sparc64: Use sparc optimized fls and __fls for T4 and above

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S
index 4de9fbd..f362ecb 100644 (file)
--- 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 (file)
--- 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)