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x86/fpu/init: Clean up and comment the __setup() functions

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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>
This commit is contained in:
Ingo Molnar 2015-05-20 11:39:35 +02:00
parent 7cf82d33b6
commit 5856afed0c
1 changed files with 25 additions and 10 deletions
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35
arch/x86/kernel/fpu/init.c
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@ -284,42 +284,57 @@ static int __init no_387(char *s)
setup_clear_cpu_cap(X86_FEATURE_FPU); setup_clear_cpu_cap(X86_FEATURE_FPU);
return 1; return 1;
} }
__setup("no387", no_387); __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)) if (strlen(s))
return 0; return 0;
setup_clear_cpu_cap(X86_FEATURE_XSAVE); setup_clear_cpu_cap(X86_FEATURE_XSAVE);
setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT); setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT);
setup_clear_cpu_cap(X86_FEATURE_XSAVES); setup_clear_cpu_cap(X86_FEATURE_XSAVES);
setup_clear_cpu_cap(X86_FEATURE_AVX); setup_clear_cpu_cap(X86_FEATURE_AVX);
setup_clear_cpu_cap(X86_FEATURE_AVX2); setup_clear_cpu_cap(X86_FEATURE_AVX2);
return 1; 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); setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT);
return 1; 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); setup_clear_cpu_cap(X86_FEATURE_XSAVES);
return 1; 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);
setup_clear_cpu_cap(X86_FEATURE_FXSR_OPT); setup_clear_cpu_cap(X86_FEATURE_FXSR_OPT);
setup_clear_cpu_cap(X86_FEATURE_XMM); setup_clear_cpu_cap(X86_FEATURE_XMM);
return 1; return 1;
} }
__setup("nofxsr", x86_fxsr_setup); __setup("nofxsr", x86_nofxsr_setup);