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Christoph Hellwig 535f8d65d8 [SPARC]: Fix RTC compat ioctl kernel log spam. 
On Fri, Nov 11, 2005 at 12:58:40PM -0800, David S. Miller wrote:
> 
> This change:
> 
> diff-tree 8ca2bdc7a9 (from feee207e44d3643d19e648aAuthor: Christoph Hellwig <hch@lst.de>
> Date:   Wed Nov 9 12:07:18 2005 -0800
> 
>     [SPARC] sbus rtc: implement ->compat_ioctl
>     
>     Signed-off-by: Christoph Hellwig <hch@lst.de>
>     Signed-off-by: David S. Miller <davem@davemloft.net>
> 
> results in the console now getting spewed on sparc64 systems
> with messages like:
> 
> [   11.968298] ioctl32(hwclock:464): Unknown cmd fd(3) cmd(401c7014){00} arg(efc
> What's happening is hwclock tries first the SBUS rtc device ioctls
> then the normal rtc driver ones.
> 
> So things actually worked better when we had the SBUS rtc compat ioctl
> directly handled via the generic compat ioctl code.
> 
> There are _so_ many rtc drivers in the kernel implementing the
> generic rtc ioctls that I don't think putting a ->compat_ioctl
> into all of them to fix this problem is feasible.  Unless we
> write a single rtc_compat_ioctl(), export it to modules, and hook
> it into all of those somehow.
> 
> But even that doesn't appear to have any pretty implementation.
> 
> Any better ideas?

We had similar problems with other ioctls where userspace did things
like that.  What we did there was to put the compat handler to generic
code.  The patch below does that, adding a big comment about what's
going on and removing the COMPAT_IOCTL entires for these on powerpc
that not only weren't ever useful but are duplicated now aswell.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-11-12 12:10:54 -08:00
..
configs [PATCH] ppc64: Update g5_defconfig for ARCH=powerpc 2005-11-08 11:17:50 +11:00
kernel [SPARC]: Fix RTC compat ioctl kernel log spam. 2005-11-12 12:10:54 -08:00
lib powerpc: Fix find_next_bit on 32-bit 2005-11-10 12:01:41 +11:00
mm [PATCH] powerpc: Merge vdso's and add vdso support to 32 bits kernel 2005-11-11 22:25:39 +11:00
oprofile [PATCH] powerpc: Merge vdso's and add vdso support to 32 bits kernel 2005-11-11 22:25:39 +11:00
platforms powerpc: Fix some compile problems with the VDSO stuff 2005-11-11 23:04:40 +11:00
sysdev [PATCH] powerpc: 64k pages vs. U3 iommu 2005-11-10 15:03:37 +11:00
xmon powerpc: Fix reading and writing SPRs from xmon on 32-bit 2005-11-11 22:36:34 +11:00
Kconfig [PATCH] ppc64: Convert NUMA to sparsemem (3) 2005-11-11 22:21:11 +11:00
Kconfig.debug [PATCH] Move Kprobes and Oprofile to "Instrumentation Support" menu 2005-11-07 07:53:35 -08:00
Makefile powerpc: Set entry point and text address in linker script 2005-11-03 16:03:06 +11:00