linux-kernel - [PATCH 5/7] mm/mm_init.c: Extend init unavailable range doc info

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Date:   Wed, 22 Nov 2023 21:24:03 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        Matthew Wilcox <willy@...radead.org>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Arnd Bergmann <arnd@...db.de>,
        Aleksandar Rikalo <aleksandar.rikalo@...mia.com>,
        Aleksandar Rikalo <arikalo@...il.com>,
        Dragan Mladjenovic <dragan.mladjenovic@...mia.com>,
        Chao-ying Fu <cfu@...ecomp.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Yinglu Yang <yangyinglu@...ngson.cn>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Marc Zyngier <maz@...nel.org>, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/7] mm/mm_init.c: Extend init unavailable range doc info

Besides of the already described reasons the pages backended memory holes
might be persistent due to having memory mapped IO spaces behind those
ranges in the framework of flatmem kernel config. Add such note to the
init_unavailable_range() method kdoc in order to point out to one more
reason of having the function executed for such regions.

Signed-off-by: Serge Semin <fancer.lancer@...il.com>

---

Please let me know if the IO-space pages must be initialized somehow
differently rather relying on free_area_init() executing the
init_unavailable_range() method.
---
 mm/mm_init.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 077bfe393b5e..3fa33e2d32ba 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -796,6 +796,7 @@ overlap_memmap_init(unsigned long zone, unsigned long *pfn)
  * - physical memory bank size is not necessarily the exact multiple of the
  *   arbitrary section size
  * - early reserved memory may not be listed in memblock.memory
+ * - memory mapped IO space
  * - memory layouts defined with memmap= kernel parameter may not align
  *   nicely with memmap sections
  *
-- 
2.42.1