[PATCH 07/22] risc-v: replace bitmap_weight with bitmap_empty in riscv_fill_hwcap()

From: Yury Norov <yury.norov@gmail.com>
To: "Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
	"David Laight" <David.Laight@ACULAB.COM>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Joe Perches" <joe@perches.com>,
	"Julia Lawall" <Julia.Lawall@inria.fr>,
	"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
	"Nicholas Piggin" <npiggin@gmail.com>,
	"Nicolas Palix" <nicolas.palix@imag.fr>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Rasmus Villemoes" <linux@rasmusvillemoes.dk>,
	"Matti Vaittinen" <Matti.Vaittinen@fi.rohmeurope.com>,
	linux-kernel@vger.kernel.org
Cc: Yury Norov <yury.norov@gmail.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Anup Patel <anup@brainfault.org>,
	Atish Patra <atishp@atishpatra.org>,
	Jisheng Zhang <jszhang@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Tsukasa OI <research_trasio@irq.a4lg.com>,
	linux-riscv@lists.infradead.org
Subject: [PATCH 07/22] risc-v: replace bitmap_weight with bitmap_empty in riscv_fill_hwcap()
Date: Tue, 10 May 2022 08:47:35 -0700	[thread overview]
Message-ID: <20220510154750.212913-8-yury.norov@gmail.com> (raw)
In-Reply-To: <20220510154750.212913-1-yury.norov@gmail.com>

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>
---
 arch/riscv/kernel/cpufeature.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 1b2d42d7f589..f0298d756f66 100644
--- 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
-- 
2.32.0


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
