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SubjectRe: linux-next: 1ea0704e (ptep_modify_prot transaction abstraction) breaks no-mmu
On Thu, Jul 03, 2008 at 08:53:52AM -0700, Jeremy Fitzhardinge wrote:
> Mike Frysinger wrote:
>> the functions added to asm-generic/pgtable.h are only used by
>> mm/mprotect.c (a MMU-only file), but they were not added inside of the
>> CONFIG_MMU ifdef block. since the functions rely on things inside of
>> CONFIG_MMU (the lines just above in pgtable.h), we get build failure
>> on all no-mmu setups:
>> CC init/main.o
>> In file included from include/asm/pgtable.h:94,
>> from include/linux/mm.h:39,
>> from include/asm/dma.h:39,
>> from include/linux/bootmem.h:8,
>> from init/main.c:27:
>> include/asm-generic/pgtable.h: In function '__ptep_modify_prot_start':
>> include/asm-generic/pgtable.h:210: error: implicit declaration of
>> function 'ptep_get_and_clear'
>> include/asm-generic/pgtable.h:210: error: incompatible types in return
>> make[1]: *** [init/main.o] Error 1
>> make: *** [init/main.o] Error 2
>> -mike
>>
>
> Uh, OK. What does mprotect do on a nommu system? Would it be
> sufficient to move the definitions of __ptep_modify_prot_start/commit
> out of a CONFIG_MMU block, or provide separate no-op versions?

FYI:
The compile error now moved into Linus' tree, and broke at least the
blackfin and m68knommu ports.

> J

cu
Adrian

--

"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed



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