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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>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: [RFC PATCH for 4.15 02/14] Restartable sequences: ARM 32 architecture support
Date: Mon,  6 Nov 2017 15:56:32 -0500	[thread overview]
Message-ID: <20171106205644.29386-3-mathieu.desnoyers@efficios.com> (raw)
In-Reply-To: <20171106205644.29386-1-mathieu.desnoyers@efficios.com>

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 frame
when a signal is delivered on top of a restartable sequence critical
section.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Will Deacon <will.deacon@arm.com>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Paul Turner <pjt@google.com>
CC: Andrew Hunter <ahh@google.com>
CC: Peter Zijlstra <peterz@infradead.org>
CC: Andy Lutomirski <luto@amacapital.net>
CC: Andi Kleen <andi@firstfloor.org>
CC: Dave Watson <davejwatson@fb.com>
CC: Chris Lameter <cl@linux.com>
CC: Ingo Molnar <mingo@redhat.com>
CC: Ben Maurer <bmaurer@fb.com>
CC: Steven Rostedt <rostedt@goodmis.org>
CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
CC: Josh Triplett <josh@joshtriplett.org>
CC: Linus Torvalds <torvalds@linux-foundation.org>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Boqun Feng <boqun.feng@gmail.com>
CC: linux-api@vger.kernel.org
---
 arch/arm/Kconfig         | 1 +
 arch/arm/kernel/signal.c | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d1346a160760..1469f3f39475 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -87,6 +87,7 @@ config ARM
 	select HAVE_PERF_USER_STACK_DUMP
 	select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
 	select HAVE_REGS_AND_STACK_ACCESS_API
+	select HAVE_RSEQ
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_UID16
 	select HAVE_VIRT_CPU_ACCOUNTING_GEN
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index b67ae12503f3..cc3260f475b0 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -518,6 +518,12 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
 	int ret;
 
 	/*
+	 * Increment event counter and perform fixup for the pre-signal
+	 * frame.
+	 */
+	rseq_signal_deliver(regs);
+
+	/*
 	 * Set up the stack frame
 	 */
 	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
@@ -637,6 +643,7 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
 			} else {
 				clear_thread_flag(TIF_NOTIFY_RESUME);
 				tracehook_notify_resume(regs);
+				rseq_handle_notify_resume(regs);
 			}
 		}
 		local_irq_disable();
-- 
2.11.0

  parent reply	other threads:[~2017-11-06 21:02 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-06 20:56 [RFC PATCH for 4.15 00/14] Restartable sequences and CPU op vector v10 Mathieu Desnoyers
2017-11-06 20:56 ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH v10 for 4.15 01/14] Restartable sequences system call Mathieu Desnoyers
2017-11-07  1:24   ` Boqun Feng
2017-11-07  1:24     ` Boqun Feng
2017-11-07  2:20     ` Mathieu Desnoyers
2017-11-07  2:20       ` Mathieu Desnoyers
2017-11-06 20:56 ` Mathieu Desnoyers [this message]
2017-11-06 20:56 ` [RFC PATCH for 4.15 03/14] Restartable sequences: wire up ARM 32 " Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 04/14] Restartable sequences: x86 32/64 architecture support Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 05/14] Restartable sequences: wire up x86 32/64 system call Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 06/14] Restartable sequences: powerpc architecture support Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 07/14] Restartable sequences: Wire up powerpc system call Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH v2 for 4.15 08/14] Provide cpu_opv " Mathieu Desnoyers
2017-11-07  2:07   ` Boqun Feng
2017-11-07  2:07     ` Boqun Feng
2017-11-07  2:40     ` Mathieu Desnoyers
2017-11-07  2:40       ` Mathieu Desnoyers
2017-11-07  3:03       ` Boqun Feng
2017-11-07  3:03         ` Boqun Feng
2017-11-06 20:56 ` [RFC PATCH for 4.15 09/14] cpu_opv: Wire up x86 32/64 " Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 10/14] cpu_opv: Wire up powerpc " Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-07  0:37   ` Nicholas Piggin
2017-11-07  0:37     ` Nicholas Piggin
2017-11-07  0:47     ` Mathieu Desnoyers
2017-11-07  0:47       ` Mathieu Desnoyers
2017-11-07  1:21       ` Nicholas Piggin
2017-11-07  1:21         ` Nicholas Piggin
2017-11-06 20:56 ` [RFC PATCH for 4.15 11/14] cpu_opv: Wire up ARM32 " Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH v2 for 4.15 12/14] cpu_opv: Implement selftests Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH v2 for 4.15 13/14] Restartable sequences: Provide self-tests Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 14/14] Restartable sequences selftests: arm: workaround gcc asm size guess Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
  -- strict thread matches above, loose matches on Subject: below --
2017-11-06  9:22 [PATCH] mm, sparse: do not swamp log with huge vmemmap allocation failures Michal Hocko
2017-11-06  9:22 ` Michal Hocko
2017-11-06 17:35 ` Johannes Weiner
2017-11-06 17:35   ` Johannes Weiner
2017-11-06 17:57   ` Joe Perches
2017-11-06 18:14 ` Khalid Aziz
2017-11-06 18:14   ` Khalid Aziz
2017-11-06 18:18   ` Michal Hocko
2017-11-06 18:18     ` Michal Hocko
2017-11-06 20:17     ` Khalid Aziz
2017-11-06 20:17       ` Khalid Aziz
2017-11-07  9:06 ` Michal Hocko
2017-11-07  9:06   ` Michal Hocko

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