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Merge branch 'sparc64-optimized-fls'

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Vijay Kumar says:

====================
sparc64: Optimize fls and __fls

SPARC provides lzcnt instruction (with VIS3) which can be used to
optimize fls, __fls and fls64 functions. For the systems that supports
lzcnt instruction, we now do boot time patching to use sparc
optimized fls, __fls and fls64 functions.

v3->v4:
 -  Fixed a typo.
v2->v3:
 -  Using ENTRY(), ENDPROC() for assembler functions.
 -  Removed BITS_PER_LONG from __fls.
 -  Using generic fls64().
 -  Replaced lzcnt instruction with .word directive.
v1->v2:
 - Fixed delay slot issue.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-11-15 14:26:46 +09:00
commit a16036e9b2
7 changed files with 175 additions and 2 deletions
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