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mm: add thp_size

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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>
This commit is contained in:
Matthew Wilcox (Oracle)
2020-08-14 17:30:33 -07:00
committed by Linus Torvalds
parent 6ffbb45826
commit af3bbc12df
6 changed files with 18 additions and 11 deletions
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11
include/linux/huge_mm.h
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@@ -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 */