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include/linux/hugetlb.h: add synchronization information for new hugetlb specific flags
Add comments, no functional change. Link: https://lkml.kernel.org/r/62a80585-2a73-10cc-4a2d-5721540d4ad2@oracle.com Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -480,14 +480,24 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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* HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
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* allocation time. Cleared when page is fully instantiated. Free
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* routine checks flag to restore a reservation on error paths.
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* Synchronization: Examined or modified by code that knows it has
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* the only reference to page. i.e. After allocation but before use
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* or when the page is being freed.
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* HPG_migratable - Set after a newly allocated page is added to the page
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* cache and/or page tables. Indicates the page is a candidate for
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* migration.
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* Synchronization: Initially set after new page allocation with no
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* locking. When examined and modified during migration processing
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* (isolate, migrate, putback) the hugetlb_lock is held.
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* HPG_temporary - - Set on a page that is temporarily allocated from the buddy
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* allocator. Typically used for migration target pages when no pages
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* are available in the pool. The hugetlb free page path will
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* immediately free pages with this flag set to the buddy allocator.
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* Synchronization: Can be set after huge page allocation from buddy when
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* code knows it has only reference. All other examinations and
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* modifications require hugetlb_lock.
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* HPG_freed - Set when page is on the free lists.
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* Synchronization: hugetlb_lock held for examination and modification.
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*/
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enum hugetlb_page_flags {
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HPG_restore_reserve = 0,
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