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mm: remove MEMORY_DEVICE_PUBLIC support

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The code hasn't been used since it was added to the tree, and doesn't
appear to actually be usable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Michal Hocko <mhocko@suse.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
2019-06-13 22:50:49 +02:00
committed by Jason Gunthorpe
parent 07ec38917e
commit 25b2995a35
14 changed files with 22 additions and 186 deletions
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28
mm/migrate.c
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@@ -246,8 +246,6 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
if (is_device_private_page(new)) {
entry = make_device_private_entry(new, pte_write(pte));
pte = swp_entry_to_pte(entry);
} else if (is_device_public_page(new)) {
pte = pte_mkdevmap(pte);
}
}
@@ -381,7 +379,6 @@ static int expected_page_refs(struct address_space *mapping, struct page *page)
* ZONE_DEVICE pages.
*/
expected_count += is_device_private_page(page);
expected_count += is_device_public_page(page);
if (mapping)
expected_count += hpage_nr_pages(page) + page_has_private(page);
@@ -994,10 +991,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
if (!PageMappingFlags(page))
page->mapping = NULL;
if (unlikely(is_zone_device_page(newpage))) {
if (is_device_public_page(newpage))
flush_dcache_page(newpage);
} else
if (likely(!is_zone_device_page(newpage)))
flush_dcache_page(newpage);
}
@@ -2265,7 +2259,7 @@ again:
pfn = 0;
goto next;
}
page = _vm_normal_page(migrate->vma, addr, pte, true);
page = vm_normal_page(migrate->vma, addr, pte);
mpfn = migrate_pfn(pfn) | MIGRATE_PFN_MIGRATE;
mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0;
}
@@ -2406,16 +2400,7 @@ static bool migrate_vma_check_page(struct page *page)
* FIXME proper solution is to rework migration_entry_wait() so
* it does not need to take a reference on page.
*/
if (is_device_private_page(page))
return true;
/*
* Only allow device public page to be migrated and account for
* the extra reference count imply by ZONE_DEVICE pages.
*/
if (!is_device_public_page(page))
return false;
extra++;
return is_device_private_page(page);
}
/* For file back page */
@@ -2665,11 +2650,6 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate,
swp_entry = make_device_private_entry(page, vma->vm_flags & VM_WRITE);
entry = swp_entry_to_pte(swp_entry);
} else if (is_device_public_page(page)) {
entry = pte_mkold(mk_pte(page, READ_ONCE(vma->vm_page_prot)));
if (vma->vm_flags & VM_WRITE)
entry = pte_mkwrite(pte_mkdirty(entry));
entry = pte_mkdevmap(entry);
}
} else {
entry = mk_pte(page, vma->vm_page_prot);
@@ -2789,7 +2769,7 @@ static void migrate_vma_pages(struct migrate_vma *migrate)
migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
continue;
}
} else if (!is_device_public_page(newpage)) {
} else {
/*
* Other types of ZONE_DEVICE page are not
* supported.