mm/truncate: fix truncation for pages of arbitrary size
Remove the assumption that a compound page is HPAGE_PMD_SIZE, and the assumption that any page is PAGE_SIZE. Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Reviewed-by: NSeongJae Park <sjpark@amazon.de> Acked-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Huang Ying <ying.huang@intel.com> Link: https://lkml.kernel.org/r/20200908195539.25896-10-willy@infradead.orgSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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