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

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For T4 and above, patch fls and __fls functions
at the boot time to use lzcnt instruction.

Signed-off-by: Vijay Kumar <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Vijay Kumar authored and David S. Miller committed 2017-11-15 14:26:46 +09:00
1 parent 2b41ce5df2
commit 46ad8d2d22
2 files changed
+11
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arch/sparc/kernel/head_64.S
+2
View File
@@ -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
View File
@@ -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)