[PATCH v4 3/5] getcpu_cache: wire up ARM system call

From	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Newsgroups	linux.kernel
Subject	[PATCH v4 3/5] getcpu_cache: wire up ARM system call
Date	2016-02-24 00:30 +0100
Message-ID	<r5uyZ-4cb-3@gated-at.bofh.it> (permalink)
References	<r5uyZ-4cb-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Wire up the getcpu cache system call on 32-bit ARM.

This provides an ABI improving the speed of a getcpu operation
on ARM by skipping the getcpu system call on the fast path.

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: linux-api@vger.kernel.org
---
 arch/arm/include/uapi/asm/unistd.h | 1 +
 arch/arm/kernel/calls.S            | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/uapi/asm/unistd.h b/arch/arm/include/uapi/asm/unistd.h
index 5dd2528..1ad1351 100644
--- a/arch/arm/include/uapi/asm/unistd.h
+++ b/arch/arm/include/uapi/asm/unistd.h
@@ -418,6 +418,7 @@
 #define __NR_membarrier			(__NR_SYSCALL_BASE+389)
 #define __NR_mlock2			(__NR_SYSCALL_BASE+390)
 #define __NR_copy_file_range		(__NR_SYSCALL_BASE+391)
+#define __NR_getcpu_cache		(__NR_SYSCALL_BASE+392)
 
 /*
  * The following SWIs are ARM private.
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index dfc7cd6..7e794e9 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -399,8 +399,9 @@
 		CALL(sys_execveat)
 		CALL(sys_userfaultfd)
 		CALL(sys_membarrier)
-		CALL(sys_mlock2)
+/* 390 */	CALL(sys_mlock2)
 		CALL(sys_copy_file_range)
+		CALL(sys_getcpu_cache)
 #ifndef syscalls_counted
 .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
 #define syscalls_counted
-- 
2.1.4

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[PATCH v4 3/5] getcpu_cache: wire up ARM system call Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-02-24 00:30 +0100
  Re: [PATCH v4 3/5] getcpu_cache: wire up ARM system call kbuild test robot <lkp@intel.com> - 2016-02-24 02:00 +0100
  [PATCH v4 (updated)] getcpu_cache: wire up ARM system call Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2016-02-24 02:10 +0100
    Re: [PATCH v4 (updated)] getcpu_cache: wire up ARM system call kbuild test robot <lkp@intel.com> - 2016-02-24 06:30 +0100
    Re: [PATCH v4 (updated)] getcpu_cache: wire up ARM system call kbuild test robot <lkp@intel.com> - 2016-02-24 08:00 +0100

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