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authorJulia Lawall <julia@diku.dk>2008-07-17 21:16:33 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-20 17:24:40 -0700
commit7b6b948fc0d60a704c15b1cd72345a98e759dd62 (patch)
tree0e111fa2eb1a658289c40b7bb64fd481555ef1ef
parent3fadd06ebcbff9b0a7c90f68d81250f39bf31db1 (diff)
arch/m68k/mm/motorola.c: Eliminate NULL test and memset after alloc_bootmem
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 = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...) .. when != E ( - BUG_ON (E == NULL); | - if (E == NULL) S ) @@ expression E,E1; @@ E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...) .. when != E - memset(E,0,E1); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/m68k/mm/motorola.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 30d34f2..226795b 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -285,7 +285,6 @@ void __init paging_init(void)
* to a couple of allocated pages
*/
empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
- memset(empty_zero_page, 0, PAGE_SIZE);
/*
* Set up SFC/DFC registers