Re: [PATCH v1 4/6] tlb: mmu_gather: add tlb_set_*_range APIs

[Peter Zijlstra]

On Fri, Apr 03, 2020 at 05:00:46PM +0800, Zhenyu Ye wrote:
> From: "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>
> 
> tlb_set_{pte|pmd|pud|p4d}_range() adjust the tlb->start and
> tlb->end, then set corresponding cleared_*.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> Signed-off-by: Zhenyu Ye <yezhenyu2@xxxxxxxxxx>
> ---
>  include/asm-generic/tlb.h | 55 ++++++++++++++++++++++++++++-----------
>  1 file changed, 40 insertions(+), 15 deletions(-)
> 
> diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
> index f391f6b500b4..ee91310a65c6 100644
> --- a/include/asm-generic/tlb.h
> +++ b/include/asm-generic/tlb.h
> @@ -511,6 +511,38 @@ static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vm
>  }
>  #endif
>  
> +/*
> + * tlb_set_{pte|pmd|pud|p4d}_range() adjust the tlb->start and tlb->end,
> + * and set corresponding cleared_*.
> + */
> +static inline void tlb_set_pte_range(struct mmu_gather *tlb,
> +				     unsigned long address, unsigned long size)
> +{
> +	__tlb_adjust_range(tlb, address, size);
> +	tlb->cleared_ptes = 1;
> +}
> +
> +static inline void tlb_set_pmd_range(struct mmu_gather *tlb,
> +				     unsigned long address, unsigned long size)
> +{
> +	__tlb_adjust_range(tlb, address, size);
> +	tlb->cleared_pmds = 1;
> +}
> +
> +static inline void tlb_set_pud_range(struct mmu_gather *tlb,
> +				     unsigned long address, unsigned long size)
> +{
> +	__tlb_adjust_range(tlb, address, size);
> +	tlb->cleared_puds = 1;
> +}
> +
> +static inline void tlb_set_p4d_range(struct mmu_gather *tlb,
> +				     unsigned long address, unsigned long size)
> +{
> +	__tlb_adjust_range(tlb, address, size);
> +	tlb->cleared_p4ds = 1;
> +}

Uhm.. when I wrote that patch they were called tlb_flush_p*_range():

  https://lkml.kernel.org/r/20200401122004.GE20713@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Your current naming makes no sense what so ever, we do not "set" the
range.