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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2019-09-23 15:34:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-24 15:54:08 -0700 |
| commit | a50b854e073cd3335bbbada8dcff83a857297dd7 (patch) | |
| tree | 2ffc3a1e603860d6c0acc00154b47080c567c9c6 /lib/iov_iter.c | |
| parent | 1f18b296699c83d858ca8ebb8b77dbc641d87cae (diff) | |
| download | lwn-a50b854e073cd3335bbbada8dcff83a857297dd7.tar.gz lwn-a50b854e073cd3335bbbada8dcff83a857297dd7.zip | |
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 'lib/iov_iter.c')
| -rw-r--r-- | lib/iov_iter.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c index f1e0569b4539..639d5e7014c1 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -878,7 +878,7 @@ static inline bool page_copy_sane(struct page *page, size_t offset, size_t n) head = compound_head(page); v += (page - head) << PAGE_SHIFT; - if (likely(n <= v && v <= (PAGE_SIZE << compound_order(head)))) + if (likely(n <= v && v <= (page_size(head)))) return true; WARN_ON(1); return false; |