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 174DE568FD7; Wed, 9 Sep 2026 13:35:38 +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=1788960939; cv=none; b=NwepA4ijb24nWze/neLKAc60Q9GLdk+ojnYpO2fa0nF3/tDbF+XJEmnHyAuQ4+fHHvaq03g7IKacybUrQmNFTaE/nmAA7zhgHzkGP6tHk/MQxeZtC7tu8/tJqwsiVb8RsdLe0WgySX48Eybpn+pE0LVG1S3+56UVf0OY5fC3hSk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788960939; c=relaxed/simple; bh=elFTRUDefqtCYtZsGvjwDH8AmlVM1CM5zJvcDj1v4k4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=oU55aaH8fKhwXiq77HSlYazLh1W4Z847XkQtNPPU+UxslB67obxnSb2zbvkBGXVOOBi5CO7lk5JjsV2Li+qVnZ7kK/iFBG65Ll1rsqUaWCYD0Vw4orudlOLe6QkEClkj2SmfZzuokSM3r43e1IOOEwcO46pptUNXGcvUNcdXQdM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VIGyAPDE; 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="VIGyAPDE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B50331F00A3F; Wed, 9 Sep 2026 13:35:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788960937; bh=H1aBakRnV2iGUhIOAlr/N+D/FmN54uy58dpZhC/x4NY=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=VIGyAPDEKWd20kwvIUqot+xQIE1FKSVvgNyZ/BCaSBYBZ4/l7RmtwfUKsLtebNCZC KUyOuqdC7+6aDRTaV1D3LxHQ9jcb8ulJWjSiHbeVDIaV9LTxKQtl2kvyiCOKuiOd0B Rl5dwNfAArIAw6DLBbH8KfEbMCs1DGQKausO5zq8k/HjKGOfi9RcFBbS5TrbaolCAp bgFnI7XplUYPs4LONuG6s/f7TGDl+N+VbjGs2+CKIMZSFpZ6igjtJ9E7jJs+bJJ+yy PXooZ4itjy+6yrPhTiIiI8A9nIgqzsg18kC/pgJBbg/o6baV8bGpycq2hlzZs2JIsO OMjP5QzdY7mLg== From: "David Hildenbrand (Arm)" Date: Wed, 09 Sep 2026 15:33:04 +0200 Subject: [PATCH 11/12] fs/proc/page: clarify comment in get_max_dump_pfn() Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260909-b4-sparsemem_cleanups-v1-11-008fc8d579fe@kernel.org> References: <20260909-b4-sparsemem_cleanups-v1-0-008fc8d579fe@kernel.org> In-Reply-To: <20260909-b4-sparsemem_cleanups-v1-0-008fc8d579fe@kernel.org> To: Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Baolin Wang , Brendan Jackman , Johannes Weiner , Zi Yan , Oscar Salvador , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Jan Kiszka , Kieran Bingham Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org, driver-core@lists.linux.dev, linux-fsdevel@vger.kernel.org, "David Hildenbrand (Arm)" X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=998; i=david@kernel.org; h=from:subject:message-id; bh=elFTRUDefqtCYtZsGvjwDH8AmlVM1CM5zJvcDj1v4k4=; b=owGbwMvMwCF2/OVpCdfQ3ZWMp9WSGLIWJphmno7ZtaEjffuh/wH302o/Tb+27Zvs1DvC0Q0q6 ftjn2RrdJSyMIhxMMiKKbIEBd83ePlyXW21Gx8zzBxWJpAhDFycAjCR6NmMDMtvbK71sotI4+J/ o3Jcb+/Hh59sA5ctevyKp9qXn6c0LZPhD6fr25qaNd2XSyMTtt5Kf7j1029HxWYPp81f1I45Zey 8yQwA X-Developer-Key: i=david@kernel.org; a=openpgp; fpr=1BD9CAAD735C4C3A460DFCCA4DDE10F700FF835A pfn_to_online_page() will only succeed on some PFNs within the same section, not necessarily all. Let's make that clearer. Signed-off-by: David Hildenbrand (Arm) --- fs/proc/page.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/fs/proc/page.c b/fs/proc/page.c index 260772b20bd99..6856ff3e3cf28 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -31,10 +31,9 @@ static inline unsigned long get_max_dump_pfn(void) { #ifdef CONFIG_SPARSEMEM /* - * The memmap of early sections is completely populated and marked - * online even if max_pfn does not fall on a section boundary - - * pfn_to_online_page() will succeed on all pages. Allow inspecting - * these memmaps. + * If max_pfn does not fall on a section boundary, pfn_to_online_page() + * can succeed on PFNs beyond max_pfn within the same section. Allow + * inspecting these memmaps. */ return round_up(max_pfn, PAGES_PER_SECTION); #else -- 2.43.0