From 191679fdfa63342752ff6a094a2522ae939b8d0c Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 30 Jan 2008 13:33:21 +0100 Subject: x86: add noclflush option To disable CLFLUSH usage, especially in change_page_attr(). Signed-off-by: Andi Kleen Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/cpu/common.c | 7 +++++++ arch/x86/kernel/setup_64.c | 7 +++++++ 2 files changed, 14 insertions(+) (limited to 'arch') diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index dfc9563fc4f0..56b7ea8e6c79 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -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; diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c index df159520bbd2..cb9b8a90c094 100644 --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -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]) -- cgit v1.2.2