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

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Message-ID: <20070823082836.GB27439@linux.vnet.ibm.com>
Date:	Thu, 23 Aug 2007 13:58:36 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Jens Axboe <jens.axboe@...cle.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 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,
-- 
regards,
Dhaval

I would like to change the world but they don't give me the source code!
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