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authorMatthew Wilcox <willy@infradead.org>2018-01-31 16:17:36 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 17:18:37 -0800
commit977fbdcd5986c9ff700bf276644d2b1973a53348 (patch)
tree312bd6dd7f6a528759dad4b2da27eaf9ff339b12 /mm/khugepaged.c
parenta365ac09d334389bc69841c9d153f03fa2442f1c (diff)
mm: add unmap_mapping_pages()
Several users of unmap_mapping_range() would prefer to express their range in pages rather than bytes. Unfortuately, on a 32-bit kernel, you have to remember to cast your page number to a 64-bit type before shifting it, and four places in the current tree didn't remember to do that. That's a sign of a bad interface. Conveniently, unmap_mapping_range() actually converts from bytes into pages, so hoist the guts of unmap_mapping_range() into a new function unmap_mapping_pages() and convert the callers which want to use pages. Link: http://lkml.kernel.org/r/20171206142627.GD32044@bombadil.infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Reported-by: "zhangyi (F)" <yi.zhang@huawei.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.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 'mm/khugepaged.c')
-rw-r--r--mm/khugepaged.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index ea4ff259b671..1cd18e4347fe 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1399,8 +1399,7 @@ static void collapse_shmem(struct mm_struct *mm,
}
if (page_mapped(page))
- unmap_mapping_range(mapping, index << PAGE_SHIFT,
- PAGE_SIZE, 0);
+ unmap_mapping_pages(mapping, index, 1, false);
spin_lock_irq(&mapping->tree_lock);