From ac72e7888a612dccfbc15b34698aad441bdfda10 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 30 Jan 2008 13:33:21 +0100 Subject: x86: add generic clearcpuid=... option Add a generic option to clear any cpuid bit. I added it because it was very easy to add with the new generic cpuid disable bitmap and perhaps it will be useful in the future. Signed-off-by: Andi Kleen Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/cpu/common.c | 11 +++++++++++ arch/x86/kernel/setup_64.c | 11 +++++++++++ 2 files changed, 22 insertions(+) (limited to 'arch/x86') diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 56b7ea8e6c79..56cc341cc586 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -572,6 +572,17 @@ void __cpuinit print_cpu_info(struct cpuinfo_x86 *c) printk("\n"); } +static __init int setup_disablecpuid(char *arg) +{ + int bit; + if (get_option(&arg, &bit) && bit < NCAPINTS*32) + setup_clear_cpu_cap(bit); + else + return 0; + return 1; +} +__setup("clearcpuid=", setup_disablecpuid); + cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE; /* This is hacky. :) diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c index cb9b8a90c094..79635b7bd57a 100644 --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -1050,6 +1050,17 @@ void __cpuinit print_cpu_info(struct cpuinfo_x86 *c) printk(KERN_CONT "\n"); } +static __init int setup_disablecpuid(char *arg) +{ + int bit; + if (get_option(&arg, &bit) && bit < NCAPINTS*32) + setup_clear_cpu_cap(bit); + else + return 0; + return 1; +} +__setup("clearcpuid=", setup_disablecpuid); + /* * Get CPU information for use by the procfs. */ -- cgit v1.2.2