From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:44957 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751774AbcJDIU5 (ORCPT ); Tue, 4 Oct 2016 04:20:57 -0400 Subject: Patch "x86/boot: Initialize FPU and X86_FEATURE_ALWAYS even if we don't have CPUID" has been added to the 4.4-stable tree To: luto@kernel.org, bp@alien8.de, brgerst@gmail.com, dave@sr71.net, david@saggiorato.net, dvlasenk@redhat.com, gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, torvalds@linux-foundation.org Cc: , From: Date: Tue, 04 Oct 2016 10:17:02 +0200 Message-ID: <1475569022105130@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled x86/boot: Initialize FPU and X86_FEATURE_ALWAYS even if we don't have CPUID to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-boot-initialize-fpu-and-x86_feature_always-even-if-we-don-t-have-cpuid.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 05fb3c199bb09f5b85de56cc3ede194ac95c5e1f Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Wed, 28 Sep 2016 16:06:33 -0700 Subject: x86/boot: Initialize FPU and X86_FEATURE_ALWAYS even if we don't have CPUID From: Andy Lutomirski commit 05fb3c199bb09f5b85de56cc3ede194ac95c5e1f upstream. Otherwise arch_task_struct_size == 0 and we die. While we're at it, set X86_FEATURE_ALWAYS, too. Reported-by: David Saggiorato Tested-by: David Saggiorato Signed-off-by: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dave Hansen Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Fixes: aaeb5c01c5b ("x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86") Link: http://lkml.kernel.org/r/8de723afbf0811071185039f9088733188b606c9.1475103911.git.luto@kernel.org Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/cpu/common.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -737,21 +737,20 @@ static void __init early_identify_cpu(st identify_cpu_without_cpuid(c); /* cyrix could have cpuid enabled via c_identify()*/ - if (!have_cpuid_p()) - return; - - cpu_detect(c); - get_cpu_vendor(c); - get_cpu_cap(c); - - if (this_cpu->c_early_init) - this_cpu->c_early_init(c); - - c->cpu_index = 0; - filter_cpuid_features(c, false); - - if (this_cpu->c_bsp_init) - this_cpu->c_bsp_init(c); + if (have_cpuid_p()) { + cpu_detect(c); + get_cpu_vendor(c); + get_cpu_cap(c); + + if (this_cpu->c_early_init) + this_cpu->c_early_init(c); + + c->cpu_index = 0; + filter_cpuid_features(c, false); + + if (this_cpu->c_bsp_init) + this_cpu->c_bsp_init(c); + } setup_force_cpu_cap(X86_FEATURE_ALWAYS); fpu__init_system(c); Patches currently in stable-queue which might be from luto@kernel.org are queue-4.4/x86-init-fix-cr4_init_shadow-on-cr4-less-machines.patch queue-4.4/x86-boot-initialize-fpu-and-x86_feature_always-even-if-we-don-t-have-cpuid.patch