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Thu, 07 Aug 2025 00:58:19 -0700 (PDT) Received: from pc638.lan ([2001:9b1:d5a0:a500:2d8:61ff:fec9:d743]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-55b88c9b1fesm2501995e87.96.2025.08.07.00.58.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Aug 2025 00:58:18 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Vlastimil Babka , Michal Hocko , Baoquan He , LKML , Uladzislau Rezki Subject: [PATCH 8/8] mm: Drop __GFP_DIRECT_RECLAIM flag if PF_MEMALLOC is set Date: Thu, 7 Aug 2025 09:58:10 +0200 Message-Id: <20250807075810.358714-9-urezki@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250807075810.358714-1-urezki@gmail.com> References: <20250807075810.358714-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: fjc1n68qt9amxh4s1i3qwdzm4owowa4x X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 418F8140008 X-Rspam-User: X-HE-Tag: 1754553500-505038 X-HE-Meta: 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 todPk0Yi 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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: The memory allocator already avoids reclaim when PF_MEMALLOC is set. Clear __GFP_DIRECT_RECLAIM explicitly to suppress might_alloc() warnings to make more correct behavior. Signed-off-by: Uladzislau Rezki (Sony) --- include/linux/sched/mm.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h index 2201da0afecc..8332fc09f8ac 100644 --- a/include/linux/sched/mm.h +++ b/include/linux/sched/mm.h @@ -246,12 +246,14 @@ static inline bool in_vfork(struct task_struct *tsk) * PF_MEMALLOC_NOIO implies GFP_NOIO * PF_MEMALLOC_NOFS implies GFP_NOFS * PF_MEMALLOC_PIN implies !GFP_MOVABLE + * PF_MEMALLOC implies !__GFP_DIRECT_RECLAIM */ static inline gfp_t current_gfp_context(gfp_t flags) { unsigned int pflags = READ_ONCE(current->flags); - if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS | PF_MEMALLOC_PIN))) { + if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS | + PF_MEMALLOC_PIN | PF_MEMALLOC))) { /* * NOIO implies both NOIO and NOFS and it is a weaker context * so always make sure it makes precedence @@ -263,6 +265,9 @@ static inline gfp_t current_gfp_context(gfp_t flags) if (pflags & PF_MEMALLOC_PIN) flags &= ~__GFP_MOVABLE; + + if (pflags & PF_MEMALLOC) + flags &= ~__GFP_DIRECT_RECLAIM; } return flags; } -- 2.39.5