Re: [-next Nov 17] s390 build break(arch/s390/kernel/compat_wrapper.S)

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On Tue, 2009-11-17 at 13:52 +0100, Heiko Carstens wrote:
> On Tue, Nov 17, 2009 at 05:36:19PM +0530, Sachin Sant wrote:
> > Today's next 20091117 build failed on s390 with
> > 
> > arch/s390/kernel/compat_wrapper.S: Assembler messages:
> > arch/s390/kernel/compat_wrapper.S:1871: Error: operand out of range (164 is not between 0 and 15)
> > arch/s390/kernel/compat_wrapper.S:1871: Error: junk at end of line: `(%r15)'
> > make[1]: *** [arch/s390/kernel/compat_wrapper.o] Error 1
> > 
> > The code in question was added by commit 9db3031ac785b068eb4636465eebb7b346c48dbb
> > 
> > fanotify: sys_fanotify_mark declartion
> 
> Hmm, the compat wrapper for sys_fanotify_mark is more broken (besides the
> fact that it doesn't compile).
> The same is true for sys_fanotify_init.
> 
> I thought it was general consensus that new syscalls should be wired up only
> on x86 and let arch maintainers wire them up on their architectures.
> Besides that a simple C source needs to be delivered so it can be easily
> tested on each architecture.
> 
> Especially we want to avoid subtle sign extension bugs like we have them here.
> Probably gone unnoticed if there wouldn't be a compile bug.

I'll un-wire tonight or fix it if you tell me how.  I guess my code was
supposed to use l instead of or as in sys_fallocate_wrapper() instead of
copying sys32_lookup_dcookie_wrapper().

Simple C source is available, but without s390 syscall definitions at
people.redhat.com/~eparis/fanotify

touch /tmp/tmp
./fanotify /tmp/tmp &
^Z
echo hello > /tmp/tmp
fg
^C

-Eric


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