Nikolay Borisov 69acbdbbef
RAS/AMD/ATL: Replace bitwise_xor_bits() with hweight16() ...
Doing hweight16() and checking whether the lsb is set is functionally
equivalent to what bitwise_xor_bits() does. In addition, it results in better
generated code as before gcc would inline the function 4 times. With hweight16(),
the resulting code boils down to 2 instructions - POPCNT and AND, and all
relevant CPUs support POPCNT.
An alternative would have been to use the __builtin_parity() function provided
by both Clang/GCC, however under some circumstances the compiler can choose not
to inline it but generate a library call which is unsupported in the kernel.
No functional changes.
[ bp: Massage commit message. ]
Signed-off-by: Nikolay Borisov <nik.borisov@suse.com >
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de >
Link: https://patch.msgid.link/20251124142517.1708451-1-nik.borisov@suse.com
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69acbdbbef