[v4,5/5] sparc64: Use sparc optimized fls and __fls for T4 and above

Message ID 1507747806-10251-6-git-send-email-vijay.ac.kumar@oracle.com
State Accepted
Delegated to: David Miller
Headers show
Series
  • sparc64: Optimize fls and __fls
Related show

Commit Message

Vijay Kumar Oct. 11, 2017, 6:50 p.m.
For T4 and above, patch fls and __fls functions
at the boot time to use lzcnt instruction.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
---
 arch/sparc/kernel/head_64.S |    2 ++
 arch/sparc/lib/NG4patch.S   |    9 +++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S
index 4de9fbd..f362ecb 100644
--- a/arch/sparc/kernel/head_64.S
+++ b/arch/sparc/kernel/head_64.S
@@ -640,6 +640,8 @@  niagara4_patch:
 	 nop
 	call	niagara4_patch_pageops
 	 nop
+	call	niagara4_patch_fls
+	 nop
 
 	ba,a,pt	%xcc, 80f
 	 nop
diff --git a/arch/sparc/lib/NG4patch.S b/arch/sparc/lib/NG4patch.S
index 3cc0f8c..da65a3e 100644
--- a/arch/sparc/lib/NG4patch.S
+++ b/arch/sparc/lib/NG4patch.S
@@ -3,6 +3,8 @@ 
  * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
  */
 
+#include <linux/linkage.h>
+
 #define BRANCH_ALWAYS	0x10680000
 #define NOP		0x01000000
 #define NG_DO_PATCH(OLD, NEW)	\
@@ -52,3 +54,10 @@  niagara4_patch_pageops:
 	retl
 	 nop
 	.size	niagara4_patch_pageops,.-niagara4_patch_pageops
+
+ENTRY(niagara4_patch_fls)
+	NG_DO_PATCH(fls, NG4fls)
+	NG_DO_PATCH(__fls, __NG4fls)
+	retl
+	 nop
+ENDPROC(niagara4_patch_fls)