From nobody Thu Oct 2 16:32:31 2025 Received: from mail-lf1-f49.google.com (mail-lf1-f49.google.com [209.85.167.49]) (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 43A8A31D73A for ; Mon, 15 Sep 2025 13:40:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757943653; cv=none; b=bj12h6DeP6SlMkk48AxVm4CqaOPpSxzkLzVw3eYFXxgngsaZQ5ITL3QUF6xFQWTzYH5Dpkv++SEHtbfM+3URZV4KD6uM/5/UTJFhfHpAOgBRJC7Ys+N093C+AanSwPcQyMmYGw8ylUVM+K3tuT7UA2QPIJnvLBlPA0vsgIbBpJY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757943653; c=relaxed/simple; bh=ttjmvio6QfWzCovg1C7MzOvfsRCArSCL+o0LkD/11Yw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dncy/FQ11B/Av9ptCL4xa2L+W2+rbIbrWAKVKIt5fiTsLuz8TYMFu9r/TD8gXEAzezb9ZVx2cxRdCgZUyZWDN+9+L3pJR28dZF8LvwPS8yVIf8T6gGCFtqWBxpUCOnyFpzryQ46jXwNbTPYEOxvjEAwZDj6xFVs/P8MfWS43TJI= 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=QAo9Kp/s; arc=none smtp.client-ip=209.85.167.49 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="QAo9Kp/s" Received: by mail-lf1-f49.google.com with SMTP id 2adb3069b0e04-55f720ffe34so4781345e87.1 for ; Mon, 15 Sep 2025 06:40:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757943649; x=1758548449; 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=7tWr/JqVgOvXu/F9fhJXup17MiB9k9fkyyqujUfoMQs=; b=QAo9Kp/s0X8JE1WvvTFC/Qoj8M/9tj1mFqXdWldX9QyfePfkM/2bXCW99LUyETTF55 xTEnx6KLxgLexahO4GGtUzFL5DewnztFbVpvS3ADuzsQY6fcEIFgoUnM3yFU+htq3q6l AM4VZciOZR3TK1nNm2uXR7Fgrl41ARYRdqseM5oHc+9z5tA33/k+TxAc3IJ8qTtn5RIU 6tPBnEcUCoaGTlfbXKhtKMG6QF0g82mg73IYc0WRxEACAoAbQYKW2uLXECMvIMKpFrMP ZjpSman5aFS/2mKqcyaO0I8sK0IXJTG6ePYCa1gHQd2yNefOR80DsDN+bcYhDNirpwJo LiDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757943649; x=1758548449; 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=7tWr/JqVgOvXu/F9fhJXup17MiB9k9fkyyqujUfoMQs=; b=NTTLSzfSYBEAojI7WLDuEPiGvEL2alQMiFUpKqBw1DjEH7OTf90pVkIdYOaNv3TMRM aiAWptFgVoo1aoyKmO7iWCF3LmStzA6XgsconELhWP2MPyaE9lxm7zMEhMkIKnpFa8NJ S6/JUYndtk6BkNNYrvRfk+TyjGdM/R6Ep4tBoSkgy0nd+t/HLL9oC9SPbp0TieClmo6n jxrbfSyL5lsRfQLBx8jt2QMXVYCOX5/nsbxz/hIAz1QunsgdoH0JXCqP9sVectBVdtIx MVJmpfTjvtgbRU02FamhQnCUMqIN0RrhtM9wlMW4rJDroRaAlJvsGJ00jZ9C9S82VgYh jYbg== X-Forwarded-Encrypted: i=1; AJvYcCXT3A6qOA8IAZ12EIJpWAlhEXTyzPLNatrscT2VsI0yWcrnV0CHuTqnt4xafQvexhqRr8KenScvHAq8c/A=@vger.kernel.org X-Gm-Message-State: AOJu0YyafS9+XvMBJ7rG++9kMZDUeAOk6lU4vuj0dZUfZyE822VrOKWB yWGySWDcdFz3hF53pWQafNV28NNkU8uuR8sypg7mY/5V36lS3TWPzcVQj8A2iw== X-Gm-Gg: ASbGncswjDw2cIyrqy4XlVd+Gi1VdzhoZ6lv1Yg3ELgw6X2ID2Cgmg0WNgjRviCD6JH oVww9Uix0MgbCW9Z3lRFqnTqcJc94U7ac0kFauWW8RM7Ua5p7OOlXGuy3RRNZXvr8rQAP2ougpQ p4nDNXDJGSCzsfW26qOkLJCX9Haupt0S/zv2+YhMZoEb5O2NfReriK+UmEH2Gcy20h8hGIt4lDk 28czFPA2CQiBMJip9jjSpbRbCKXRS4Ti758DteZJQJL6xE82C99mBCd0WWRNcTZb20W5jsn6hgm h5i8SKlgfTziWVfAcH5zI8qaaNQqiYbqeFKgcs2uAgKuIAIhZk3UaK6OYOKEh1N7hLai7LPjtCG HrhYiok7i2wkx5aygoWtOND12Uxk= X-Google-Smtp-Source: AGHT+IGZUiqgRibPAiA5DgB0BOAerZLdpk29rMvBlfQxC3FGQGHcSpvUlZ5Nw+aF8RQ+y3vCwdokTw== X-Received: by 2002:a05:6512:31d6:b0:566:41cb:671d with SMTP id 2adb3069b0e04-57061436fa8mr3784043e87.23.1757943649092; Mon, 15 Sep 2025 06:40:49 -0700 (PDT) Received: from localhost.localdomain ([2001:9b1:d5a0:a500::24b]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-573c8330e54sm1150719e87.63.2025.09.15.06.40.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Sep 2025 06:40:48 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , Baoquan He , LKML , Uladzislau Rezki , Andrey Ryabinin , Alexander Potapenko Subject: [PATCH v2 07/10] mm/kasan: Support non-blocking GFP in kasan_populate_vmalloc() Date: Mon, 15 Sep 2025 15:40:37 +0200 Message-ID: <20250915134041.151462-8-urezki@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250915134041.151462-1-urezki@gmail.com> References: <20250915134041.151462-1-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" A "gfp_mask" is already passed to kasan_populate_vmalloc() as an argument to respect GFPs from callers and KASAN uses it for its internal allocations. But apply_to_page_range() function ignores GFP flags due to a hard-coded mask. Wrap the call with memalloc_apply_gfp_scope()/memalloc_restore_scope() so that non-blocking GFP flags(GFP_ATOMIC, GFP_NOWAIT) are respected. Cc: Andrey Ryabinin Cc: Alexander Potapenko Signed-off-by: Uladzislau Rezki (Sony) Reviewed-by: Andrey Ryabinin Reviewed-by: Baoquan He --- mm/kasan/shadow.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c index 11d472a5c4e8..c6643a72d9f6 100644 --- a/mm/kasan/shadow.c +++ b/mm/kasan/shadow.c @@ -377,18 +377,10 @@ static int __kasan_populate_vmalloc(unsigned long sta= rt, unsigned long end, gfp_ * page tables allocations ignore external gfp mask, enforce it * by the scope API */ - if ((gfp_mask & (__GFP_FS | __GFP_IO)) =3D=3D __GFP_IO) - flags =3D memalloc_nofs_save(); - else if ((gfp_mask & (__GFP_FS | __GFP_IO)) =3D=3D 0) - flags =3D memalloc_noio_save(); - + flags =3D memalloc_apply_gfp_scope(gfp_mask); ret =3D apply_to_page_range(&init_mm, start, nr_pages * PAGE_SIZE, kasan_populate_vmalloc_pte, &data); - - if ((gfp_mask & (__GFP_FS | __GFP_IO)) =3D=3D __GFP_IO) - memalloc_nofs_restore(flags); - else if ((gfp_mask & (__GFP_FS | __GFP_IO)) =3D=3D 0) - memalloc_noio_restore(flags); + memalloc_restore_scope(flags); =20 ___free_pages_bulk(data.pages, nr_pages); if (ret) --=20 2.47.3