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>
Subject: [RFC PATCH for 4.18 03/16] arm: Add restartable sequences support
Date: Sat, 2 Jun 2018 08:43:55 -0400 [thread overview]
Message-ID: <20180602124408.8430-4-mathieu.desnoyers@efficios.com> (raw)
In-Reply-To: <20180602124408.8430-1-mathieu.desnoyers@efficios.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 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 a7f8e7f4b88f..4f5c386631d4 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -91,6 +91,7 @@ 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 bd8810d4acb3..5879ab3f53c1 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -541,6 +541,12 @@ 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)
@@ -660,6 +666,7 @@ 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
next prev parent reply other threads:[~2018-06-02 12:46 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-02 12:43 [RFC PATCH for 4.18 00/16] Restartable Sequences Mathieu Desnoyers
2018-06-02 12:43 ` [RFC PATCH for 4.18 01/16] uapi headers: Provide types_32_64.h (v2) Mathieu Desnoyers
2018-06-02 12:43 ` [RFC PATCH for 4.18 02/16] rseq: Introduce restartable sequences system call (v13) Mathieu Desnoyers
2018-06-02 12:43 ` Mathieu Desnoyers [this message]
2018-06-02 12:43 ` [RFC PATCH for 4.18 04/16] arm: Add syscall detection for restartable sequences Mathieu Desnoyers
2018-06-02 12:43 ` [RFC PATCH for 4.18 05/16] arm: Wire up restartable sequences system call Mathieu Desnoyers
2018-06-02 12:43 ` [RFC PATCH for 4.18 06/16] x86: Add support for restartable sequences (v2) Mathieu Desnoyers
2018-06-02 12:43 ` [RFC PATCH for 4.18 07/16] x86: Wire up restartable sequence system call Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 08/16] powerpc: Add support for restartable sequences Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 09/16] powerpc: Add syscall detection " Mathieu Desnoyers
2018-06-05 5:21 ` Michael Ellerman
2018-06-05 12:50 ` Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 10/16] powerpc: Wire up restartable sequences system call Mathieu Desnoyers
2018-06-05 5:18 ` Michael Ellerman
2018-06-05 12:51 ` Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 11/16] selftests: lib.mk: Introduce OVERRIDE_TARGETS Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 12/16] rseq: selftests: Provide rseq library (v5) Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 13/16] rseq: selftests: Provide basic test Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 14/16] rseq: selftests: Provide basic percpu ops test (v2) Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 15/16] rseq: selftests: Provide parametrized tests (v2) Mathieu Desnoyers
2018-06-02 12:44 ` [RFC PATCH for 4.18 16/16] rseq: selftests: Provide Makefile, scripts, gitignore (v2) Mathieu Desnoyers
2018-07-27 22:01 ` [RFC PATCH for 4.18 00/16] Restartable Sequences Pavel Machek
2018-07-28 13:49 ` Mathieu Desnoyers
2018-07-28 14:13 ` Pavel Machek
2018-07-30 18:42 ` Mathieu Desnoyers
2018-07-30 19:07 ` Pavel Machek
2018-07-30 19:34 ` Mathieu Desnoyers
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180602124408.8430-4-mathieu.desnoyers@efficios.com \
--to=mathieu.desnoyers@efficios.com \
--cc=ahh@google.com \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=bmaurer@fb.com \
--cc=boqun.feng@gmail.com \
--cc=catalin.marinas@arm.com \
--cc=cl@linux.com \
--cc=davejwatson@fb.com \
--cc=hpa@zytor.com \
--cc=joelaf@google.com \
--cc=josh@joshtriplett.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@arm.linux.org.uk \
--cc=luto@amacapital.net \
--cc=mingo@redhat.com \
--cc=mtk.manpages@gmail.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=pjt@google.com \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).