linux-kernel - Re: [Qemu-devel] [PATCH 19/23] userfaultfd: activate syscall

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Date:	Tue, 11 Aug 2015 15:37:29 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	qemu-devel@...gnu.org, kvm@...r.kernel.org,
	linux-api@...r.kernel.org, zhang.zhanghailiang@...wei.com,
	Pavel Emelyanov <xemul@...allels.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	"Dr. David Alan Gilbert" <dgilbert@...hat.com>,
	Sanidhya Kashyap <sanidhya.gatech@...il.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Huangpeng (Peter)" <peter.huangpeng@...wei.com>,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Feiner <pfeiner@...gle.com>
Subject: Re: [Qemu-devel] [PATCH 19/23] userfaultfd: activate syscall

On Thu, May 14, 2015 at 07:31:16PM +0200, Andrea Arcangeli wrote:
> This activates the userfaultfd syscall.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> ---
>  arch/powerpc/include/asm/systbl.h      | 1 +
>  arch/powerpc/include/uapi/asm/unistd.h | 1 +
>  arch/x86/syscalls/syscall_32.tbl       | 1 +
>  arch/x86/syscalls/syscall_64.tbl       | 1 +
>  include/linux/syscalls.h               | 1 +
>  kernel/sys_ni.c                        | 1 +
>  6 files changed, 6 insertions(+)
> 
> diff --git a/arch/powerpc/include/asm/systbl.h b/arch/powerpc/include/asm/systbl.h
> index f1863a1..4741b15 100644
> --- a/arch/powerpc/include/asm/systbl.h
> +++ b/arch/powerpc/include/asm/systbl.h
> @@ -368,3 +368,4 @@ SYSCALL_SPU(memfd_create)
>  SYSCALL_SPU(bpf)
>  COMPAT_SYS(execveat)
>  PPC64ONLY(switch_endian)
> +SYSCALL_SPU(userfaultfd)
> diff --git a/arch/powerpc/include/uapi/asm/unistd.h b/arch/powerpc/include/uapi/asm/unistd.h
> index e4aa173..6ad58d4 100644
> --- a/arch/powerpc/include/uapi/asm/unistd.h
> +++ b/arch/powerpc/include/uapi/asm/unistd.h
> @@ -386,5 +386,6 @@
>  #define __NR_bpf		361
>  #define __NR_execveat		362
>  #define __NR_switch_endian	363
> +#define __NR_userfaultfd	364

May be it is a bit late to bring this up, but I needed the following fix
to userfault21 branch of your git tree to compile on powerpc.
----

powerpc: Bump up __NR_syscalls to account for __NR_userfaultfd

From: Bharata B Rao <bharata@...ux.vnet.ibm.com>

With userfaultfd syscall, the number of syscalls will be 365 on PowerPC.
Reflect the same in __NR_syscalls.

Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
---
 arch/powerpc/include/asm/unistd.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index f4f8b66..4a055b6 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -12,7 +12,7 @@
 #include <uapi/asm/unistd.h>
 
 
-#define __NR_syscalls		364
+#define __NR_syscalls		365
 
 #define __NR__exit __NR_exit
 #define NR_syscalls	__NR_syscalls

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