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Commit 191679fd authored Jan 30, 2008 by Andi Kleen Committed by Ingo Molnar Jan 30, 2008

x86: add noclflush option



To disable CLFLUSH usage, especially in change_page_attr().

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 404ee5b1

Documentation/kernel-parameters.txt

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1191,6 +1191,8 @@ and is between 256 and 4096 characters. It is defined in the file
	register save and restore. The kernel will only save		register save and restore. The kernel will only save
	legacy floating-point registers on task switch.		legacy floating-point registers on task switch.

			noclflush [BUGS=X86] Don't use the CLFLUSH instruction

	nohlt [BUGS=ARM]		nohlt [BUGS=ARM]

	no-hlt [BUGS=X86-32] Tells the kernel that the hlt		no-hlt [BUGS=X86-32] Tells the kernel that the hlt

arch/x86/kernel/cpu/common.c

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -542,6 +542,13 @@ void __cpuinit detect_ht(struct cpuinfo_x86 *c)
	}		}
	#endif		#endif

			static __init int setup_noclflush(char *arg)
			{
			setup_clear_cpu_cap(X86_FEATURE_CLFLSH);
			return 1;
			}
			__setup("noclflush", setup_noclflush);

	void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)		void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
	{		{
	char *vendor = NULL;		char *vendor = NULL;

arch/x86/kernel/setup_64.c

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1032,6 +1032,13 @@ void __cpuinit identify_cpu(struct cpuinfo_x86 *c)

	}		}

			static __init int setup_noclflush(char *arg)
			{
			setup_clear_cpu_cap(X86_FEATURE_CLFLSH);
			return 1;
			}
			__setup("noclflush", setup_noclflush);

	void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)		void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
	{		{
	if (c->x86_model_id[0])		if (c->x86_model_id[0])