The patch titled
arch/avr32: eliminate NULL test and memset after alloc_bootmem
has been added to the -mm tree. Its filename is
arch-avr32-eliminate-null-test-and-memset-after-alloc_bootmem.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: arch/avr32: eliminate NULL test and memset after alloc_bootmem
From: Julia Lawall <julia@xxxxxxx>
As noted by Akinobu Mita in patch b1fceac2b9e04d278316b2faddf276015fc06e3b,
alloc_bootmem and related functions never return NULL and always return a
zeroed region of memory. Thus a NULL test or memset after calls to these
functions is unnecessary.
This was fixed using the following semantic patch.
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@@
expression E;
statement S;
@@
E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\|alloc_bootmem_node\|alloc_bootmem_low_pages_node\|alloc_bootmem_pages_node\)(...)
... when != E
(
- BUG_ON (E == NULL);
|
- if (E == NULL) S
)
@@
expression E,E1;
@@
E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\|alloc_bootmem_node\|alloc_bootmem_low_pages_node\|alloc_bootmem_pages_node\)(...)
... when != E
- memset(E,0,E1);
// </smpl>
Signed-off-by: Julia Lawall <julia@xxxxxxx>
Cc: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/avr32/mm/init.c | 1 -
1 file changed, 1 deletion(-)
diff -puN arch/avr32/mm/init.c~arch-avr32-eliminate-null-test-and-memset-after-alloc_bootmem arch/avr32/mm/init.c
--- a/arch/avr32/mm/init.c~arch-avr32-eliminate-null-test-and-memset-after-alloc_bootmem
+++ a/arch/avr32/mm/init.c
@@ -97,7 +97,6 @@ void __init paging_init(void)
mem_map = NODE_DATA(0)->node_mem_map;
- memset(zero_page, 0, PAGE_SIZE);
empty_zero_page = virt_to_page(zero_page);
flush_dcache_page(empty_zero_page);
}
_
Patches currently in -mm which might be from julia@xxxxxxx are
linux-next.patch
drivers-char-agp-add-missing-pci_dev_get.patch
drivers-mtd-maps-nettelc-use-array_size.patch
net-tipc-bcasth-use-array_size.patch
drivers-isdn-misdn-use-array_size.patch
drivers-pci-hotplug-add-missing-pci_dev_get.patch
drivers-message-fusion-use-array_size.patch
fs-namespacec-drop-code-after-return.patch
arch-arm-eliminate-null-test-and-memset-after-alloc_bootmem.patch
arch-avr32-eliminate-null-test-and-memset-after-alloc_bootmem.patch
arch-ia64-eliminate-null-test-and-memset-after-alloc_bootmem.patch
arch-powerpc-eliminate-null-test-and-memset-after-alloc_bootmem.patch
mm-page_allocc-eliminate-null-test-and-memset-after-alloc_bootmem.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
