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Wed, 01 Oct 2025 12:26:55 -0700 (PDT) Received: from localhost.localdomain ([2001:9b1:d5a0:a500::24b]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-58b0112414fsm136627e87.28.2025.10.01.12.26.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Oct 2025 12:26:55 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , Baoquan He , LKML , Uladzislau Rezki , Michal Hocko Subject: [PATCH v3 08/10] mm: Skip might_alloc() warnings when PF_MEMALLOC is set Date: Wed, 1 Oct 2025 21:26:44 +0200 Message-ID: <20251001192647.195204-9-urezki@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251001192647.195204-1-urezki@gmail.com> References: <20251001192647.195204-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 9592940002 X-Stat-Signature: cqn7ktpeyqrxawmca9to4up1eobsscgb X-HE-Tag: 1759346817-123167 X-HE-Meta: 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 xce46lJy 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 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: might_alloc() catches invalid blocking allocations in contexts where sleeping is not allowed. However when PF_MEMALLOC is set, the page allocator already skips reclaim and other blocking paths. In such cases, a blocking gfp_mask does not actually lead to blocking, so triggering might_alloc() splats is misleading. Adjust might_alloc() to skip warnings when the current task has PF_MEMALLOC set, matching the allocator's actual blocking behaviour. Acked-by: Michal Hocko Signed-off-by: Uladzislau Rezki (Sony) --- include/linux/sched/mm.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h index 0232d983b715..a74582aed747 100644 --- a/include/linux/sched/mm.h +++ b/include/linux/sched/mm.h @@ -318,6 +318,9 @@ static inline void might_alloc(gfp_t gfp_mask) fs_reclaim_acquire(gfp_mask); fs_reclaim_release(gfp_mask); + if (current->flags & PF_MEMALLOC) + return; + might_sleep_if(gfpflags_allow_blocking(gfp_mask)); } -- 2.47.3