Re: [uml-devel] skas3 patch breaks ATI video drivers

[Marcus Better <marcus@better.se>]

Blaisorblade wrote:
> *strange* that a kernel module uses the "_syscall" macro to do a syscall with 
> "int 0x80" while already being in kernelspace...

It's interesting that the module contains the following code:

------------------------
//#define FGL_USE_SCT /* for developer use only */

//...<snip>...


#ifdef FGL_USE_SCT
// get direct function pointers from sys_call_table for calling
#else /* FGL_USE_SCT */
// call functions indirectly by using the syscall macros,
// entrypoints get defined by below constructs

#if !defined(__ia64__)
// the macros do use errno variable
static int errno;
#endif // __ia64__

// int mlock(const void *addr, size_t len);
_syscall2(int, mlock, const void *, addr, size_t, len )
// int munlock(const void *addr, size_t len);
_syscall2(int, munlock, const void *, addr, size_t, len )
#if !defined(__ia64__)
#if !defined(__x86_64__)
// TODO: ia64
// int modify_ldt(int func, void *ptr, unsigned long bytecount);
_syscall3( int, modify_ldt, int, func, void *, ptr, unsigned long, 
bytecount )
#endif
#endif
#endif /* FGL_USE_SCT */
--------------------------

I actually tried to #define FGL_USE_SCT, but it didn't compile either.


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