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mm/mm_init.c: extend init unavailable range doc info

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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.

[fancer.lancer@gmail.com: update per Mike]
  Link: https://lkml.kernel.org/r/20231202111855.18392-1-fancer.lancer@gmail.com
Link: https://lkml.kernel.org/r/20231122182419.30633-6-fancer.lancer@gmail.com
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Serge Semin 2023-11-22 21:24:03 +03:00 committed by Andrew Morton
parent f7dd74ac23
commit ecf5dd1ffe
1 changed files with 1 additions and 0 deletions
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mm/mm_init.c
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@ -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
* - non-memory regions covered by the contigious flatmem mapping
* - memory layouts defined with memmap= kernel parameter may not align
* nicely with memmap sections
*