sparc: Use hweight64() in popc emulation.

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

1 files changed, 4 insertions, 11 deletions

diff --git a/arch/sparc/kernel/unaligned_64.c b/arch/sparc/kernel/unaligned_64.c
index 35cff1673aa..76e4ac1a13e 100644
--- a/arch/sparc/kernel/unaligned_64.c
+++ b/arch/sparc/kernel/unaligned_64.c
@@ -22,6 +22,7 @@
 #include <linux/bitops.h>
 #include <linux/perf_event.h>
 #include <linux/ratelimit.h>
+#include <linux/bitops.h>
 #include <asm/fpumacro.h>
 
 enum direction {
@@ -373,16 +374,11 @@ asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
         }
 }
 
-static char popc_helper[] = {
-0, 1, 1, 2, 1, 2, 2, 3,
-1, 2, 2, 3, 2, 3, 3, 4, 
-};
-
 int handle_popc(u32 insn, struct pt_regs *regs)
 {
-        u64 value;
-        int ret, i, rd = ((insn >> 25) & 0x1f);
         int from_kernel = (regs->tstate & TSTATE_PRIV) != 0;
+        int ret, rd = ((insn >> 25) & 0x1f);
+        u64 value;
                                 
         perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);
         if (insn & 0x2000) {
@@ -392,10 +388,7 @@ int handle_popc(u32 insn, struct pt_regs *regs)
                 maybe_flush_windows(0, insn & 0x1f, rd, from_kernel);
                 value = fetch_reg(insn & 0x1f, regs);
         }
-        for (ret = 0, i = 0; i < 16; i++) {
-                ret += popc_helper[value & 0xf];
-                value >>= 4;
-        }
+        ret = hweight64(value);
         if (rd < 16) {
                 if (rd)
                         regs->u_regs[rd] = ret;