mm: fix mixed zone detection in devm_memremap_pages

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The check for whether we overlap "System RAM" needs to be done at
section granularity.  For example a system with the following mapping:

    100000000-37bffffff : System RAM
    37c000000-837ffffff : Persistent Memory

...is unable to use devm_memremap_pages() as it would result in two
zones colliding within a given section.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

...

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Dan Williams 2016-03-09 14:08:13 -08:00 • committed by Linus Torvalds

parent d77a117e68

commit 5f29a77cd9

1 changed files with 6 additions and 5 deletions

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kernel/memremap.c

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