x86/asm: Clarify static_cpu_has()'s intended use (bfdd5a67) · Commits · 戴 / test

Clarify when one should use static_cpu_has() and when one should use boot_cpu_has(). Requested-by:

arch/x86/include/asm/cpufeature.h

+6 −3

Original line number	Diff line number	Diff line
		@@ -155,9 +155,12 @@ extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit);
		#else

		/*
		* Static testing of CPU features. Used the same as boot_cpu_has().
		* These will statically patch the target code for additional
		* performance.
		* Static testing of CPU features. Used the same as boot_cpu_has(). It
		* statically patches the target code for additional performance. Use
		* static_cpu_has() only in fast paths, where every cycle counts. Which
		* means that the boot_cpu_has() variant is already fast enough for the
		* majority of cases and you should stick to using it as it is generally
		* only two instructions: a RIP-relative MOV and a TEST.
		*/
		static __always_inline bool _static_cpu_has(u16 bit)
		{