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Commit 191679fd authored by Andi Kleen's avatar Andi Kleen Committed by Ingo Molnar
Browse files

x86: add noclflush option 



To disable CLFLUSH usage, especially in change_page_attr().

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 404ee5b1

Documentation/kernel-parameters.txt

+2 −0
Original line number 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

			legacy floating-point registers on task switch.



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



	nohlt		[BUGS=ARM]



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

arch/x86/kernel/cpu/common.c

+7 −0
Original line number Diff line number Diff line
@@ -542,6 +542,13 @@ void __cpuinit detect_ht(struct cpuinfo_x86 *c) 
}

#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)

{

	char *vendor = NULL;

arch/x86/kernel/setup_64.c

+7 −0
Original line number 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)

{

	if (c->x86_model_id[0])