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Message-Id: <20211218212014.1315894-7-yury.norov@gmail.com>
Date:   Sat, 18 Dec 2021 13:20:02 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     linux-kernel@...r.kernel.org, Yury Norov <yury.norov@...il.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alexey Klimov <aklimov@...hat.com>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Andi Kleen <ak@...ux.intel.com>, Andrew Lunn <andrew@...n.ch>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Gross <agross@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Anup Patel <anup.patel@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        David Laight <David.Laight@...LAB.COM>,
        Dennis Zhou <dennis@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Geetha sowjanya <gakula@...vell.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guo Ren <guoren@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Ian Rogers <irogers@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jason Wessel <jason.wessel@...driver.com>,
        Jens Axboe <axboe@...com>, Jiri Olsa <jolsa@...hat.com>,
        Joe Perches <joe@...ches.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Lee Jones <lee.jones@...aro.org>,
        Marc Zyngier <maz@...nel.org>, Marcin Wojtas <mw@...ihalf.com>,
        Mark Gross <markgross@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Mel Gorman <mgorman@...e.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Russell King <linux@...linux.org.uk>,
        Saeed Mahameed <saeedm@...dia.com>,
        Sagi Grimberg <sagi@...mberg.me>,
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        Solomon Peachy <pizza@...ftnet.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Steven Rostedt <rostedt@...dmis.org>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Sunil Goutham <sgoutham@...vell.com>,
        Tariq Toukan <tariqt@...dia.com>, Tejun Heo <tj@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Vineet Gupta <vgupta@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, kvm@...r.kernel.org,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-crypto@...r.kernel.org, linux-csky@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-perf-users@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 06/17] all: replace nodes_weight with nodes_empty where appropriate

Kernel code calls nodes_weight() to check if any bit of a given nodemask is
set. We can do it more efficiently with nodes_empty() because nodes_empty()
stops traversing the nodemask as soon as it finds first set bit, while
nodes_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 arch/x86/mm/amdtopology.c    | 2 +-
 arch/x86/mm/numa_emulation.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/amdtopology.c b/arch/x86/mm/amdtopology.c
index 058b2f36b3a6..b3ca7d23e4b0 100644
--- a/arch/x86/mm/amdtopology.c
+++ b/arch/x86/mm/amdtopology.c
@@ -154,7 +154,7 @@ int __init amd_numa_init(void)
 		node_set(nodeid, numa_nodes_parsed);
 	}
 
-	if (!nodes_weight(numa_nodes_parsed))
+	if (nodes_empty(numa_nodes_parsed))
 		return -ENOENT;
 
 	/*
diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c
index 1a02b791d273..9a9305367fdd 100644
--- a/arch/x86/mm/numa_emulation.c
+++ b/arch/x86/mm/numa_emulation.c
@@ -123,7 +123,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
 	 * Continue to fill physical nodes with fake nodes until there is no
 	 * memory left on any of them.
 	 */
-	while (nodes_weight(physnode_mask)) {
+	while (!nodes_empty(physnode_mask)) {
 		for_each_node_mask(i, physnode_mask) {
 			u64 dma32_end = PFN_PHYS(MAX_DMA32_PFN);
 			u64 start, limit, end;
@@ -270,7 +270,7 @@ static int __init split_nodes_size_interleave_uniform(struct numa_meminfo *ei,
 	 * Fill physical nodes with fake nodes of size until there is no memory
 	 * left on any of them.
 	 */
-	while (nodes_weight(physnode_mask)) {
+	while (!nodes_empty(physnode_mask)) {
 		for_each_node_mask(i, physnode_mask) {
 			u64 dma32_end = PFN_PHYS(MAX_DMA32_PFN);
 			u64 start, limit, end;
-- 
2.30.2

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