risc-v: replace bitmap_weight with bitmap_empty in riscv_fill_hwcap()

bitmap_empty() is better than bitmap_weight() because it may return
earlier, and improves on readability.

CC: Albert Ou <aou@eecs.berkeley.edu>
CC: Anup Patel <anup@brainfault.org>
CC: Atish Patra <atishp@atishpatra.org>
CC: Jisheng Zhang <jszhang@kernel.org>
CC: Palmer Dabbelt <palmer@dabbelt.com>
CC: Paul Walmsley <paul.walmsley@sifive.com>
CC: Tsukasa OI <research_trasio@irq.a4lg.com>
CC: linux-riscv@lists.infradead.org
CC: linux-kernel@vger.kernel.org
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 1b2d42d..f0298d7 100644 (file)
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -206,11 +206,10 @@ void __init riscv_fill_hwcap(void)
                else
                        elf_hwcap = this_hwcap;
 
-               if (bitmap_weight(riscv_isa, RISCV_ISA_EXT_MAX))
-                       bitmap_and(riscv_isa, riscv_isa, this_isa, RISCV_ISA_EXT_MAX);
-               else
+               if (bitmap_empty(riscv_isa, RISCV_ISA_EXT_MAX))
                        bitmap_copy(riscv_isa, this_isa, RISCV_ISA_EXT_MAX);
-
+               else
+                       bitmap_and(riscv_isa, riscv_isa, this_isa, RISCV_ISA_EXT_MAX);
        }
 
        /* We don't support systems with F but without D, so mask those out