Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753581AbcD1Up3 (ORCPT ); Thu, 28 Apr 2016 16:45:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55576 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752388AbcD1Up0 (ORCPT ); Thu, 28 Apr 2016 16:45:26 -0400 From: Josh Poimboeuf To: Jessica Yu , Jiri Kosina , Miroslav Benes , Ingo Molnar , Peter Zijlstra , Michael Ellerman , Heiko Carstens Cc: live-patching@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Vojtech Pavlik , Jiri Slaby , Petr Mladek , Chris J Arges , Andy Lutomirski Subject: [RFC PATCH v2 10/18] livepatch/powerpc: add TIF_PATCH_PENDING thread flag Date: Thu, 28 Apr 2016 15:44:41 -0500 Message-Id: <948131afc5d1e0fab00e78287a665d7b383cf884.1461875890.git.jpoimboe@redhat.com> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2612 Lines: 67 Add the TIF_PATCH_PENDING thread flag to enable the new livepatch per-task consistency model for powerpc. The bit getting set indicates the thread has a pending patch which needs to be applied when the thread exits the kernel. The bit is included in the _TIF_USER_WORK_MASK macro so that do_notify_resume() and klp_patch_task() get called when the bit is set. Signed-off-by: Josh Poimboeuf --- arch/powerpc/include/asm/thread_info.h | 4 +++- arch/powerpc/kernel/signal.c | 4 ++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 8febc3f..df262ca 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -88,6 +88,7 @@ static inline struct thread_info *current_thread_info(void) TIF_NEED_RESCHED */ #define TIF_32BIT 4 /* 32 bit binary */ #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ +#define TIF_PATCH_PENDING 6 /* pending live patching update */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SINGLESTEP 8 /* singlestepping active */ #define TIF_NOHZ 9 /* in adaptive nohz mode */ @@ -111,6 +112,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_POLLING_NRFLAG (1< #include #include +#include #include #include #include @@ -159,6 +160,9 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) tracehook_notify_resume(regs); } + if (thread_info_flags & _TIF_PATCH_PENDING) + klp_patch_task(current); + user_enter(); } -- 2.4.11