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memremap: replace the altmap_valid field with a PGMAP_ALTMAP_VALID flag

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Add a flags field to struct dev_pagemap to replace the altmap_valid
boolean to be a little more extensible.  Also add a pgmap_altmap() helper
to find the optional altmap and clean up the code using the altmap using
it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Christoph Hellwig 2019-06-26 14:27:13 +02:00 • committed by Jason Gunthorpe
parent 80a72d0af0
commit 514caf23a7
9 changed files with 29 additions and 43 deletions
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6
mm/memory_hotplug.c
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@ -557,10 +557,8 @@ void __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
int sections_to_remove;
/* In the ZONE_DEVICE case device driver owns the memory region */
if (is_dev_zone(zone)) {
if (altmap)
map_offset = vmem_altmap_offset(altmap);
}
if (is_dev_zone(zone))
map_offset = vmem_altmap_offset(altmap);
clear_zone_contiguous(zone);