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authorMatthew Wilcox (Oracle) <willy@infradead.org>2019-09-24 01:34:25 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-09-25 01:54:08 +0300
commita50b854e073cd3335bbbada8dcff83a857297dd7 (patch)
tree2ffc3a1e603860d6c0acc00154b47080c567c9c6 /include
parent1f18b296699c83d858ca8ebb8b77dbc641d87cae (diff)
downloadlinux-a50b854e073cd3335bbbada8dcff83a857297dd7.tar.xz
mm: introduce page_size()
Patch series "Make working with compound pages easier", v2. These three patches add three helpers and convert the appropriate places to use them. This patch (of 3): It's unnecessarily hard to find out the size of a potentially huge page. Replace 'PAGE_SIZE << compound_order(page)' with page_size(page). Link: http://lkml.kernel.org/r/20190721104612.19120-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/hugetlb.h2
-rw-r--r--include/linux/mm.h6
2 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index edfca4278319..53fc34f930d0 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -454,7 +454,7 @@ static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
static inline struct hstate *page_hstate(struct page *page)
{
VM_BUG_ON_PAGE(!PageHuge(page), page);
- return size_to_hstate(PAGE_SIZE << compound_order(page));
+ return size_to_hstate(page_size(page));
}
static inline unsigned hstate_index_to_shift(unsigned index)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6e79b3df1582..d46d5585e2a2 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -805,6 +805,12 @@ static inline void set_compound_order(struct page *page, unsigned int order)
page[1].compound_order = order;
}
+/* Returns the number of bytes in this potentially compound page. */
+static inline unsigned long page_size(struct page *page)
+{
+ return PAGE_SIZE << compound_order(page);
+}
+
void free_compound_page(struct page *page);
#ifdef CONFIG_MMU