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Fri, 04 Jul 2025 08:25:46 -0700 (PDT) Received: from pc638.lan ([2001:9b1:d5a0:a500:2d8:61ff:fec9:d743]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-556383bb113sm281028e87.11.2025.07.04.08.25.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Jul 2025 08:25:45 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , LKML , Baoquan He , Uladzislau Rezki Subject: [RFC 7/7] mm: Drop __GFP_DIRECT_RECLAIM flag if PF_MEMALLOC is set Date: Fri, 4 Jul 2025 17:25:37 +0200 Message-Id: <20250704152537.55724-8-urezki@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250704152537.55724-1-urezki@gmail.com> References: <20250704152537.55724-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 6BD3540002 X-Stat-Signature: 3hyu4idtfqeb6rsfnk6rsodm897z9jfz X-HE-Tag: 1751642748-504340 X-HE-Meta: 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 OAMdNwd+ 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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 b13474825130..40757173acb1 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