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SubjectRe: [BUILD-FAILURE] 2.6.26-rc8-mm1 - x86 - __ptep_modify_prot_start() missing
Andrew Morton wrote:
> On Thu, 3 Jul 2008 17:59:43 +0530 Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> wrote:
>
>
>> Hi Andrew,
>>
>> 2.6.26-rc8-mm1 kernel build fails on the x86
>>
>> CC arch/x86/kernel/paravirt.o
>> arch/x86/kernel/paravirt.c:383: error: _____ptep_modify_prot_start___ undeclared here (not in a function)
>>

Where did all those _____underlines___ come from?

>> make[1]: *** [arch/x86/kernel/paravirt.o] Error 1
>> make: *** [arch/x86/kernel] Error 2
>>
>> linux-next patches has the changes to the adds the function
>> __ptep_modify_prot_start as inline, the patch s390-build-fixes.patch
>> is coverting it into macro. Reverting the s390-build-fixes.patch
>> fixes the build failure.
>>
>
> grump. Who did all this stuff?
>
> I dunno. I'll drop s390-build-fixes.patch, add some ccs and stomp off.
>
>
> From: Andrew Morton <akpm@linux-foundation.org>
>
> In file included from include/asm/pgtable.h:1087,
> from include/linux/mm.h:39,
> from arch/s390/mm/hugetlbpage.c:8:
> include/asm-generic/pgtable.h: In function '__ptep_modify_prot_start':
> include/asm-generic/pgtable.h:209: error: dereferencing pointer to incomplete type
>

We can't turn them into macros because we're expecting to be able to
take the address of __ptep_modify_prot_start/commit. What type is not
defined on s390 at that point? Would simply adding an extra include to
arch/s390/mm/hugetlbpage.c fix the problem?

In the worst case we could push __ptep_modify_proc_start/commit out of
line somewhere appropriate, but that's a bit sad given how simple they are.

J

> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
>
> include/asm-generic/pgtable.h | 26 +++++++++-----------------
> 1 file changed, 9 insertions(+), 17 deletions(-)
>
> diff -puN include/asm-generic/pgtable.h~s390-build-fixes include/asm-generic/pgtable.h
> --- a/include/asm-generic/pgtable.h~s390-build-fixes
> +++ a/include/asm-generic/pgtable.h
> @@ -197,17 +197,13 @@ static inline int pmd_none_or_clear_bad(
> }
> #endif /* CONFIG_MMU */
>
> -static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm,
> - unsigned long addr,
> - pte_t *ptep)
> -{
> - /*
> - * Get the current pte state, but zero it out to make it
> - * non-present, preventing the hardware from asynchronously
> - * updating it.
> - */
> - return ptep_get_and_clear(mm, addr, ptep);
> -}
> +/*
> + * Get the current pte state, but zero it out to make it
> + * non-present, preventing the hardware from asynchronously
> + * updating it.
> + */
> +#define __ptep_modify_prot_start(mm, addr, ptep) \
> + ptep_get_and_clear(mm, addr, ptep)
>
> static inline void __ptep_modify_prot_commit(struct mm_struct *mm,
> unsigned long addr,
> @@ -235,12 +231,8 @@ static inline void __ptep_modify_prot_co
> * queue the update to be done at some later time. The update must be
> * actually committed before the pte lock is released, however.
> */
> -static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
> - unsigned long addr,
> - pte_t *ptep)
> -{
> - return __ptep_modify_prot_start(mm, addr, ptep);
> -}
> +#define ptep_modify_prot_start(mm, addr, ptep) \
> + __ptep_modify_prot_start(mm, addr, ptep)
>
> /*
> * Commit an update to a pte, leaving any hardware-controlled bits in
> _
>
>
>



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