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Thu, 15 Jan 2026 17:22:32 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id LMW8FFgiaWmFDQAAD6G6ig (envelope-from ); Thu, 15 Jan 2026 17:22:32 +0000 Message-ID: <88beb165-cb8a-4c13-af96-2a7e39653f17@suse.cz> Date: Thu, 15 Jan 2026 18:22:31 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] mm: use nodes_and() return value to simplify client code Content-Language: en-US To: Yury Norov , Andrew Morton , Alistair Popple , Byungchul Park , David Hildenbrand , Gregory Price , Johannes Weiner , Joshua Hahn , "Liam R. Howlett" , Lorenzo Stoakes , Matthew Brost , Michal Hocko , =?UTF-8?Q?Michal_Koutn=C3=BD?= , Mike Rapoport , Rakie Kim , Suren Baghdasaryan , Tejun Heo , Waiman Long , Ying Huang , Zi Yan , cgroups@vger.kernel.org Cc: Yury Norov , Rasmus Villemoes , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260114172217.861204-1-ynorov@nvidia.com> <20260114172217.861204-3-ynorov@nvidia.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20260114172217.861204-3-ynorov@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Stat-Signature: pjdexbm5adddc797pjjp1zictce3r3n3 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 077EE80005 X-Rspam-User: X-HE-Tag: 1768497753-173955 X-HE-Meta: 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 cHXQ/V/9 iVgAxKUgyOeDvJTUwh32LAbGlkeDvu4vf+wMzyS5pVPm6o8M83QqAlsVwOIeI+l2Wu0cH9rPPxAXCeeGUiKHgYvWx8wCOmwC/kRj0e072Fk8Gse29uE3iDltR/1RQO3Q+c0yOs/LCuUx5zb2uCll4D9TLqOySELHYuTkHGGo2CTPllXUwhVZkYoZM9BhU8QrflTCZpwjmdxeNMRuVkugqGJVjVzQHu8rol1ywMTrCmc8HfRpAn3ncVay+WEnUOq0B6EmXVKOjFZquyLE5dgNbjl4ypIepPtj+GYzk1GW4B8Un4rRwelPuxkPdYEmZswFwgRb6JeEPSC8z47GyGyHIxEuZ08l8R4abjOoLwtvl/oq+YumRp81HtFx83vPmQz8CslkD388R80DYu3rcc26r1IMTIK1nofKoXNF8XcrbbCAJzIc= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/14/26 18:22, Yury Norov wrote: > establish_demotion_targets() and kernel_migrate_pages() call > node_empty() immediately after calling nodes_and(). Now that > nodes_and() return false if nodemask is empty, drop the latter. > > Signed-off-by: Yury Norov Acked-by: Vlastimil Babka > --- > mm/memory-tiers.c | 3 +-- > mm/mempolicy.c | 3 +-- > 2 files changed, 2 insertions(+), 4 deletions(-) > > diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c > index 864811fff409..2cbef49a587d 100644 > --- a/mm/memory-tiers.c > +++ b/mm/memory-tiers.c > @@ -475,8 +475,7 @@ static void establish_demotion_targets(void) > */ > list_for_each_entry_reverse(memtier, &memory_tiers, list) { > tier_nodes = get_memtier_nodemask(memtier); > - nodes_and(tier_nodes, node_states[N_CPU], tier_nodes); > - if (!nodes_empty(tier_nodes)) { > + if (nodes_and(tier_nodes, node_states[N_CPU], tier_nodes)) { > /* > * abstract distance below the max value of this memtier > * is considered toptier. > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > index 68a98ba57882..92a0bf7619a2 100644 > --- a/mm/mempolicy.c > +++ b/mm/mempolicy.c > @@ -1909,8 +1909,7 @@ static int kernel_migrate_pages(pid_t pid, unsigned long maxnode, > } > > task_nodes = cpuset_mems_allowed(current); > - nodes_and(*new, *new, task_nodes); > - if (nodes_empty(*new)) > + if (!nodes_and(*new, *new, task_nodes)) > goto out_put; > > err = security_task_movememory(task);