zram: remove redundant checks from zram_recompress()

Size class index comparison is powerful enough so we can remove object
size comparisons.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Sergey Senozhatsky <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Cc: Alexey Romanov <[email protected]>
Cc: Nhat Pham <[email protected]>
Cc: Nitin Gupta <[email protected]>
Cc: Suleiman Souhlal <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

drivers/block/zram/zram_drv.c

@@ -1722,9 +1722,7 @@ static int zram_recompress(struct zram *zram, u32 index, struct page *page,
 							comp_len_new);
 
 		/* Continue until we make progress */
-		if (comp_len_new >= huge_class_size ||
-		    comp_len_new >= comp_len_old ||
-		    class_index_new >= class_index_old ||
+		if (class_index_new >= class_index_old ||
 		    (threshold && comp_len_new >= threshold)) {
 			zcomp_stream_put(zram->comps[prio]);
 			continue;
@@ -1747,9 +1745,7 @@ static int zram_recompress(struct zram *zram, u32 index, struct page *page,
 	 * that would save memory, mark the object as incompressible so that
 	 * we will not try to compress it again.
 	 */
-	if (comp_len_new >= huge_class_size ||
-	    comp_len_new >= comp_len_old ||
-	    class_index_new >= class_index_old) {
+	if (class_index_new >= class_index_old) {
 		zram_set_flag(zram, index, ZRAM_INCOMPRESSIBLE);
 		return 0;
 	}