Re: Problem Exporting Symbol

Re: Problem Exporting Symbol

[Jerry Van Baren]

OK, the source module was pointed out to me (arch/ppc/mm/fault.c).  The
problem is that Shiv is targeting the 8260, but va_to_pte() is only defined
for 8xx or CONFIG_GT64260_ETH.  Shiv doesn't say if he has
CONFIG_GT64260_ETH defined, I'm guessing not.

The code in question:

#if defined(CONFIG_8xx) || defined(CONFIG_GT64260_ETH)

/* The pgtable.h claims some functions generically exist, but I
  * can't find them......
  */
pte_t *va_to_pte(unsigned long address)


gvb


At 07:25 PM 1/21/2003 -0500, shivkumarb@hotmail.com wrote:

>Hi All,
>
>       I am trying to write SPI driver for 8260, based on the SPI driver for
>the MPC860 that I got from this list. I am trying to export the symbol
>'va_to_pte', for the driver module, in the kernel.
>
>       I included this in arch/ppc/kernel/ppc_ksyms.c, by using the
>EXPORT_SYMTAB(va_to_pte) function. But when I tried to rebuild the kernel
>(make zImage), it keeps coming back with the following error:
>
>arch/ppc/kernel/kernel.o(__ksymtab+0x0370): undefined reference to
>'va_to_pte'
>
>      I have exported other symbols, by following similar procedure. Is there
>something that I am missing.
>
>       I am running Linux kernel 2.4.2. Any inputs will be very helpful.
>
>   Thanks and Regards,
>     Shiv
>
>


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Re: Problem Exporting Symbol

[Jerry Van Baren]

I haven't checked the actual sources, but I bet 'va_to_pte' is _not_ a
symbol... it is probably either an "inline" function so the compiler
inserts the function's code everywhere it is "called" (saves the overhead
of the call and return with associated stack pushing and popping).  When
you try to export it, it isn't found.

Solutions:
1) Write your own non-inline "my_va_to_pte" in the kernel and export it.
2) Figure out how to avoid "va_to_pte" in your driver?
3) Don't make your SPI driver a loadable module?
3) Other?
4) Don't inline "va_to_pte" (BAD SOLUTION).

gvb


At 07:25 PM 1/21/2003 -0500, shivkumarb@hotmail.com wrote:

>Hi All,
>
>       I am trying to write SPI driver for 8260, based on the SPI driver for
>the MPC860 that I got from this list. I am trying to export the symbol
>'va_to_pte', for the driver module, in the kernel.
>
>       I included this in arch/ppc/kernel/ppc_ksyms.c, by using the
>EXPORT_SYMTAB(va_to_pte) function. But when I tried to rebuild the kernel
>(make zImage), it keeps coming back with the following error:
>
>arch/ppc/kernel/kernel.o(__ksymtab+0x0370): undefined reference to
>'va_to_pte'
>
>      I have exported other symbols, by following similar procedure. Is there
>something that I am missing.
>
>       I am running Linux kernel 2.4.2. Any inputs will be very helpful.
>
>   Thanks and Regards,
>     Shiv
>
>


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