From: Mathieu Desnoyers <mathieu.desnoyers@efficios•com>
To: Peter Zijlstra <peterz@infradead•org>,
"Paul E . McKenney" <paulmck@linux•vnet.ibm.com>,
Boqun Feng <boqun.feng@gmail•com>,
Andy Lutomirski <luto@amacapital•net>,
Dave Watson <davejwatson@fb•com>
Cc: linux-kernel@vger•kernel.org, linux-api@vger•kernel.org,
Paul Turner <pjt@google•com>,
Andrew Morton <akpm@linux-foundation•org>,
Russell King <linux@arm•linux.org.uk>,
Thomas Gleixner <tglx@linutronix•de>,
Ingo Molnar <mingo@redhat•com>, "H . Peter Anvin" <hpa@zytor•com>,
Andrew Hunter <ahh@google•com>, Andi Kleen <andi@firstfloor•org>,
Chris Lameter <cl@linux•com>, Ben Maurer <bmaurer@fb•com>,
Steven Rostedt <rostedt@goodmis•org>,
Josh Triplett <josh@joshtriplett•org>,
Linus Torvalds <torvalds@linux-foundation•org>,
Catalin Marinas <catalin.marinas@arm•com>,
Will Deacon <will.deacon@arm•com>,
Michael Kerrisk <mtk.manpages@gmail•com>,
Joel Fernandes <joelaf@google•com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios•com>,
Benjamin Herrenschmidt <benh@kernel•crashing.org>,
Paul Mackerras <paulus@samba•org>,
Michael Ellerman <mpe@ellerman•id.au>,
linuxppc-dev@lists•ozlabs.org
Subject: [PATCH 07/14] powerpc: Add support for restartable sequences
Date: Mon, 30 Apr 2018 18:44:26 -0400 [thread overview]
Message-ID: <20180430224433.17407-8-mathieu.desnoyers@efficios.com> (raw)
In-Reply-To: <20180430224433.17407-1-mathieu.desnoyers@efficios.com>
From: Boqun Feng <boqun.feng@gmail•com>
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 <boqun.feng@gmail•com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios•com>
CC: Benjamin Herrenschmidt <benh@kernel•crashing.org>
CC: Paul Mackerras <paulus@samba•org>
CC: Michael Ellerman <mpe@ellerman•id.au>
CC: Peter Zijlstra <peterz@infradead•org>
CC: "Paul E. McKenney" <paulmck@linux•vnet.ibm.com>
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();
--
2.11.0
next parent reply other threads:[~2018-04-30 22:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180430224433.17407-1-mathieu.desnoyers@efficios.com>
2018-04-30 22:44 ` Mathieu Desnoyers [this message]
2018-05-16 16:18 ` [PATCH 07/14] powerpc: Add support for restartable sequences Peter Zijlstra
2018-05-16 20:13 ` Mathieu Desnoyers
2018-05-17 1:19 ` Boqun Feng
2018-05-17 7:43 ` Peter Zijlstra
2018-05-17 15:28 ` Mathieu Desnoyers
2018-05-17 23:50 ` Boqun Feng
2018-05-18 18:17 ` Mathieu Desnoyers
2018-05-20 14:08 ` Boqun Feng
2018-05-23 20:14 ` Mathieu Desnoyers
2018-05-23 20:46 ` Paul E. McKenney
2018-05-23 21:29 ` Mathieu Desnoyers
2018-05-24 1:03 ` Michael Ellerman
2018-05-28 7:00 ` Mathieu Desnoyers
2018-05-18 12:38 ` Michael Ellerman
2018-04-30 22:44 ` [PATCH 08/14] powerpc: Wire up restartable sequences system call Mathieu Desnoyers
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