The patch titled
Get rid of "double zeroing" of allocated pages
has been added to the -mm tree. Its filename is
get-rid-of-double-zeroing-of-allocated-pages.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Get rid of "double zeroing" of allocated pages
From: "Robert P. J. Day" <rpjday@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Cc: chas williams <chas@xxxxxxxxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/atm/eni.c | 1 -
drivers/media/video/zoran_driver.c | 1 -
drivers/scsi/53c7xx.c | 1 -
3 files changed, 3 deletions(-)
diff -puN drivers/atm/eni.c~get-rid-of-double-zeroing-of-allocated-pages drivers/atm/eni.c
--- a/drivers/atm/eni.c~get-rid-of-double-zeroing-of-allocated-pages
+++ a/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 -puN drivers/media/video/zoran_driver.c~get-rid-of-double-zeroing-of-allocated-pages drivers/media/video/zoran_driver.c
--- a/drivers/media/video/zoran_driver.c~get-rid-of-double-zeroing-of-allocated-pages
+++ a/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 -puN drivers/scsi/53c7xx.c~get-rid-of-double-zeroing-of-allocated-pages drivers/scsi/53c7xx.c
--- a/drivers/scsi/53c7xx.c~get-rid-of-double-zeroing-of-allocated-pages
+++ a/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);
_
Patches currently in -mm which might be from rpjday@xxxxxxxxxxxxxx are
git-alsa.patch
ppc-use-syslog-macro-for-the-printk-log-level.patch
rewrite-unnecessary-duplicated-code-to-use-field_sizeof.patch
transform-kmem_cache_allocmemset0-kmem_cache_zalloc.patch
simplify-some-code-to-use-the-container_of-macro.patch
get-rid-of-double-zeroing-of-allocated-pages.patch
oss-replace-kmallocmemset-combos-with-kzalloc.patch
-
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