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| author | Ingo Molnar <mingo@kernel.org> | 2015-05-20 11:39:35 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-20 11:39:35 +0200 |
| commit | 5856afed0c8c419286d9f0c8e57e83e2875eec4b (patch) | |
| tree | 19fea6fe9cca91d4bad1bb3ac94cd829ff68edf3 | |
| parent | 7cf82d33b613780a79fda91babf7b9e6c5c82d75 (diff) | |
| download | linux-5856afed0c8c419286d9f0c8e57e83e2875eec4b.tar.bz2 | |
x86/fpu/init: Clean up and comment the __setup() functions
Explain the functions and also standardize their style
and naming.
No change in functionality.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/kernel/fpu/init.c | 35 |
1 files changed, 25 insertions, 10 deletions
diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c index fe8cce7fc5ea..9da740e236d5 100644 --- a/arch/x86/kernel/fpu/init.c +++ b/arch/x86/kernel/fpu/init.c @@ -284,42 +284,57 @@ static int __init no_387(char *s) setup_clear_cpu_cap(X86_FEATURE_FPU); return 1; } - __setup("no387", no_387); -static int __init x86_xsave_setup(char *s) +/* + * Disable all xstate CPU features: + */ +static int __init x86_noxsave_setup(char *s) { if (strlen(s)) return 0; + setup_clear_cpu_cap(X86_FEATURE_XSAVE); setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT); setup_clear_cpu_cap(X86_FEATURE_XSAVES); setup_clear_cpu_cap(X86_FEATURE_AVX); setup_clear_cpu_cap(X86_FEATURE_AVX2); + return 1; } -__setup("noxsave", x86_xsave_setup); +__setup("noxsave", x86_noxsave_setup); -static int __init x86_xsaveopt_setup(char *s) +/* + * Disable the XSAVEOPT instruction specifically: + */ +static int __init x86_noxsaveopt_setup(char *s) { setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT); + return 1; } -__setup("noxsaveopt", x86_xsaveopt_setup); +__setup("noxsaveopt", x86_noxsaveopt_setup); -static int __init x86_xsaves_setup(char *s) +/* + * Disable the XSAVES instruction: + */ +static int __init x86_noxsaves_setup(char *s) { setup_clear_cpu_cap(X86_FEATURE_XSAVES); + return 1; } -__setup("noxsaves", x86_xsaves_setup); +__setup("noxsaves", x86_noxsaves_setup); -static int __init x86_fxsr_setup(char *s) +/* + * Disable FX save/restore and SSE support: + */ +static int __init x86_nofxsr_setup(char *s) { setup_clear_cpu_cap(X86_FEATURE_FXSR); setup_clear_cpu_cap(X86_FEATURE_FXSR_OPT); setup_clear_cpu_cap(X86_FEATURE_XMM); + return 1; } -__setup("nofxsr", x86_fxsr_setup); - +__setup("nofxsr", x86_nofxsr_setup); |