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SubjectRe: [PATCH 1/3] powerpc/nohash: remove hash related code from nohash headers.
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Le 04/05/2018 à 13:17, Michael Ellerman a écrit :
> kbuild test robot <lkp@intel.com> writes:
>
>> Hi Christophe,
>>
>> Thank you for the patch! Yet something to improve:
>>
>> [auto build test ERROR on powerpc/next]
>> [also build test ERROR on v4.17-rc2 next-20180426]
>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>
>> url: https://github.com/0day-ci/linux/commits/Christophe-Leroy/powerpc-nohash-remove-hash-related-code-from-nohash-headers/20180425-182026
>> base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
>> config: powerpc-ppc64e_defconfig (attached as .config)
>> compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
>> reproduce:
>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>> chmod +x ~/bin/make.cross
>> # save the attached .config to linux build tree
>> make.cross ARCH=powerpc
>>
>> All errors (new ones prefixed by >>):
>>
>> In file included from arch/powerpc/include/asm/nohash/pgtable.h:6:0,
>> from arch/powerpc/include/asm/pgtable.h:19,
>> from include/linux/memremap.h:8,
>> from include/linux/mm.h:27,
>> from include/linux/mman.h:5,
>> from arch/powerpc/kernel/asm-offsets.c:22:
>> arch/powerpc/include/asm/nohash/64/pgtable.h: In function '__ptep_test_and_clear_young':
>>>> arch/powerpc/include/asm/nohash/64/pgtable.h:214:6: error: implicit declaration of function 'pte_young'; did you mean 'pte_pud'? [-Werror=implicit-function-declaration]
>> if (pte_young(*ptep))
>> ^~~~~~~~~
>> pte_pud
>
> Urk.
>
> There's a circular dependency here.
>
> I fixed it with the patch below, which seems to be the least worst
> solution. Possibly we can clean things up further in future.

Oops, I just sent you a new version of the patch not using pte_young()
anymore. I'll let you decide what to do.

Christophe

>
> cheers
>
> diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
> index 140f8e74b478..987a658b18e1 100644
> --- a/arch/powerpc/include/asm/nohash/32/pgtable.h
> +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
> @@ -267,6 +267,11 @@ static inline void __ptep_set_access_flags(struct mm_struct *mm,
> pte_update(ptep, clr, set);
> }
>
> +static inline int pte_young(pte_t pte)
> +{
> + return pte_val(pte) & _PAGE_ACCESSED;
> +}
> +
> #define __HAVE_ARCH_PTE_SAME
> #define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0)
>
> diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
> index e8de7cb4d3fb..6ac8381f4c7a 100644
> --- a/arch/powerpc/include/asm/nohash/64/pgtable.h
> +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
> @@ -204,6 +204,11 @@ static inline unsigned long pte_update(struct mm_struct *mm,
> return old;
> }
>
> +static inline int pte_young(pte_t pte)
> +{
> + return pte_val(pte) & _PAGE_ACCESSED;
> +}
> +
> static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
> unsigned long addr, pte_t *ptep)
> {
> diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
> index 077472640b35..2160be2e4339 100644
> --- a/arch/powerpc/include/asm/nohash/pgtable.h
> +++ b/arch/powerpc/include/asm/nohash/pgtable.h
> @@ -17,7 +17,6 @@ static inline int pte_write(pte_t pte)
> }
> static inline int pte_read(pte_t pte) { return 1; }
> static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
> -static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
> static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
> static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; }
> static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); }
>

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