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Commit 46ad8d2d authored by Vijay Kumar's avatar Vijay Kumar Committed by David S. Miller
Browse files

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: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2b41ce5d

arch/sparc/kernel/head_64.S

+2 −0
Original line number Diff line number Diff line
@@ -640,6 +640,8 @@ niagara4_patch: 
	 nop

	call	niagara4_patch_pageops

	 nop

	call	niagara4_patch_fls

	 nop



	ba,a,pt	%xcc, 80f

	 nop

arch/sparc/lib/NG4patch.S

+9 −0
Original line number Diff line number Diff line
@@ -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)