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| author | Andi Kleen <ak@suse.de> | 2008-01-30 13:33:21 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:33:21 +0100 |
| commit | ac72e7888a612dccfbc15b34698aad441bdfda10 (patch) | |
| tree | abd99cb2ad8ddfd7f695bcfbe6eb9b6e1183ed3d /Documentation | |
| parent | x86: add noclflush option (diff) | |
| download | linux-ac72e7888a612dccfbc15b34698aad441bdfda10.tar.xz linux-ac72e7888a612dccfbc15b34698aad441bdfda10.zip | |
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 <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 040e30a33b7c..50d564dabb13 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -416,6 +416,19 @@ and is between 256 and 4096 characters. It is defined in the file [SPARC64] tick [X86-64] hpet,tsc + clearcpuid=BITNUM [X86] + Disable CPUID feature X for the kernel. See + include/asm-x86/cpufeature.h for the valid bit numbers. + Note the Linux specific bits are not necessarily + stable over kernel options, but the vendor specific + ones should be. + Also note that user programs calling CPUID directly + or using the feature without checking anything + will still see it. This just prevents it from + being used by the kernel or shown in /proc/cpuinfo. + Also note the kernel might malfunction if you disable + some critical bits. + code_bytes [IA32/X86_64] How many bytes of object code to print in an oops report. Range: 0 - 8192 |