Subject: Re: [PATCH 02/13] powerpc: hugetlb: fix huge_ptep_set_access_flags return value

From: Benjamin Herrenschmidt <[email-masked]>
Date: Tue, 29 Nov 2011 14:58:22 +1100

On Mon, 2011-10-10 at 15:50 -0500, Becky Bruce wrote:

> diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
> index 8600493..70f9885 100644
> --- a/arch/powerpc/include/asm/hugetlb.h
> +++ b/arch/powerpc/include/asm/hugetlb.h
> @@ -124,7 +124,18 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
>  					     unsigned long addr, pte_t *ptep,
>  					     pte_t pte, int dirty)
>  {
> +#if defined(CONFIG_PPC_MMU_NOHASH) && \
> +	!(defined(CONFIG_PPC_FSL_BOOK3E) && defined(CONFIG_PPC32))

The above conditional makes my brain hurt. Can you change that to
instead

#ifdef HUGETLB_NEED_PRELOAD

 ... or something like that, which you then #define in the right
mmu-xxxx.h header ?

Cheers,
Ben.

> +	/*
> +	 * The "return 1" forces a call of update_mmu_cache, which will write a
> +	 * TLB entry.  Without this, platforms that don't do a write of the TLB
> +	 * entry in the TLB miss handler asm will fault ad infinitum.
> +	 */
> +	ptep_set_access_flags(vma, addr, ptep, pte, dirty);
> +	return 1;
> +#else
>  	return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
> +#endif
>  }
>  
>  static inline pte_t huge_ptep_get(pte_t *ptep)