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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 28/33] sched: Switch the fallback task allowed cpumask to HK_TYPE_DOMAIN Date: Wed, 24 Dec 2025 14:45:15 +0100 Message-ID: <20251224134520.33231-29-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251224134520.33231-1-frederic@kernel.org> References: <20251224134520.33231-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 3339D180002 X-Stat-Signature: yiiyrjs9cz4w6xbt8a1rncsht78eyo77 X-HE-Tag: 1766584172-761858 X-HE-Meta: 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 Kd6eUEhP 8f+8TlreF2ZG6z4xplMJfLh3QT2XZkmic5Gew2T9FaqibMd+IDPSa56LzU32AEj7J88KXAvsv5Xbc/iq0FkocT2sAmISd93XRQ8Jj2lhCjknpGlXS9jMJkVaOFqt5nZY+hwSDZKcevWEHdMk6xXQaM0l9RiuJq13Pxicxr8Pp1WnD/QOF6YBX5hte/GD2TJ4qukvih0LANK0dAzsWc70HTwDbrWjuAz9t6Hii6fUu+rIarColMpUT7+yaYhgu5bFV/apSv7qvLeiruCyk3pLiLcGrFRIwWA74O6s+Mb7TGQbXrKizRVHL236xDhKH0w43AMm5 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: Tasks that have all their allowed CPUs offline don't want their affinity to fallback on either nohz_full CPUs or on domain isolated CPUs. And since nohz_full implies domain isolation, checking the latter is enough to verify both. Therefore exclude domain isolation from fallback task affinity. Signed-off-by: Frederic Weisbecker --- include/linux/mmu_context.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/mmu_context.h b/include/linux/mmu_context.h index ac01dc4eb2ce..ed3dd0f3fe19 100644 --- a/include/linux/mmu_context.h +++ b/include/linux/mmu_context.h @@ -24,7 +24,7 @@ static inline void leave_mm(void) { } #ifndef task_cpu_possible_mask # define task_cpu_possible_mask(p) cpu_possible_mask # define task_cpu_possible(cpu, p) true -# define task_cpu_fallback_mask(p) housekeeping_cpumask(HK_TYPE_TICK) +# define task_cpu_fallback_mask(p) housekeeping_cpumask(HK_TYPE_DOMAIN) #else # define task_cpu_possible(cpu, p) cpumask_test_cpu((cpu), task_cpu_possible_mask(p)) #endif -- 2.51.1