According to Linux commit 0136611c62 ("optimize hweight64 for x86_64")
this is a further improvement over the variant using only bitwise
operations. It's also a slight further code size reduction.
Suggested-by: Andrew Cooper <andrew.coop...@citrix.com>
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -12,6 +12,7 @@ config X86
select HAS_CPUFREQ
select HAS_EHCI
select HAS_EX_TABLE
+ select HAS_FAST_MULTIPLY
select HAS_GDBSX
select HAS_IOPORTS
select HAS_KEXEC
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