Re: [PATCH 2/9] x86: introduce a set of platform feature flags

[Pavel Machek]

> +#define X86_PLATFORM_FEATURE_FLOPPY		(0*32+5) /* ISA floppy */
> +#define X86_PLATFORM_FEATURE_ISA		(0*32+6) /* ISA/LPC bus */
> +#define X86_PLATFORM_FEATURE_BIOS		(0*32+7) /* BIOS service,
> +							   *  e.g. int calls
> +							   *  EBDA, etc.
> +							   */
> +#define X86_PLATFORM_FEATURE_ACPI		(0*32+8) /* has ACPI support */
> +#define X86_PLATFORM_FEATURE_SFI		(0*32+9) /* has SFI support */
> +#define X86_PLATFORM_FEATURE_8042		(0*32+10) /* i8042 KBC */
> +
> +extern __u32 platform_feature[N_PLATFORM_CAPINTS];
> +extern const char *const
> +	x86_platform_available_feature[N_PLATFORM_CAPINTS * 32];
> +#define platform_has(bit) \
> +	test_bit(bit, (unsigned long *)platform_feature)

test_bit and friends imply synchronization you probably  don't want or
need...

-- 
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