From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763123AbYAQW5J (ORCPT ); Thu, 17 Jan 2008 17:57:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762616AbYAQWyU (ORCPT ); Thu, 17 Jan 2008 17:54:20 -0500 Received: from rv-out-0910.google.com ([209.85.198.186]:11849 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762614AbYAQWyS (ORCPT ); Thu, 17 Jan 2008 17:54:18 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:content-type:date:message-id:mime-version:x-mailer:content-transfer-encoding; b=cEQZK5YE1IZYJ07imqh3ZDsPvNk/346pUfiE/nbAdO7fi35IcZHVax1O2bNMeipRUi0HlzrkmvJ74b+3y/SmhRqJsTHqY6IpIoNjXJ/+TLV0dACCt2JFROYOWm47mO9tDv2BbcXU8nQsfam8jHizYgpX09jBdCVerSm6MSYyk1k= Subject: [PATCH 1/2] x86: add is_f00f_bug helper to fault_32|64.c From: Harvey Harrison To: Ingo Molnar Cc: "H. Peter Anvin" , LKML , Thomas Gleixner Content-Type: text/plain Date: Thu, 17 Jan 2008 14:54:16 -0800 Message-Id: <1200610456.5724.41.camel@brick> Mime-Version: 1.0 X-Mailer: Evolution 2.12.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Further towards unifying these files, add another helper in same spirit as is_errata93. Signed-off-by: Harvey Harrison --- Incorporated HPA's suggestion of unconditional prototype for do_invalid_op. arch/x86/mm/fault_32.c | 39 ++++++++++++++++++++++----------------- arch/x86/mm/fault_64.c | 24 ++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 17 deletions(-) diff --git a/arch/x86/mm/fault_32.c b/arch/x86/mm/fault_32.c index 936bb0c..dae4f69 100644 --- a/arch/x86/mm/fault_32.c +++ b/arch/x86/mm/fault_32.c @@ -211,8 +211,6 @@ void dump_pagetable(unsigned long address) printk("\n"); } -void do_invalid_op(struct pt_regs *, unsigned long); - static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address) { unsigned index = pgd_index(address); @@ -288,6 +286,26 @@ static int is_errata93(struct pt_regs *regs, unsigned long address) return 0; } +void do_invalid_op(struct pt_regs *, unsigned long); + +static int is_f00f_bug(struct pt_regs *regs, unsigned long address) +{ +#ifdef CONFIG_X86_F00F_BUG + unsigned long nr; + /* + * Pentium F0 0F C7 C8 bug workaround. + */ + if (boot_cpu_data.f00f_bug) { + nr = (address - idt_descr.address) >> 3; + + if (nr == 6) { + do_invalid_op(regs, 0); + return 1; + } + } +#endif + return 0; +} /* * Handle a fault on the vmalloc or module mapping area @@ -570,21 +588,8 @@ bad_area_nosemaphore: return; } -#ifdef CONFIG_X86_F00F_BUG - /* - * Pentium F0 0F C7 C8 bug workaround. - */ - if (boot_cpu_data.f00f_bug) { - unsigned long nr; - - nr = (address - idt_descr.address) >> 3; - - if (nr == 6) { - do_invalid_op(regs, 0); - return; - } - } -#endif + if (is_f00f_bug(regs, address)) + return; no_context: /* Are we prepared to handle this kernel fault? */ diff --git a/arch/x86/mm/fault_64.c b/arch/x86/mm/fault_64.c index cde110c..ce1a870 100644 --- a/arch/x86/mm/fault_64.c +++ b/arch/x86/mm/fault_64.c @@ -256,6 +256,27 @@ static int is_errata93(struct pt_regs *regs, unsigned long address) return 0; } +void do_invalid_op(struct pt_regs *, unsigned long); + +static int is_f00f_bug(struct pt_regs *regs, unsigned long address) +{ +#ifdef CONFIG_X86_F00F_BUG + unsigned long nr; + /* + * Pentium F0 0F C7 C8 bug workaround. + */ + if (boot_cpu_data.f00f_bug) { + nr = (address - idt_descr.address) >> 3; + + if (nr == 6) { + do_invalid_op(regs, 0); + return 1; + } + } +#endif + return 0; +} + static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs, unsigned long error_code) { @@ -572,6 +593,9 @@ bad_area_nosemaphore: return; } + if (is_f00f_bug(regs, address)) + return; + no_context: /* Are we prepared to handle this kernel fault? */ if (fixup_exception(regs)) -- 1.5.4.rc2.1164.g6451