readahead: use ilog2 instead of a while loop in page_cache_ra_order()

A while loop is used to adjust the new_order to be lower than the
ra->size. ilog2 could be used to do the same instead of using a loop.

ilog2 typically resolves to a bit scan reverse instruction. This is
particularly useful when ra->size is smaller than the 2^new_order as it
resolves in one instruction instead of looping to find the new_order.

No functional changes.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Pankaj Raghav <[e-mail]>
Cc: Matthew Wilcox (Oracle) <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

mm/readahead.c

···
 
 	if (new_order < MAX_PAGECACHE_ORDER) {
 		new_order += 2;
-		if (new_order > MAX_PAGECACHE_ORDER)
-			new_order = MAX_PAGECACHE_ORDER;
-		while ((1 << new_order) > ra->size)
-			new_order--;
+		new_order = min_t(unsigned int, MAX_PAGECACHE_ORDER, new_order);
+		new_order = min_t(unsigned int, new_order, ilog2(ra->size));
 	}
 
 	filemap_invalidate_lock_shared(mapping);