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Re: [RFC PATCH v2 6/9] arm: allocate sys_membarrier system call number

From Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Newsgroups linux.kernel
Subject Re: [RFC PATCH v2 6/9] arm: allocate sys_membarrier system call number
Date 2015-09-16 20:30 +0200
Message-ID <q9pCW-3ZU-43@gated-at.bofh.it> (permalink)
References <q67jb-2cI-3@gated-at.bofh.it> <q67jc-2cI-25@gated-at.bofh.it>
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----- On Sep 7, 2015, at 12:15 PM, Mathieu Desnoyers mathieu.desnoyers@efficios.com wrote:

> [ Untested on this architecture. To try it out: fetch linux-next/akpm,
>  apply this patch, build/run a membarrier-enabled kernel, and do make
>  kselftest. ]

Hi,

We tested the system call on our ARM board (Wandboard, SoC
Freescale i.MX6 Quad) by applying this patch on top of
Linux 4.3-rc1. Both the membarrier kselftest and
Userspace RCU regression tests (the latter manually wired up
on sys_membarrier) work fine.

Tested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

sys_membarrier has been pulled into Linux 4.3-rc1. Please
feel free to wire it up on ARM.

Thanks!

Mathieu


> 
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> CC: Andrew Morton <akpm@linux-foundation.org>
> CC: linux-api@vger.kernel.org
> CC: Russell King <linux@arm.linux.org.uk>
> ---
> arch/arm/include/asm/unistd.h      | 2 +-
> arch/arm/include/uapi/asm/unistd.h | 1 +
> arch/arm/kernel/calls.S            | 1 +
> 3 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
> index 32640c4..d93876c 100644
> --- a/arch/arm/include/asm/unistd.h
> +++ b/arch/arm/include/asm/unistd.h
> @@ -19,7 +19,7 @@
>  * This may need to be greater than __NR_last_syscall+1 in order to
>  * account for the padding in the syscall table
>  */
> -#define __NR_syscalls  (388)
> +#define __NR_syscalls  (389)
> 
> /*
>  * *NOTE*: This is a ghost syscall private to the kernel.  Only the
> diff --git a/arch/arm/include/uapi/asm/unistd.h
> b/arch/arm/include/uapi/asm/unistd.h
> index 0c3f5a0..436bb32 100644
> --- a/arch/arm/include/uapi/asm/unistd.h
> +++ b/arch/arm/include/uapi/asm/unistd.h
> @@ -414,6 +414,7 @@
> #define __NR_memfd_create		(__NR_SYSCALL_BASE+385)
> #define __NR_bpf			(__NR_SYSCALL_BASE+386)
> #define __NR_execveat			(__NR_SYSCALL_BASE+387)
> +#define __NR_membarrier			(__NR_SYSCALL_BASE+388)
> 
> /*
>  * The following SWIs are ARM private.
> diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
> index 05745eb..310699c 100644
> --- a/arch/arm/kernel/calls.S
> +++ b/arch/arm/kernel/calls.S
> @@ -397,6 +397,7 @@
> /* 385 */	CALL(sys_memfd_create)
> 		CALL(sys_bpf)
> 		CALL(sys_execveat)
> +		CALL(sys_membarrier)
> #ifndef syscalls_counted
> .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
> #define syscalls_counted
> --
> 1.9.1

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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[PATCH v2 0/9] Allocate sys_membarrier on main architectures Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
  [PATCH v2 4/9] parisc: allocate sys_membarrier system call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
    Re: [PATCH v2 4/9] parisc: allocate sys_membarrier system call  number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 17:10 +0200
      Re: [PATCH v2 4/9] parisc: allocate sys_membarrier system call number Helge Deller <deller@gmx.de> - 2015-09-16 22:00 +0200
  [PATCH v2 1/9] [picked] powerpc: allocate sys_membarrier system call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
  [RFC PATCH v2 5/9] alpha: allocate sys_membarrier system call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
    Re: [RFC PATCH v2 5/9] alpha: allocate sys_membarrier system call  number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 17:20 +0200
  [PATCH v2 3/9] sparc/sparc64: allocate sys_membarrier system call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
    Re: [PATCH v2 3/9] sparc/sparc64: allocate sys_membarrier system  call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 17:10 +0200
      Re: [PATCH v2 3/9] sparc/sparc64: allocate sys_membarrier system  call number David Miller <davem@davemloft.net> - 2015-09-16 20:00 +0200
        Re: [PATCH v2 3/9] sparc/sparc64: allocate sys_membarrier system  call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 20:10 +0200
  [RFC PATCH v2 7/9] arm64: allocate sys_membarrier system call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
    Re: [RFC PATCH v2 7/9] arm64: allocate sys_membarrier system call  number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 17:20 +0200
      Re: [RFC PATCH v2 7/9] arm64: allocate sys_membarrier system call  number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 18:40 +0200
        Re: [RFC PATCH v2 7/9] arm64: allocate sys_membarrier system call  number Will Deacon <will.deacon@arm.com> - 2015-09-16 18:40 +0200
      Re: [RFC PATCH v2 7/9] arm64: allocate sys_membarrier system call  number Will Deacon <will.deacon@arm.com> - 2015-09-16 18:40 +0200
  [RFC PATCH v2 9/9] s390/s390x: allocate sys_membarrier system call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
    Re: [RFC PATCH v2 9/9] s390/s390x: allocate sys_membarrier system  call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 17:30 +0200
      Re: [RFC PATCH v2 9/9] s390/s390x: allocate sys_membarrier system  call number Martin Schwidefsky <schwidefsky@de.ibm.com> - 2015-09-17 13:40 +0200
  [RFC PATCH v2 6/9] arm: allocate sys_membarrier system call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
    Re: [RFC PATCH v2 6/9] arm: allocate sys_membarrier system call  number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 20:30 +0200
      Re: [RFC PATCH v2 6/9] arm: allocate sys_membarrier system call  number Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-17 15:20 +0200
        Re: [RFC PATCH v2 6/9] arm: allocate sys_membarrier system call  number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-17 15:40 +0200
          Re: [RFC PATCH v2 6/9] arm: allocate sys_membarrier system call  number Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-17 15:50 +0200
  [RFC PATCH v2 8/9] ia64: allocate sys_membarrier system call number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-07 18:20 +0200
    Re: [RFC PATCH v2 8/9] ia64: allocate sys_membarrier system call  number Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-09-16 17:20 +0200

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