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

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Date:	Tue, 31 Aug 2010 14:37:47 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Alexander Shishkin <virtuoso@...nd.org>
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
Subject: Re: [PATCH 2/7] wire up sys_time_change_notify() on ARM

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

/Mikael
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