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 2024A43E9E0; Mon, 21 Sep 2026 20:01:14 +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=1790020877; cv=none; b=jpUfl3/qarT72FKy92FO6ed5SATW1s51R80cdJYwwpTeE2kKquPAXeW6ssK4SMXWYAIyQ9/6BkUrV8nLoR9xeONuzfC38P1jDVMKzztTJbBt5z8KIxx5UPYV72PDSgtnVDCsCbUMadq04+W/5hU8wIPo89eealTc3QjpPMDCSLg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790020877; c=relaxed/simple; bh=kW71CGw1PYjxPgKG6zvCBhURTueD7ZfqBQYFE8KvMsc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=YIEPdUUl53jLYFm8MHlKCw74Dy0pGySo67pqG33rlYgCBZ5U5BWN1ZZ+5ub5K/U/GbX08o9NAdgn8J++Za+qXQTFWIKTZ+XwAXY0fehHD8ouAp4q5Rp+YGCjPAWzP4zNuIGSGf7uqshTwByspScD9C2wVsspTbNJWkyn/ImTv5k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lPA7bQ0Y; 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="lPA7bQ0Y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 142131F000FF; Mon, 21 Sep 2026 20:01:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790020873; bh=AX6nGJVBYsmzhxob//RZpUMd+OEByTGb1my+643nlcM=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=lPA7bQ0Y8NxC0wuxHCH8bXKmGCDNvYNwrEnqOF9CaZeXU6vSkj2f3dtIY254mbADY 3wrcuT/NmJsCr5vJIcN2+Rz8l5EE0EOLaufW17kc9fxVSj7Frao5VgbBSKfe2t0+EQ tQC6mXZmOFpNtg3z5krpUo/v1PYq89Cv8XZNO49C29i62EzNT3KJcJZFd2KG+E1ooX TGojP2sXyqOw+85W+UJEEzDVsBAqzEmh33DjIPdbbGUJbarzWsQ5a0VtjQk2N1emnG OalGVrUHAe1GmmuW/Z0uLwW3dHLhlQWFGXu15hYmBp/c5bFFtYDlku6c1HEPC81FYc ZoHoVwdO7VSUQ== From: "David Hildenbrand (Arm)" Date: Mon, 21 Sep 2026 21:59:04 +0200 Subject: [PATCH v2 12/13] fs/proc/page: clarify comment in get_max_dump_pfn() Precedence: bulk X-Mailing-List: linux-kernel@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: <20260921-b4-sparsemem_cleanups-v2-12-54d81d65e125@kernel.org> References: <20260921-b4-sparsemem_cleanups-v2-0-54d81d65e125@kernel.org> In-Reply-To: <20260921-b4-sparsemem_cleanups-v2-0-54d81d65e125@kernel.org> To: Andrew Morton , David Hildenbrand , 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 , Jan Kiszka , Kieran Bingham , Oscar Salvador , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich 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 X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1209; i=david@kernel.org; h=from:subject:message-id; bh=kW71CGw1PYjxPgKG6zvCBhURTueD7ZfqBQYFE8KvMsc=; b=owGbwMvMwCF2/OVpCdfQ3ZWMp9WSGLI29rSJql0Rmifnxm7RJB25RG++8bZ1RycJLL/6xmvXc u8ejZNHOkpZGMQ4GGTFFFmCgu8bvHy5rrbajY8ZZg4rE8gQBi5OAZjI1UhGhnkph/08EjdN0PbP n3Poxc1Ndb6bredc2LR4i2hVj+mMJycZGfb5KoXvrJq+fdGnK+LJ6YcM9y/Q+PPTvDG5Zm+v9EX H1fwA 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. While at it, rephrase it to "Allow inspection of". Acked-by: Oscar Salvador Acked-by: Lorenzo Stoakes (ARM) Reviewed-by: Mike Rapoport (Microsoft) 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 f90e1030825e9..6aa99e42ec222 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 + * inspection of these memmaps. */ return round_up(max_pfn, PAGES_PER_SECTION); #else -- 2.43.0