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Message-Id: <1450807333-22104-3-git-send-email-mathieu.desnoyers@efficios.com>
Date: Tue, 22 Dec 2015 13:02:13 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Paul Turner <pjt@...gle.com>, Andrew Hunter <ahh@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Michael Kerrisk <mtk.manpages@...il.com>,
Russell King <linux@....linux.org.uk>
Cc: linux-kernel@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...capital.net>,
Andi Kleen <andi@...stfloor.org>,
Dave Watson <davejwatson@...com>, Chris Lameter <cl@...ux.com>,
Ingo Molnar <mingo@...hat.com>, Ben Maurer <bmaurer@...com>,
Steven Rostedt <rostedt@...dmis.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Josh Triplett <josh@...htriplett.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-api@...r.kernel.org
Subject: [RFC PATCH v2 3/3] thread_local_abi: wire up ARM system call
Wire up the thread local ABI on ARM32. Call the
thread_local_abi_handle_notify_resume() function on return to
userspace if TIF_NOTIFY_RESUME thread flag is set.
This provides an ABI improving the speed of a getcpu operation
on ARM by skipping the getcpu system call on the fast path.
[ Untested. ]
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
CC: Russell King <linux@....linux.org.uk>
CC: Catalin Marinas <catalin.marinas@....com>
CC: Will Deacon <will.deacon@....com>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Paul Turner <pjt@...gle.com>
CC: Andrew Hunter <ahh@...gle.com>
CC: Peter Zijlstra <peterz@...radead.org>
CC: Andy Lutomirski <luto@...capital.net>
CC: Andi Kleen <andi@...stfloor.org>
CC: Dave Watson <davejwatson@...com>
CC: Chris Lameter <cl@...ux.com>
CC: Ingo Molnar <mingo@...hat.com>
CC: Ben Maurer <bmaurer@...com>
CC: Steven Rostedt <rostedt@...dmis.org>
CC: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC: Josh Triplett <josh@...htriplett.org>
CC: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: linux-api@...r.kernel.org
---
arch/arm/include/uapi/asm/unistd.h | 1 +
arch/arm/kernel/calls.S | 1 +
arch/arm/kernel/signal.c | 2 ++
3 files changed, 4 insertions(+)
diff --git a/arch/arm/include/uapi/asm/unistd.h b/arch/arm/include/uapi/asm/unistd.h
index 7a2a32a..859433a 100644
--- a/arch/arm/include/uapi/asm/unistd.h
+++ b/arch/arm/include/uapi/asm/unistd.h
@@ -416,6 +416,7 @@
#define __NR_execveat (__NR_SYSCALL_BASE+387)
#define __NR_userfaultfd (__NR_SYSCALL_BASE+388)
#define __NR_membarrier (__NR_SYSCALL_BASE+389)
+#define __NR_thread_local_abi (__NR_SYSCALL_BASE+390)
/*
* The following SWIs are ARM private.
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index fde6c88..82b59cc 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -399,6 +399,7 @@
CALL(sys_execveat)
CALL(sys_userfaultfd)
CALL(sys_membarrier)
+/* 390 */ CALL(sys_thread_local_abi)
#ifndef syscalls_counted
.equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
#define syscalls_counted
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 7b8f214..c64cd2f 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -594,6 +594,8 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
} else {
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(regs);
+ if (thread_local_abi_active(current))
+ thread_local_abi_handle_notify_resume(current);
}
}
local_irq_disable();
--
2.1.4
--
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