From e24500193bc39ef197d9f96af5850e7345fed84d Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Sun, 23 Nov 2008 11:46:58 +0100 Subject: [PATCH] arch/avr32: 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/) // @@ 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); // Signed-off-by: Julia Lawall Signed-off-by: Haavard Skinnemoen --- arch/avr32/mm/init.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c index fa92ff6d95f..e819fa69a90 100644 --- a/arch/avr32/mm/init.c +++ b/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); }