From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757686AbdJLXGR (ORCPT ); Thu, 12 Oct 2017 19:06:17 -0400 Received: from mail.efficios.com ([167.114.142.141]:40618 "EHLO mail.efficios.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753655AbdJLXEK (ORCPT ); Thu, 12 Oct 2017 19:04:10 -0400 From: Mathieu Desnoyers To: "Paul E. McKenney" , Boqun Feng , Peter Zijlstra , Paul Turner , Andrew Hunter , Andy Lutomirski , Dave Watson , Josh Triplett , Will Deacon Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH for 4.15 07/14] Restartable sequences: powerpc architecture support Date: Thu, 12 Oct 2017 19:03:19 -0400 Message-Id: <20171012230326.19984-8-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171012230326.19984-1-mathieu.desnoyers@efficios.com> References: <20171012230326.19984-1-mathieu.desnoyers@efficios.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Boqun Feng Call the rseq_handle_notify_resume() function on return to userspace if TIF_NOTIFY_RESUME thread flag is set. Increment the event counter and 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 81b0031f909f..816590f4a2eb 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -207,6 +207,7 @@ 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 e9436c5e1e09..17a994b801b1 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); @@ -161,6 +163,7 @@ 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); } if (thread_info_flags & _TIF_PATCH_PENDING) -- 2.11.0