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Commit 6e1315fe authored by Borislav Petkov's avatar Borislav Petkov Committed by Thomas Gleixner
Browse files

x86/cpu: Provide a config option to disable static_cpu_has 



This brings .text savings of about ~1.6K when building a tinyconfig. It
is off by default so nothing changes for the default.

Kconfig help text from Josh.

Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
Link: http://lkml.kernel.org/r/1449481182-27541-5-git-send-email-bp@alien8.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 362f924b

arch/x86/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -349,6 +349,17 @@ config X86_FEATURE_NAMES 


	  If in doubt, say Y.



config X86_FAST_FEATURE_TESTS

	bool "Fast CPU feature tests" if EMBEDDED

	default y

	---help---

	  Some fast-paths in the kernel depend on the capabilities of the CPU.

	  Say Y here for the kernel to patch in the appropriate code at runtime

	  based on the capabilities of the CPU. The infrastructure for patching

	  code at runtime takes up some additional space; space-constrained

	  embedded systems may wish to say N here to produce smaller, slightly

	  slower code.



config X86_X2APIC

	bool "Support x2apic"

	depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)

arch/x86/include/asm/cpufeature.h

+1 −1
Original line number Diff line number Diff line
@@ -409,7 +409,7 @@ extern const char * const x86_bug_flags[NBUGINTS*32]; 
 * fast paths and boot_cpu_has() otherwise!

 */



#if __GNUC__ >= 4

#if __GNUC__ >= 4 && defined(CONFIG_X86_FAST_FEATURE_TESTS)

extern void warn_pre_alternatives(void);

extern bool __static_cpu_has_safe(u16 bit);