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fs/proc/page: clarify comment in get_max_dump_pfn()

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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".

Link: https://lore.kernel.org/20260921-b4-sparsemem_cleanups-v2-12-54d81d65e125@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Qi Zheng <qi.zheng@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Brendan Jackman <brendan.jackman@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
David Hildenbrand (Arm) 2026-09-21 21:59:04 +02:00 committed by Andrew Morton
parent 0632840dba
commit 3f4b13b060
1 changed files with 3 additions and 4 deletions
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7
fs/proc/page.c
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@ -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