[PATCH] mm: pfault optimisation

This atomic operation is superfluous: the pte will be added with the
referenced bit set, and the page will be referenced through this mapping after
the page fault handler returns anyway.
Signed-off-by: NNick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

mm/memory.c

@@ -1977,7 +1977,6 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
 			goto release;
 		inc_mm_counter(mm, anon_rss);
 		lru_cache_add_active(page);
-		SetPageReferenced(page);
 		page_add_new_anon_rmap(page, vma, address);
 	} else {
 		/* Map the ZERO_PAGE - vm_page_prot is readonly */