[PATCH] Get rid of "double zeroing" of allocated pages

Simplify the few instances where a call to "get_zeroed_page()" is closely
followed by an unnecessary call to memset() to clear that page.
Signed-off-by: NRobert P. J. Day <rpjday@mindspring.com>
Cc: chas williams <chas@cmf.nrl.navy.mil>
Acked-by: NMauro Carvalho Chehab <mchehab@infradead.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/atm/eni.c

@@ -912,7 +912,6 @@ static int start_rx(struct atm_dev *dev)
 		free_page((unsigned long) eni_dev->free_list);
 		return -ENOMEM;
 	}
-	memset(eni_dev->rx_map,0,PAGE_SIZE);
 	eni_dev->rx_mult = DEFAULT_RX_MULT;
 	eni_dev->fast = eni_dev->last_fast = NULL;
 	eni_dev->slow = eni_dev->last_slow = NULL;

drivers/media/video/zoran_driver.c

@@ -562,7 +562,6 @@ jpg_fbuffer_alloc (struct file *file)
 			jpg_fbuffer_free(file);
 			return -ENOBUFS;
 		}
-		memset((void *) mem, 0, PAGE_SIZE);
 		fh->jpg_buffers.buffer[i].frag_tab = (u32 *) mem;
 		fh->jpg_buffers.buffer[i].frag_tab_bus =
 		    virt_to_bus((void *) mem);

drivers/scsi/53c7xx.c

@@ -3099,7 +3099,6 @@ allocate_cmd (Scsi_Cmnd *cmd) {
         real = get_zeroed_page(GFP_ATOMIC);
         if (real == 0)
         	return NULL;
-        memset((void *)real, 0, 4096);
         cache_push(virt_to_phys((void *)real), 4096);
         cache_clear(virt_to_phys((void *)real), 4096);
         kernel_set_cachemode((void *)real, 4096, IOMAP_NOCACHE_SER);