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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-08-14 17:30:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-14 19:56:56 -0700
commitaf3bbc12df80e8c279b94c752b6edca29841f4f5 (patch)
tree5e69277956e96fe4ccce71613db1f66dd13b1441 /include
parent6ffbb45826f5d9ae09aa60cd88594b7816c96190 (diff)
mm: add thp_size
This function returns the number of bytes in a THP. It is like page_size(), but compiles to just PAGE_SIZE if CONFIG_TRANSPARENT_HUGEPAGE is disabled. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Reviewed-by: Zi Yan <ziy@nvidia.com> Cc: David Hildenbrand <david@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Link: http://lkml.kernel.org/r/20200629151959.15779-5-willy@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/huge_mm.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 9521cfdf18ca..9b33ac774fdd 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -462,4 +462,15 @@ static inline bool thp_migration_supported(void)
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+/**
+ * thp_size - Size of a transparent huge page.
+ * @page: Head page of a transparent huge page.
+ *
+ * Return: Number of bytes in this page.
+ */
+static inline unsigned long thp_size(struct page *page)
+{
+ return PAGE_SIZE << thp_order(page);
+}
+
#endif /* _LINUX_HUGE_MM_H */