From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 19569381AF9 for ; Fri, 29 May 2026 17:23:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780075439; cv=none; b=Bew5RISELKaAP4LxX5s2xjvYS7134WdBL/SJcuvwi/Fjb9ALnAtsMFb6nlf7MD+ljgTIvkDiUGSUydKZ15j3vglRUzt8nSiZBgqIVteZj7J3cWUJK0CNiB7JH9Zt1rhxmMnPTHTWFwV//HPlDruV4EA+nrtbti+SZzRDVtdjOZA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780075439; c=relaxed/simple; bh=YrpAz0FXPAhElqfhnnykZc7iFUIiRTe7Cl78ip7p8Ng=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hZTDq5Lgc1UMwKhALncRW2lSKdS4wMwbdhZSIRVw9FErhI0HE3PMwJ+2qvhDXm44HzMOmGFvus8QiraHGL0xPxtAI3JTZQBpqjWALVPvV+zxF5N2Iogl1FI1b838q8AIzfC8FIuTwoqLejOw1HEwX51OrUWV4H87OXAHNw8lQ0g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FDAzNuE8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FDAzNuE8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B2031F00893; Fri, 29 May 2026 17:23:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780075438; bh=9aQovhm+rAVLhPNqkReF29glHPCC8PiSoid5QftmxW8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=FDAzNuE84eYzlRj0x6pxTfnojupxhoDw6z5C3Kp/Bqp/PFNITli6eEtysF6NlyGag 7OTyYWl9EnSFYHx6FFsGOsf0jqOQfDSI9u+QRh/AnORDxCGpZaEekf6ror5+av9oDq t7HcL7Ki8/EaqfTUdgW3TGyCs3hdWa43bavWu2kuU4V1Q61LABh90ob4QVGARWJ0X2 dMeyrFOyanCzT0vi61zEBwum5eI/pVkR0tvg/lZUt2ieazt1NXp9mT4VC+zEbBR+DD IWsdQ8cqy8ssHaJv7fP04Bd4kCRM9h37zPlaYroz9C+lr92r/JESNrmgL/RmDWjDBQ 6yrMIaxRDcstQ== Received: from phl-compute-04.internal (phl-compute-04.internal [10.202.2.44]) by mailfauth.phl.internal (Postfix) with ESMTP id 8DF7DF4006D; Fri, 29 May 2026 13:23:56 -0400 (EDT) Received: from phl-frontend-03 ([10.202.2.162]) by phl-compute-04.internal (MEProxy); Fri, 29 May 2026 13:23:56 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: dmFkZTEZfpMr5/eRRE28w8SXJrP2dhbWJDto6huRdd/cnfVbAAhK4j6L5mXvQtvbZW1Tgn qdHjS1xVDGkdt7hr1SYRochmR7yuP2KsuqbhH6HkebbwRdIZkVYqIRv2TfGI9SaQtUiic8 G8SBlRV6/L2Xtb05bm6QmOQTKoj3b/RGprk0F6woL4YfqntUvh+0D5sL6ruauatQhdAfx4 sxg873kOfAaKAVmot+PkxhAMe2YWyy/aSlFAam2C/bHdTY9DLsPBVhceLLRJtCvIR2Q+zM kaoJA5O2aRPotfcyz8zPVtzBiOjMLe5Pw3NzV/bo4OKaUt+lobJ5eojHQXZMuqCslD6ATr oxy1zzjt2em+zJsRq8POPUsy4CV7PoZHrsAai4kRVafuktEUWzwlzoahhiUOPOMqVMULxU OoqIdoLTAo5WAAqArSXoEXRD/SkEHUTjv/Yu5n5CM1khoLP/Zj8mVWMYbGav2f4ELOap51 nyHTSXHFliTGg10ueqLZO/lhBP77GXxnum5X6OeJxQqeRKO2shHkz87JQ/rk7Rn5rKHBRa JzC28BFu5dhwdGTo/2Cd5xWskrDBHDkUH6cTFcJZCSe2jSZeG16EWNT/whd9WMvw6wbbQ8 BPKfQrAB/lp/adhD0u/Nww3O04VYhY8zwOvVM5i4c504T4ICiektIhpy1pKQ X-ME-Proxy: Feedback-ID: i10464835:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Fri, 29 May 2026 13:23:55 -0400 (EDT) From: "Kiryl Shutsemau (Meta)" To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Lorenzo Stoakes , Mike Rapoport , David Hildenbrand , "Kiryl Shutsemau (Meta)" , stable@vger.kernel.org, Sashiko AI review , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= , Muhammad Usama Anjum , Arnd Bergmann , Andrei Vagin , linux-fsdevel@vger.kernel.org Subject: [PATCH 2/6] fs/proc/task_mmu: use huge_page_size() in pagemap_scan_hugetlb_entry() Date: Fri, 29 May 2026 18:23:26 +0100 Message-ID: <20260529172331.356655-3-kas@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260529172331.356655-1-kas@kernel.org> References: <20260529172331.356655-1-kas@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The partial-page check compares against HPAGE_SIZE (PMD_SIZE), which is wrong for gigantic hugetlb hstates (e.g. 1G). The walker hands the callback a huge_page_size()-sized range, never start + HPAGE_SIZE, so the comparison always declares it partial and aborts the WP. Compare against the actual hstate's page size. Fixes: 52526ca7fdb9 ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs") Cc: stable@vger.kernel.org Reported-by: Sashiko AI review Signed-off-by: Kiryl Shutsemau --- fs/proc/task_mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index e21a38ac745b..1489c67e88f7 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -2960,7 +2960,7 @@ static int pagemap_scan_hugetlb_entry(pte_t *ptep, unsigned long hmask, if (~categories & PAGE_IS_WRITTEN) goto out_unlock; - if (end != start + HPAGE_SIZE) { + if (end != start + huge_page_size(hstate_vma(vma))) { /* Partial HugeTLB page WP isn't possible. */ pagemap_scan_backout_range(p, start, end); p->arg.walk_end = start; -- 2.54.0