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| author |   Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-08-14 17:30:33 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-14 19:56:56 -0700 |
| commit | af3bbc12df80e8c279b94c752b6edca29841f4f5 (patch) | |
| tree | 5e69277956e96fe4ccce71613db1f66dd13b1441 /include | |
| parent | mm: add thp_order (diff) | |
| download | wireguard-linux-af3bbc12df80e8c279b94c752b6edca29841f4f5.tar.xz wireguard-linux-af3bbc12df80e8c279b94c752b6edca29841f4f5.zip | |
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.h | 11 |
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 */ |