.25-x86-cmpxchg64/include/asm-x86/required-features.h 2008-04-15 10:49:20.000000000 +0200
@@ -19,9 +19,13 @@
#if defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
# define NEED_PAE (1<<(X86_FEATURE_PAE & 31))
-# define NEED_CX8 (1<<(X86_FEATURE_CX8 & 31))
#else
# define NEED_PAE 0
+#endif
+
+#ifdef CONFIG_X86_CMPXCHG64
+# define NEED_CX8 (1<<(X86_FEATURE_CX8 & 31))
+#else
# define NEED_CX8 0
#endif
reply other threads:[~2008-04-22 15:27 UTC|newest]
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