From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758395AbYKWKs3 (ORCPT ); Sun, 23 Nov 2008 05:48:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756601AbYKWKsU (ORCPT ); Sun, 23 Nov 2008 05:48:20 -0500 Received: from mgw1.diku.dk ([130.225.96.91]:59978 "EHLO mgw1.diku.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755883AbYKWKsT (ORCPT ); Sun, 23 Nov 2008 05:48:19 -0500 Date: Sun, 23 Nov 2008 11:48:14 +0100 (CET) From: Julia Lawall To: tony.luck@intel.com, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH 3/5] arch/ia64: Eliminate NULL test and memset after alloc_bootmem Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Julia Lawall 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 --- arch/ia64/sn/kernel/setup.c | 5 +---- 1 files changed, 1 insertions(+), 4 deletions(-) diff --git a/arch/ia64/sn/kernel/setup.c b/arch/ia64/sn/kernel/setup.c index bb1d249..b683eb3 100644 --- a/arch/ia64/sn/kernel/setup.c +++ b/arch/ia64/sn/kernel/setup.c @@ -512,7 +512,6 @@ static void __init sn_init_pdas(char **cmdline_p) for_each_online_node(cnode) { nodepdaindr[cnode] = alloc_bootmem_node(NODE_DATA(cnode), sizeof(nodepda_t)); - memset(nodepdaindr[cnode], 0, sizeof(nodepda_t)); memset(nodepdaindr[cnode]->phys_cpuid, -1, sizeof(nodepdaindr[cnode]->phys_cpuid)); spin_lock_init(&nodepdaindr[cnode]->ptc_lock); @@ -521,11 +520,9 @@ static void __init sn_init_pdas(char **cmdline_p) /* * Allocate & initialize nodepda for TIOs. For now, put them on node 0. */ - for (cnode = num_online_nodes(); cnode < num_cnodes; cnode++) { + for (cnode = num_online_nodes(); cnode < num_cnodes; cnode++) nodepdaindr[cnode] = alloc_bootmem_node(NODE_DATA(0), sizeof(nodepda_t)); - memset(nodepdaindr[cnode], 0, sizeof(nodepda_t)); - } /* * Now copy the array of nodepda pointers to each nodepda.