From patchwork Sat Jun 2 12:44:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Desnoyers X-Patchwork-Id: 924489 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40ygvp6MwXz9s08 for ; Sat, 2 Jun 2018 22:47:34 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=efficios.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=efficios.com header.i=@efficios.com header.b="fB3FWo1s"; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 40ygvp4wVDzF189 for ; Sat, 2 Jun 2018 22:47:34 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=efficios.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=efficios.com header.i=@efficios.com header.b="fB3FWo1s"; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=efficios.com (client-ip=167.114.142.138; helo=mail.efficios.com; envelope-from=mathieu.desnoyers@efficios.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=efficios.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=efficios.com header.i=@efficios.com header.b="fB3FWo1s"; dkim-atps=neutral Received: from mail.efficios.com (mail.efficios.com [167.114.142.138]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40ygrX49L1zF13F for ; Sat, 2 Jun 2018 22:44:41 +1000 (AEST) Received: from localhost (ip6-localhost [IPv6:::1]) by mail.efficios.com (Postfix) with ESMTP id 06F711A85F4; Sat, 2 Jun 2018 08:44:28 -0400 (EDT) Received: from mail.efficios.com ([IPv6:::1]) by localhost (mail02.efficios.com [IPv6:::1]) (amavisd-new, port 10032) with ESMTP id QP10MdBSMaHn; Sat, 2 Jun 2018 08:44:27 -0400 (EDT) Received: from localhost (ip6-localhost [IPv6:::1]) by mail.efficios.com (Postfix) with ESMTP id 4E25D1A85F0; Sat, 2 Jun 2018 08:44:27 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.efficios.com 4E25D1A85F0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=efficios.com; s=default; t=1527943467; bh=rEVtjE6zviaS4yyQpk5TE5A5c0o4kOgnachun+l8FEs=; h=From:To:Date:Message-Id; b=fB3FWo1sgkWLwVn5blI3ugvzqBx/sDQ1Zkl29OKsTG4tgYvcAo01VDdefLrfBHbEf 4L2c4sGg/NpsRFNdXq2JfahJ+nOw0TqpN1wzOhRkeqby9xY3CdH6GrCbGBe3vGJN0j /xFQNvXU0PSf8qB8XTEtLe4PWp9oDUNyzPEBBwxaOZa+MCVckXdUtORM67j4DVCG9v m3+kpE2wew6sJ58Bo3cIGvQtQhP8QtXd4VDkbVqU99BpwZkiXr2jgTHv79yrMecwAL QqUc5o6ws8wbJmfH5hPOZbQfgDuAcm+JP+w84RBj7J10icADQTfFTaZU1rxccFhHjU 0UOyPgHpfc6hA== X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([IPv6:::1]) by localhost (mail02.efficios.com [IPv6:::1]) (amavisd-new, port 10026) with ESMTP id VfvpxcAngYp8; Sat, 2 Jun 2018 08:44:27 -0400 (EDT) Received: from thinkos.etherlink (192-222-157-41.qc.cable.ebox.net [192.222.157.41]) by mail.efficios.com (Postfix) with ESMTPSA id 38E551A85E3; Sat, 2 Jun 2018 08:44:26 -0400 (EDT) From: Mathieu Desnoyers To: Peter Zijlstra , "Paul E . McKenney" , Boqun Feng , Andy Lutomirski , Dave Watson Subject: [RFC PATCH for 4.18 08/16] powerpc: Add support for restartable sequences Date: Sat, 2 Jun 2018 08:44:00 -0400 Message-Id: <20180602124408.8430-9-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180602124408.8430-1-mathieu.desnoyers@efficios.com> References: <20180602124408.8430-1-mathieu.desnoyers@efficios.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Joel Fernandes , Will Deacon , Andi Kleen , Paul Mackerras , "H . Peter Anvin" , Chris Lameter , Russell King , Andrew Hunter , Ingo Molnar , Michael Kerrisk , Catalin Marinas , Paul Turner , Josh Triplett , Steven Rostedt , Ben Maurer , Mathieu Desnoyers , Thomas Gleixner , linux-api@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Andrew Morton , Linus Torvalds Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Boqun Feng Call the rseq_handle_notify_resume() function on return to userspace if TIF_NOTIFY_RESUME thread flag is set. Perform fixup on the pre-signal when a signal is delivered on top of a restartable sequence critical section. Signed-off-by: Boqun Feng Signed-off-by: Mathieu Desnoyers CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Michael Ellerman CC: Peter Zijlstra CC: "Paul E. McKenney" CC: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/Kconfig | 1 + arch/powerpc/kernel/signal.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c32a181a7cbb..ed21a777e8c6 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -223,6 +223,7 @@ config PPC select HAVE_SYSCALL_TRACEPOINTS select HAVE_VIRT_CPU_ACCOUNTING select HAVE_IRQ_TIME_ACCOUNTING + select HAVE_RSEQ select IRQ_DOMAIN select IRQ_FORCED_THREADING select MODULES_USE_ELF_RELA diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index 61db86ecd318..d3bb3aaaf5ac 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -133,6 +133,8 @@ static void do_signal(struct task_struct *tsk) /* Re-enable the breakpoints for the signal stack */ thread_change_pc(tsk, tsk->thread.regs); + rseq_signal_deliver(tsk->thread.regs); + if (is32) { if (ksig.ka.sa.sa_flags & SA_SIGINFO) ret = handle_rt_signal32(&ksig, oldset, tsk); @@ -164,6 +166,7 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) if (thread_info_flags & _TIF_NOTIFY_RESUME) { clear_thread_flag(TIF_NOTIFY_RESUME); tracehook_notify_resume(regs); + rseq_handle_notify_resume(regs); } user_enter();