linux-kernel - [PATCH v4 0/5] sparc64: Optimize fls and _

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Date:   Wed, 11 Oct 2017 12:50:01 -0600
From:   Vijay Kumar <vijay.ac.kumar@...cle.com>
To:     davem@...emloft.net
Cc:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
        babu.moger@...cle.com, rob.gardner@...cle.com, sam@...nborg.org,
        anthony.yznaga@...cle.com
Subject: [PATCH v4 0/5] 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.

Vijay Kumar (5):
  sparc64: Define SPARC default fls function
  sparc64: Define SPARC default __fls function
  sparc64: SPARC optimized fls function
  sparc64: SPARC optimized __fls function
  sparc64: Use sparc optimized fls and __fls for T4 and above

 arch/sparc/include/asm/bitops_64.h |    5 ++-
 arch/sparc/kernel/head_64.S        |    2 +
 arch/sparc/lib/Makefile            |    3 ++
 arch/sparc/lib/NG4fls.S            |   30 ++++++++++++++++
 arch/sparc/lib/NG4patch.S          |    9 +++++
 arch/sparc/lib/fls.S               |   67 ++++++++++++++++++++++++++++++++++++
 arch/sparc/lib/fls64.S             |   61 ++++++++++++++++++++++++++++++++
 7 files changed, 175 insertions(+), 2 deletions(-)
 create mode 100644 arch/sparc/lib/NG4fls.S
 create mode 100644 arch/sparc/lib/fls.S
 create mode 100644 arch/sparc/lib/fls64.S