On 06/26/2013 04:05 PM, Richard Weinberger wrote:
>>>> >>> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
>>>> >>> index d5afe96..e80331d 100644
>>>> >>> --- a/include/asm-generic/io.h
>>>> >>> +++ b/include/asm-generic/io.h
>>>> >>> @@ -303,10 +303,10 @@ static inline void *phys_to_virt(unsigned long
>>>> >>> address)
>>>> >>> /*
>>>> >>> * Change "struct page" to physical address.
>>>> >>> *
>>>> >>> - * This implementation is for the no-MMU case only... if you have an
>>>> >>> MMU
>>>> >>> + * This implementation is for the no-MMU or UML case only... if you
>>>> >>> have an MMU
>>>> >>> * you'll need to provide your own definitions.
>>>> >>> */
>>>> >>> -#ifndef CONFIG_MMU
>>>> >>> +#if !CONFIG_MMU || CONFIG_UML
>>>> >>> static inline void __iomem *ioremap(phys_addr_t offset, unsigned long
>>>> >>> size)
>>>> >>> {
>>>> >>> return (void __iomem*) (unsigned long)offset;
>>>> >>> @@ -325,7 +325,7 @@ static inline void __iomem *ioremap(phys_addr_t
>>>> >>> offset, unsigned long size)
>>>> >>> static inline void iounmap(void __iomem *addr)
>>>> >>> {
>>>> >>> }
>>>> >>> -#endif /* CONFIG_MMU */
>>>> >>> +#endif /* !CONFIG_MMU || CONFIG_UML */
>>>> >>>
>>>> >>> #ifdef CONFIG_HAS_IOPORT
>>>> >>> #ifndef CONFIG_GENERIC_IOMAP
>>>> >>>
>>> >>
>>> >> UML has no io memory but a MMU, so I'd argue that you better fix
>>> >> drivers/ptp/ptp_pch.c dependencies.
>>> >> _If_ ptp_pch.c really works without real io memory, you can look what I
>>> >> did in my GENERIC_IO series[1]
>>> >> to make nandsim work on UML. Maybe this helps.
>>> >>
>> >
>> > But "no io memory" is not the excuse to not define the related dummy
>> > function.
> UML has no io memory, period.
> Same applies for s390, it also includes asm-generic/io.h in the !CONFIG_PCI
> case.
> UML and s390 are very special here.
>
Oh, yes, really the same.
>> > The drivers internal code has already check the related return value,
>> > so it is the architecture's duty to 'tell' the driver whether support
>> > io memory (e.g. define ioremap, but return NULL).
> It does so already by setting CONFIG_HAS_IOMEM=n
Excuse me, I use "grep -rn ioremap *" under "include/" and "arch/um/"
directory, but can not find the related definition for 'ioremap'.
Is there another declaration or definition way which I don't know ?
(maybe it is).
For our case, the ".config" file does not define 'CONFIG_HAS_IOMEM', can
I assume it means "CONFIG_HAS_IOMEM=n" ?
Thanks
--
Chen Gang
Asianux Corporation
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