[PATCH v3 1/8] mm/hwpoison: fix lose PG_dirty flag for errors on mlocked pages

memory_failure() store the page flag of the error page before doing unmap, and (only) if the first check with page flags at the time decided the error page is unknown, it do the second check with the stored page flag since memory_failure() does unmapping of the error pages before doing

[PATCH v3 1/8] mm/hwpoison: fix lose PG_dirty flag for errors on mlocked pages

memory_failure() store the page flag of the error page before doing unmap, and (only) if the first check with page flags at the time decided the error page is unknown, it do the second check with the stored page flag since memory_failure() does unmapping of the error pages before doing