From 46ad8d2d22c17e2b577adec55ae87161666a3267 Mon Sep 17 00:00:00 2001 From: Vijay Kumar Date: Wed, 11 Oct 2017 12:50:06 -0600 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- arch/sparc/kernel/head_64.S | 2 ++ arch/sparc/lib/NG4patch.S | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S index 4de9fbd1a177..f362ecb9955d 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 3cc0f8cc95df..da65a3ebb7cc 100644 --- a/arch/sparc/lib/NG4patch.S +++ b/arch/sparc/lib/NG4patch.S @@ -3,6 +3,8 @@ * Copyright (C) 2012 David S. Miller */ +#include + #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) -- 2.11.0