From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755257AbYKUKkk (ORCPT ); Fri, 21 Nov 2008 05:40:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752110AbYKUKkb (ORCPT ); Fri, 21 Nov 2008 05:40:31 -0500 Received: from ozlabs.org ([203.10.76.45]:56307 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751308AbYKUKkb (ORCPT ); Fri, 21 Nov 2008 05:40:31 -0500 To: Adam Belay From: Rusty Russell Date: Fri, 21 Nov 2008 21:10:25 +1030 Subject: [PATCH 2/3] percpu: fix percpu accessors to potentially !cpu_possible() cpus: pnpbios Cc: Mike Travis , Ingo Molnar , linux-kernel@vger.kernel.org Cc: Ingo Molnar Cc: Adam Belay MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200811212110.25549.rusty@rustcorp.com.au> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Impact: CPU iterator bugfixes Percpu areas are only allocated for possible cpus. In general, you shouldn't access random cpu's percpu areas. Signed-off-by: Rusty Russell Signed-off-by: Mike Travis Acked-by: Ingo Molnar Cc: Adam Belay --- drivers/pnp/pnpbios/bioscalls.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -r --- test-compile.orig/drivers/pnp/pnpbios/bioscalls.c +++ test-compile/drivers/pnp/pnpbios/bioscalls.c @@ -481,7 +481,7 @@ void pnpbios_calls_init(union pnp_bios_i set_base(bad_bios_desc, __va((unsigned long)0x40 << 4)); _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4)); - for (i = 0; i < NR_CPUS; i++) { + for_each_possible_cpu(i) { struct desc_struct *gdt = get_cpu_gdt_table(i); if (!gdt) continue;