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x86: add noclflush option

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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>
This commit is contained in:
Andi Kleen 2008-01-30 13:33:21 +01:00 committed by Ingo Molnar
parent 404ee5b14b
commit 191679fdfa
3 changed files with 16 additions and 0 deletions
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2
Documentation/kernel-parameters.txt
View file

@ -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

7
arch/x86/kernel/cpu/common.c
View file

@ -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;

7
arch/x86/kernel/setup_64.c
View file

@ -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])