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SubjectRe: [PATCH v2 2/3] powerpc: get hugetlbpage handling more generic
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Le 20/09/2016 à 04:28, Aneesh Kumar K.V a écrit :
> christophe leroy <christophe.leroy@c-s.fr> writes:
>
>> Le 19/09/2016 à 07:50, Aneesh Kumar K.V a écrit :
>>>
>>> Christophe Leroy <christophe.leroy@c-s.fr> writes:
>>>> +#else
>>>> +static void hugepd_free(struct mmu_gather *tlb, void *hugepte)
>>>> +{
>>>> + BUG();
>>>> +}
>>>> +
>>>> #endif
>>>
>>>
>>> I was expecting that BUG will get removed in the next patch. But I don't
>>> see it in the next patch. Considering
>>>
>>> @@ -475,11 +453,10 @@ static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshif
>>> for (i = 0; i < num_hugepd; i++, hpdp++)
>>> hpdp->pd = 0;
>>>
>>> -#ifdef CONFIG_PPC_FSL_BOOK3E
>>> - hugepd_free(tlb, hugepte);
>>> -#else
>>> - pgtable_free_tlb(tlb, hugepte, pdshift - shift);
>>> -#endif
>>> + if (shift >= pdshift)
>>> + hugepd_free(tlb, hugepte);
>>> + else
>>> + pgtable_free_tlb(tlb, hugepte, pdshift - shift);
>>> }
>>>
>>> What is that I am missing ?
>>>
>>
>> Previously, call to hugepd_free() was compiled only when #ifdef
>> CONFIG_PPC_FSL_BOOK3E
>> Now, it is compiled at all time, but it should never be called if not
>> CONFIG_PPC_FSL_BOOK3E because we always have shift < pdshift in that case.
>> Then the function needs to be defined anyway but should never be called.
>> Should I just define it static inline {} ?
>>
>
> For 8M with 4K mode, we have shift >= pdshift right ?
>

Yes, thats the reason why in the following patch we get. That way we get
a real hugepd_free() also for the 8xx.

@@ -366,7 +373,7 @@ int alloc_bootmem_huge_page(struct hstate *hstate)
}
#endif

-#ifdef CONFIG_PPC_FSL_BOOK3E
+#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_8xx)
#define HUGEPD_FREELIST_SIZE \
((PAGE_SIZE - sizeof(struct hugepd_freelist)) / sizeof(pte_t))



Christophe

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