Re: [Xen-devel] [PATCH] x86/apic: Improve current_local_apic_mode()

[Wei Liu <wl@xxxxxxx>]

On Tue, Jan 28, 2020 at 12:52:16PM +0000, Andrew Cooper wrote:
> boot_cpu_has(X86_FEATURE_X2APIC) doesn't need checking to interpret
> APIC_BASE_EXTD.
> 
> Also take the opportunity to optimise the generated assembly by not using
> rdmsrl().  GCC isn't clever enough to spot that it can drop the shift and or
> to put %eax in the higher half of msr_contents.
> 
> No functional change.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Wei Liu <wl@xxxxxxx>

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