linux-kernel - Re: [PATCH] Corrections in Documentation/block/ioprio.txt

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Message-ID: <20070823084519.GJ23758@kernel.dk>
Date:	Thu, 23 Aug 2007 10:45:19 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Balbir Singh <balbir@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Corrections in Documentation/block/ioprio.txt

On Thu, Aug 23 2007, Dhaval Giani wrote:
> On Thu, Aug 23, 2007 at 10:29:30AM +0200, Jens Axboe wrote:
> > On Thu, Aug 23 2007, Dhaval Giani wrote:
> > > Hi Jens,
> > > 
> > > The newer glibc does not allow system calls to be made via _syscallN()
> > > wrapper. They have to be made through syscall(). The ionice code used
> > > the older interface. Correcting it to use syscall.
> > > 
> > > Signed-of-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> > > 
> > > 
> > > Index: linux-2.6.23-rc3-mm1/Documentation/block/ioprio.txt
> > > ===================================================================
> > > --- linux-2.6.23-rc3-mm1.orig/Documentation/block/ioprio.txt	2007-07-09 05:02:17.000000000 +0530
> > > +++ linux-2.6.23-rc3-mm1/Documentation/block/ioprio.txt	2007-08-23 13:23:28.000000000 +0530
> > > @@ -86,8 +86,9 @@ extern int sys_ioprio_get(int, int);
> > >  #error "Unsupported arch"
> > >  #endif
> > >  
> > > -_syscall3(int, ioprio_set, int, which, int, who, int, ioprio);
> > > -_syscall2(int, ioprio_get, int, which, int, who);
> > > +#define ioprio_set(which, who, ioprio)  syscall(__NR_ioprio_set, which,\
> > > +							who, ioprio)
> > > +#define ioprio_get(which, who)	syscall(__NR_ioprio_get, which, who)
> > 
> > Agree, it fails as-of recent distros. But I prefer a function instead,
> > can you resend with something ala:
> > 
> > static inline int ioprio_set(int which, int who, int ioprio)
> > {
> >         return syscall(__NR_ioprio_set, which, who, ioprio);
> > }
> > 
> > and ditto for ioprio_get()?
> > 
> > -- 
> > Jens Axboe
> 
> Done..
> 
> ----------------------
> 
> The newer glibc does not allow system calls to be made via _syscallN()
> wrapper. They have to be made through syscall(). The ionice code used
> the older interface. Correcting it to use syscall.
>  
> Signed-off-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> 
> 
> Index: linux-2.6.23-rc3-mm1/Documentation/block/ioprio.txt
> ===================================================================
> --- linux-2.6.23-rc3-mm1.orig/Documentation/block/ioprio.txt	2007-07-09 05:02:17.000000000 +0530
> +++ linux-2.6.23-rc3-mm1/Documentation/block/ioprio.txt	2007-08-23 13:46:08.000000000 +0530
> @@ -86,8 +86,15 @@ extern int sys_ioprio_get(int, int);
>  #error "Unsupported arch"
>  #endif
>  
> -_syscall3(int, ioprio_set, int, which, int, who, int, ioprio);
> -_syscall2(int, ioprio_get, int, which, int, who);
> +static inline int ioprio_set(int which, int who, int ioprio)
> +{
> +	return syscall(__NR_ioprio_set, which, who, ioprio);
> +}
> +
> +static inline int ioprio_get(int which, int who)
> +{
> +	return syscall(__NR_ioprio_get, which, who);
> +}
>  
>  enum {
>  	IOPRIO_CLASS_NONE,

Thanks, applied!

-- 
Jens Axboe

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