To disable CLFLUSH usage, especially in change_page_attr(). Ingo asked for this.
Signed-off-by: Andi Kleen <[EMAIL PROTECTED]> --- Documentation/kernel-parameters.txt | 2 ++ arch/x86/kernel/cpu/common.c | 7 +++++++ arch/x86/kernel/setup_64.c | 7 +++++++ 3 files changed, 16 insertions(+) Index: linux/arch/x86/kernel/cpu/common.c =================================================================== --- linux.orig/arch/x86/kernel/cpu/common.c +++ linux/arch/x86/kernel/cpu/common.c @@ -542,6 +542,13 @@ void __cpuinit detect_ht(struct cpuinfo_ } #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; Index: linux/arch/x86/kernel/setup_64.c =================================================================== --- linux.orig/arch/x86/kernel/setup_64.c +++ linux/arch/x86/kernel/setup_64.c @@ -1042,6 +1042,13 @@ void __cpuinit identify_cpu(struct cpuin } } +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]) Index: linux/Documentation/kernel-parameters.txt =================================================================== --- linux.orig/Documentation/kernel-parameters.txt +++ linux/Documentation/kernel-parameters.txt @@ -1173,6 +1173,8 @@ and is between 256 and 4096 characters. 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/