x86: separate cmpxchg8b checking from PAE checking

.. allowing the former to be use in non-PAE kernels, too. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
git-mirror · May 12, 2008 · f8096f9 · f8096f9
1 parent 492c2e4
commit f8096f9
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Showing 2 changed files with 9 additions and 1 deletion.
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
@@ -399,6 +399,10 @@ 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

diff --git a/include/asm-x86/required-features.h b/include/asm-x86/required-features.h
@@ -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