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 4/9] Restartable sequences: wire up ARM 32 system call
Date: Fri, 19 Aug 2016 16:07:49 -0400 [thread overview]
Message-ID: <1471637274-13583-5-git-send-email-mathieu.desnoyers@efficios.com> (raw)
In-Reply-To: <1471637274-13583-1-git-send-email-mathieu.desnoyers@efficios.com>
Wire up the rseq system call on 32-bit ARM.
This provides an ABI improving the speed of a user-space getcpu
operation on ARM by skipping the getcpu system call on the fast path, as
well as improving the speed of user-space operations on per-cpu data
compared to using load-linked/store-conditional.
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/include/uapi/asm/unistd.h | 1 +
arch/arm/kernel/calls.S | 1 +
2 files changed, 2 insertions(+)
diff --git a/arch/arm/include/uapi/asm/unistd.h b/arch/arm/include/uapi/asm/unistd.h
index 2cb9dc7..8f61c79 100644
--- a/arch/arm/include/uapi/asm/unistd.h
+++ b/arch/arm/include/uapi/asm/unistd.h
@@ -420,6 +420,7 @@
#define __NR_copy_file_range (__NR_SYSCALL_BASE+391)
#define __NR_preadv2 (__NR_SYSCALL_BASE+392)
#define __NR_pwritev2 (__NR_SYSCALL_BASE+393)
+#define __NR_rseq (__NR_SYSCALL_BASE+394)
/*
* The following SWIs are ARM private.
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 703fa0f..0865c04 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -403,6 +403,7 @@
CALL(sys_copy_file_range)
CALL(sys_preadv2)
CALL(sys_pwritev2)
+ CALL(sys_rseq)
#ifndef syscalls_counted
.equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
#define syscalls_counted
--
2.1.4
next prev parent reply other threads:[~2016-08-19 20:09 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 ` Mathieu Desnoyers [this message]
2016-08-19 20:07 ` [RFC PATCH v8 5/9] Restartable sequences: x86 32/64 " Mathieu Desnoyers
2016-08-19 20:07 ` [RFC PATCH v8 6/9] Restartable sequences: wire up x86 32/64 system call 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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