Re: [PATCH] SPARC: Better fls64(), fls() and __fls() on SPARCv9

[David Miller <davem@xxxxxxxxxxxxx>]

You can't use popc in the default implementations, most sparc64
chips do not implement popc in hardware and it must be emulated.

You can only use it in the code that is patched in on T4 and later
cpus.

See arch/sparc/lib/NG4fls*.S