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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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5
mm/page_alloc.c
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@@ -5853,6 +5853,7 @@ void __ref memmap_init_zone_device(struct zone *zone,
{
unsigned long pfn, end_pfn = start_pfn + size;
struct pglist_data *pgdat = zone->zone_pgdat;
struct vmem_altmap *altmap = pgmap_altmap(pgmap);
unsigned long zone_idx = zone_idx(zone);
unsigned long start = jiffies;
int nid = pgdat->node_id;
@@ -5865,9 +5866,7 @@ void __ref memmap_init_zone_device(struct zone *zone,
* of the pages reserved for the memmap, so we can just jump to
* the end of that region and start processing the device pages.
*/
if (pgmap->altmap_valid) {
struct vmem_altmap *altmap = &pgmap->altmap;
if (altmap) {
start_pfn = altmap->base_pfn + vmem_altmap_offset(altmap);
size = end_pfn - start_pfn;
}