From nobody Mon Feb 9 21:18:51 2026 Received: from mail-lf1-f47.google.com (mail-lf1-f47.google.com [209.85.167.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DC1A430215A for ; Wed, 1 Oct 2025 19:26:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759346819; cv=none; b=id3IobqOdRloOFFl3xt8JXI93ND1bZxJQiH86xGaqLpSHRMoG6lsiRYGILTn29K+dVzI4Hf7rs8w5Q0cNbbCIEgVhulXy8yCNXuflJLDsuW0BOaxvWXTDpmsOXza7pfSFV0exZPzpIq6pwsOiFfIME+u9UVqZQninDOb616nTPY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759346819; c=relaxed/simple; bh=IK1bwSNtA4XxkG3lyr951pjs5Cd9+Svig987Fm4zdbY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uKR0Wh9MFaC5dFFp3bxal3OWFGhjWpbfaFUi2/BqjCGXmsJgoePT/ab9tnpUkCW597+AGqorPqdStFx7r426zwPAD+qYmdrwzaP0yCpLXBPNgadwN8FNDqiuxlIqmccgCHFRgUq7kdEeaehbLc63ffwwQqrtQU3Atikx/VDx/O0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=mRC0hBIp; arc=none smtp.client-ip=209.85.167.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="mRC0hBIp" Received: by mail-lf1-f47.google.com with SMTP id 2adb3069b0e04-57da66e0dc9so225524e87.0 for ; Wed, 01 Oct 2025 12:26:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1759346816; x=1759951616; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=xkBi4jfGKtCYgzp1QyKIde+SrLm3hIwzDlMhFP9SOB4=; b=mRC0hBIp+JgcHCGcdl7CAFxyLa+OGUB8JFxxQCwCEp87yHSiqj309stSS3fb26NBwj z8BFEEV/WvB/0iX/dVRar7XOZfkBibUza87BXcQnl20DujWldK8R5O4lwcnnzt3dXEvw D+OrMRHI7t5rjLBxQq1invc2kWwPKnxsDH5z/WOMT2GQPlNTd9/IEW4aX93bYPfwdPyj ozg1qMkI81yPHy/Ki6YkI5hfCxNOfsxnPJ8oQzTarKS4L0TN2WUcSmhYxkJ8rLMUKvRY y5M6ttleSxR1NsUVWn95mlRvf+g6scGEVcVu7w/0VhhfAh6cmpd21+CBmvqw0pPYOACy lYfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759346816; x=1759951616; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=xkBi4jfGKtCYgzp1QyKIde+SrLm3hIwzDlMhFP9SOB4=; b=FPOL7AStjSeHOu+8tawQfQ0lwZqSCp07UaYnCvNMYs/tGhzadBkBum0LKbLLt9Dwsn 6Pvvi7D1inKoXmNWss6DTUpmMQfxS89PbTuHYbloBLRyxszwePu8Tv0E88qfjl2YME23 QiuNido5lhDPRw7tUd6uOmxUIfdWH2nbzgxfGlqysZKoqc1WjtcQTn2zNGrUaeWB5N0J ra1SogRCppKsO36V+P6G/rB0NpH19jcpsT5AxAtJrMe+6vf0mJnaIA7Yej0iq5nNpJBd tnZoVt+ntVPSHswQ1x+zHHdWerrYM99uiWaifZaJs8kHhdQYkuPCMXjOWG9H0F1Vc5Mv kSqg== X-Forwarded-Encrypted: i=1; AJvYcCW8Zwz7ZQJ824NB+hWFmJfZVarLeglNdbHWW5aMJMKUJ3tb984CPir4XLtsLFptbAcHNK/8eaDlWBdleQM=@vger.kernel.org X-Gm-Message-State: AOJu0Yxu8AovgFqOEzysXliBberDoJ3rI6Ngrt7l2s77NcQU7KmvT1HO +fH4SyzGa+3pM7fUO6KfX3MDGR7mM+N94g2fSFKMgGNnrzuLMO9rg4Xanj9hAhV4r7A= X-Gm-Gg: ASbGncve6TeN2roi6e75rAfVASXyBeWNgiwaXValyx4Q6cghNAF+/nRy2Q5I7Bdr1Vz 5Pn1OtuiDwVQoyz7WzWSNsrw+vMARaQUOXHZwORBHXLCxlKf8EtKj5HTfJrdjoOxJdseZqt78CE 92kQ0MPtGpuxe33h8vQkIp3+1bX+9v88I8ozds5dY7MrTrN8clldZvCqieGH8AkssJFgN8vya01 lyvbZELulqRXQmLO6JghYAx+8UAxPyoXundjOYoV4SlCLnzt7HjrGZdP80Kt2hFB7b4ZjmWI7F1 /jGtkp8POKZkPsitsZS18r4MJS+LYLG7F5ILXgy9FhX129eoTzFwr4JHxS1lDKkGE2kBDhy7sej dMHjoB4RdrPpcqjatYtniio4lfAtUMsk8SWKJ2+CV X-Google-Smtp-Source: AGHT+IEkQiFaaGHGhvMaMWZ16i+DpN9GfXJ09NHbrvk7y7MEplCQ54CMiAjG/D4d/KqWTkIk76Mo9A== X-Received: by 2002:a05:6512:308b:b0:585:b05f:9459 with SMTP id 2adb3069b0e04-58af9f38cccmr1321362e87.27.1759346815828; 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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) Reviewed-by: Baoquan He --- 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); =20 + if (current->flags & PF_MEMALLOC) + return; + might_sleep_if(gfpflags_allow_blocking(gfp_mask)); } =20 --=20 2.47.3