Subject: Re: -mm merge plans for 2.6.21
From: David Woodhouse <dwmw2@infradead.org>
To: Russell King <rmk+lkml@arm.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Alexey Dobriyan <adobriyan@openvz.org>, linux-kernel@vger.kernel.org,
       drepper@redhat.com
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Date: Fri, 09 Feb 2007 22:42:48 +0000
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On Fri, 2007-02-09 at 22:12 +0000, David Woodhouse wrote:
> 
> We could _also_ do with a way to warn about unimplemented syscalls on
> any given architecture. I'm thinking about something along the lines
> of
> a kernel/syscalls.c containing nothing but...
> 
>         #include <asm/unistd.h>
> 
>         #ifndef __NR_sys_foo
>         #warning The sys_foo system call is not implemented on this
> architecture
>         #endif
> 
> Ideally, that wants to be auto-generated from the union of all
> <asm-*/unistd.h> files, but in practice I suspect we could do it just
> from <asm-i386/unistd.h>. Even I usually manage to add new syscalls on
> i386 after I've done PowerPC. 

Realistically speaking, I'm not going to have time to do anything useful
with this before I disappear for a week starting tomorrow. But in case
it helps, I'll throw this in to see if it inspires anyone...

 ( echo -e "#include <asm/unistd.h>\n#include
<asm-generic/optional-syscalls.h>" ; sed -n '/^#define/s/[^_]*__NR_
\([^[:space:]]*\).*/#if !defined (__NR_\1) \&\& !defined (__IGNORE_
\1)\n#warning System call \1 is not implemented\n#endif/p'
include/asm-i386/unistd.h ) > kernel/syscalls.c

Coupled with an include/optional-syscalls.h which defines __IGNORE_vm86,
__IGNORE_vm86old and then on 64-bit machines a bunch more
__IGNORE_stat64 et al., that should mostly do the trick...

-- 
dwmw2

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