[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: Robert P. J. Day <rpjday@mindspring.com>
Cc: chas williams <chas@cmf.nrl.navy.mil>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 0 insertions, 3 deletions

diff --git a/drivers/atm/eni.c b/drivers/atm/eni.c
index 5aab7bd473ac..8fccf018f165 100644
--- a/drivers/atm/eni.c
+++ b/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;
diff --git a/drivers/media/video/zoran_driver.c b/drivers/media/video/zoran_driver.c
index 862a984c2155..e10a9ee25fc5 100644
--- a/drivers/media/video/zoran_driver.c
+++ b/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);
diff --git a/drivers/scsi/53c7xx.c b/drivers/scsi/53c7xx.c
index 640536ef77dc..9c3794310879 100644
--- a/drivers/scsi/53c7xx.c
+++ b/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);