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 v8 5/9] Restartable sequences: x86 32/64 architecture support
Date: Fri, 19 Aug 2016 16:07:50 -0400 [thread overview]
Message-ID: <1471637274-13583-6-git-send-email-mathieu.desnoyers@efficios.com> (raw)
In-Reply-To: <1471637274-13583-1-git-send-email-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: "H. Peter Anvin" <hpa@zytor.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/x86/Kconfig | 1 +
arch/x86/entry/common.c | 1 +
arch/x86/kernel/signal.c | 6 ++++++
3 files changed, 8 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c580d8c..ae688f3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -143,6 +143,7 @@ config X86
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
select HAVE_REGS_AND_STACK_ACCESS_API
+ select HAVE_RSEQ
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_UID16 if X86_32 || IA32_EMULATION
select HAVE_UNSTABLE_SCHED_CLOCK
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 1433f6b..86e0c5f 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -165,6 +165,7 @@ static void exit_to_usermode_loop(struct pt_regs *regs, u32 cached_flags)
if (cached_flags & _TIF_NOTIFY_RESUME) {
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(regs);
+ rseq_handle_notify_resume(regs);
}
if (cached_flags & _TIF_USER_RETURN_NOTIFY)
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 04cb321..d7252b5 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -683,6 +683,12 @@ setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
sigset_t *set = sigmask_to_save();
compat_sigset_t *cset = (compat_sigset_t *) set;
+ /*
+ * Increment event counter and perform fixup for the pre-signal
+ * frame.
+ */
+ rseq_signal_deliver(regs);
+
/* Set up the stack frame */
if (is_ia32_frame()) {
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
--
2.1.4
next prev parent reply other threads:[~2016-08-19 20:11 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-19 20:07 [RFC PATCH v8 0/9] Restartable sequences system call Mathieu Desnoyers
2016-08-19 20:07 ` [RFC PATCH v8 1/9] " Mathieu Desnoyers
2016-08-19 20:23 ` Linus Torvalds
2016-08-19 20:44 ` Josh Triplett
2016-08-19 20:59 ` Linus Torvalds
2016-08-19 20:56 ` Andi Kleen
2016-08-19 21:19 ` Paul E. McKenney
2016-08-19 21:32 ` Linus Torvalds
2016-08-19 23:35 ` Paul E. McKenney
2016-08-19 21:24 ` Josh Triplett
2016-08-19 22:59 ` Dave Watson
2016-08-25 17:08 ` Mathieu Desnoyers
2016-08-25 17:56 ` Ben Maurer
2016-08-27 4:22 ` Josh Triplett
2016-08-29 15:16 ` Mathieu Desnoyers
2016-08-29 16:10 ` Josh Triplett
2016-08-30 2:01 ` Boqun Feng
2016-08-27 12:21 ` Pavel Machek
2016-08-19 20:07 ` [RFC PATCH v8 2/9] tracing: instrument restartable sequences Mathieu Desnoyers
2016-08-19 20:07 ` [RFC PATCH v8 3/9] Restartable sequences: ARM 32 architecture support Mathieu Desnoyers
2016-08-19 20:07 ` [RFC PATCH v8 4/9] Restartable sequences: wire up ARM 32 system call Mathieu Desnoyers
2016-08-19 20:07 ` Mathieu Desnoyers [this message]
2016-08-19 20:07 ` [RFC PATCH v8 6/9] Restartable sequences: wire up x86 32/64 " Mathieu Desnoyers
2016-08-19 20:07 ` [RFC PATCH v8 7/9] Restartable sequences: powerpc architecture support Mathieu Desnoyers
2016-08-19 20:07 ` [RFC PATCH v8 8/9] Restartable sequences: Wire up powerpc system call Mathieu Desnoyers
2016-08-19 20:07 ` [RFC PATCH v8 9/9] Restartable sequences: self-tests Mathieu Desnoyers
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