From 93026e217b46b70f9719caf69e716fa3bbe1d20c Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Thu, 17 Jul 2008 21:16:34 +0200 Subject: [PATCH] arch/m68k/mm/sun3mmu.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/) // @@ 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); // Signed-off-by: Julia Lawall Signed-off-by: Geert Uytterhoeven Signed-off-by: Linus Torvalds --- arch/m68k/mm/sun3mmu.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/m68k/mm/sun3mmu.c b/arch/m68k/mm/sun3mmu.c index 6a6513aa1c..edceefc188 100644 --- a/arch/m68k/mm/sun3mmu.c +++ b/arch/m68k/mm/sun3mmu.c @@ -53,7 +53,6 @@ void __init paging_init(void) wp_works_ok = 0; #endif empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); - memset(empty_zero_page, 0, PAGE_SIZE); address = PAGE_OFFSET; pg_dir = swapper_pg_dir; -- 2.39.5