Commit 949b9325 authored by Dan Williams's avatar Dan Williams
Browse files

memremap: fix softlockup reports at teardown 

The cond_resched() currently in the setup path needs to be duplicated in
the teardown path. Rather than require each instance of
for_each_device_pfn() to open code the same sequence, embed it in the
helper.

Link: https://github.com/intel/ixpdimm_sw/issues/11


Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: <stable@vger.kernel.org>
Fixes: 71389703 ("mm, zone_device: Replace {get, put}_zone_device_page()...")
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 5fdf8e5b

kernel/memremap.c

+10 −5
Original line number Diff line number Diff line
@@ -275,8 +275,15 @@ static unsigned long pfn_end(struct dev_pagemap *pgmap) 
	return (res->start + resource_size(res)) >> PAGE_SHIFT;

}



static unsigned long pfn_next(unsigned long pfn)

{

	if (pfn % 1024 == 0)

		cond_resched();

	return pfn + 1;

}



#define for_each_device_pfn(pfn, map) \

	for (pfn = pfn_first(map); pfn < pfn_end(map); pfn++)

	for (pfn = pfn_first(map); pfn < pfn_end(map); pfn = pfn_next(pfn))



static void devm_memremap_pages_release(void *data)

{
@@ -337,10 +344,10 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) 
	resource_size_t align_start, align_size, align_end;

	struct vmem_altmap *altmap = pgmap->altmap_valid ?

			&pgmap->altmap : NULL;

	struct resource *res = &pgmap->res;

	unsigned long pfn, pgoff, order;

	pgprot_t pgprot = PAGE_KERNEL;

	int error, nid, is_ram, i = 0;

	struct resource *res = &pgmap->res;

	int error, nid, is_ram;



	align_start = res->start & ~(SECTION_SIZE - 1);

	align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
@@ -409,8 +416,6 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) 
		list_del(&page->lru);

		page->pgmap = pgmap;

		percpu_ref_get(pgmap->ref);

		if (!(++i % 1024))

			cond_resched();

	}



	devm_add_action(dev, devm_memremap_pages_release, pgmap);

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