linux-kernel - Re: [PATCH 2/7] wire up sys_time_change

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Message-ID: <20100831124201.GI3003@shisha.kicks-ass.net>
Date:	Tue, 31 Aug 2010 15:42:01 +0300
From:	Alexander Shishkin <virtuoso@...nd.org>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	lkml@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>,
	linux-arm-kernel@...ts.infradead.org,
	Alexander Shishkin <virtuoso@...nd.org>
Subject: Re: [PATCH 2/7] wire up sys_time_change_notify() on ARM

On Tue, Aug 31, 2010 at 02:37:47 +0200, Mikael Pettersson wrote:
> Alexander Shishkin writes:
>  > sys_time_change_notify() is a new syscall with number and types of
>  > parameters such that no ARM-specific processing is needed.
>  > 
>  > Tested with 2.6.36-rc3 using Documentation/time-change-notify-example.c.
>  > 
>  > Signed-off-by: Alexander Shishkin <virtuoso@...nd.org>
>  > CC: Russell King <linux@....linux.org.uk>
>  > CC: Andrew Morton <akpm@...ux-foundation.org>
>  > CC: David Howells <dhowells@...hat.com>
>  > CC: Christoph Hellwig <hch@....de>
>  > CC: "H. Peter Anvin" <hpa@...or.com>
>  > CC: linux-arm-kernel@...ts.infradead.org
>  > CC: linux-kernel@...r.kernel.org
>  > ---
>  >  arch/arm/include/asm/unistd.h |    1 +
>  >  arch/arm/kernel/calls.S       |    1 +
>  >  2 files changed, 2 insertions(+), 0 deletions(-)
>  > 
>  > diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
>  > index d02cfb6..ce38a6f 100644
>  > --- a/arch/arm/include/asm/unistd.h
>  > +++ b/arch/arm/include/asm/unistd.h
>  > @@ -393,6 +393,7 @@
>  >  #define __NR_perf_event_open		(__NR_SYSCALL_BASE+364)
>  >  #define __NR_recvmmsg			(__NR_SYSCALL_BASE+365)
>  >  #define __NR_accept4			(__NR_SYSCALL_BASE+366)
>  > +#define __NR_time_change_notify		(__NR_SYSCALL_BASE+367)
>  >  
>  >  /*
>  >   * The following SWIs are ARM private.
>  > diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
>  > index afeb71f..f1e64ba 100644
>  > --- a/arch/arm/kernel/calls.S
>  > +++ b/arch/arm/kernel/calls.S
>  > @@ -376,6 +376,7 @@
>  >  		CALL(sys_perf_event_open)
>  >  /* 365 */	CALL(sys_recvmmsg)
>  >  		CALL(sys_accept4)
>  > +		CALL(sys_time_change_notify)
>  >  #ifndef syscalls_counted
>  >  .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
>  >  #define syscalls_counted
> 
> No, you need to use 370 as the syscall number on ARM as 367-369
> have been assigned to the fanotify and prlimit64 syscalls; see
> 
> http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=6343/1

I'm aware of that, but I don't know how to synchronize this with Russell's
devel branch. This patchset applies against 2.6.36-rc3. I guess, when it
comes to merging it, I'll update it against Russell's tree.

Regards,
--
Alex
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