From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:39337 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933042AbcI0PES (ORCPT ); Tue, 27 Sep 2016 11:04:18 -0400 Subject: Patch "MIPS: Avoid a BUG warning during prctl(PR_SET_FP_MODE, ...)" has been added to the 4.4-stable tree To: marcin.nowakowski@imgtec.com, gregkh@linuxfoundation.org, ralf@linux-mips.org Cc: , From: Date: Tue, 27 Sep 2016 17:04:03 +0200 Message-ID: <1474988643210219@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 MIPS: Avoid a BUG warning during prctl(PR_SET_FP_MODE, ...) 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: mips-avoid-a-bug-warning-during-prctl-pr_set_fp_mode.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 b244614a60ab7ce54c12a9cbe15cfbf8d79d0967 Mon Sep 17 00:00:00 2001 From: Marcin Nowakowski Date: Wed, 31 Aug 2016 12:33:23 +0200 Subject: MIPS: Avoid a BUG warning during prctl(PR_SET_FP_MODE, ...) From: Marcin Nowakowski commit b244614a60ab7ce54c12a9cbe15cfbf8d79d0967 upstream. cpu_has_fpu macro uses smp_processor_id() and is currently executed with preemption enabled, that triggers the warning at runtime. It is assumed throughout the kernel that if any CPU has an FPU, then all CPUs would have an FPU as well, so it is safe to perform the check with preemption enabled - change the code to use raw_ variant of the check to avoid the warning. Signed-off-by: Marcin Nowakowski Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14125/ Signed-off-by: Ralf Baechle Signed-off-by: Greg Kroah-Hartman --- arch/mips/kernel/process.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -593,14 +593,14 @@ int mips_set_process_fp_mode(struct task return -EOPNOTSUPP; /* Avoid inadvertently triggering emulation */ - if ((value & PR_FP_MODE_FR) && cpu_has_fpu && - !(current_cpu_data.fpu_id & MIPS_FPIR_F64)) + if ((value & PR_FP_MODE_FR) && raw_cpu_has_fpu && + !(raw_current_cpu_data.fpu_id & MIPS_FPIR_F64)) return -EOPNOTSUPP; - if ((value & PR_FP_MODE_FRE) && cpu_has_fpu && !cpu_has_fre) + if ((value & PR_FP_MODE_FRE) && raw_cpu_has_fpu && !cpu_has_fre) return -EOPNOTSUPP; /* FR = 0 not supported in MIPS R6 */ - if (!(value & PR_FP_MODE_FR) && cpu_has_fpu && cpu_has_mips_r6) + if (!(value & PR_FP_MODE_FR) && raw_cpu_has_fpu && cpu_has_mips_r6) return -EOPNOTSUPP; /* Proceed with the mode switch */ Patches currently in stable-queue which might be from marcin.nowakowski@imgtec.com are queue-4.4/mips-avoid-a-bug-warning-during-prctl-pr_set_fp_mode.patch