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Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h14
1 files changed, 10 insertions, 4 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3bedc449c14d..21f8b27bd9fd 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1544,9 +1544,16 @@ static inline bool is_longterm_pinnable_page(struct page *page)
if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE)
return false;
#endif
- return !(is_device_coherent_page(page) ||
- is_zone_movable_page(page) ||
- is_zero_pfn(page_to_pfn(page)));
+ /* The zero page may always be pinned */
+ if (is_zero_pfn(page_to_pfn(page)))
+ return true;
+
+ /* Coherent device memory must always allow eviction. */
+ if (is_device_coherent_page(page))
+ return false;
+
+ /* Otherwise, non-movable zone pages can be pinned. */
+ return !is_zone_movable_page(page);
}
#else
static inline bool is_longterm_pinnable_page(struct page *page)
@@ -2885,7 +2892,6 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
#define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
#define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
#define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
-#define FOLL_COW 0x4000 /* internal GUP flag */
#define FOLL_ANON 0x8000 /* don't do file mappings */
#define FOLL_LONGTERM 0x10000 /* mapping lifetime is indefinite: see below */
#define FOLL_SPLIT_PMD 0x20000 /* split huge pmd before returning */