Re: [PATCH] powerpc/mm/tlbflush: update the mmu_gather page size while iterating address range

[Nicholas Piggin <npiggin@gmail.com>]

On Thu,  9 Aug 2018 19:06:59 +0530
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:

> This patch makes sure we update the mmu_gather page size even if we are
> requesting for a fullmm flush. This avoids triggering VM_WARN_ON in code
> paths like __tlb_remove_page_size that explicitly check for removing range page
> size to be same as mmu gather page size.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>

Acked-by: Nicholas Piggin <npiggin@gmail.com>

Thanks, sorry bout that.

> ---
>  arch/powerpc/include/asm/tlb.h | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h
> index 97ecef697e1b..f0e571b2dc7c 100644
> --- a/arch/powerpc/include/asm/tlb.h
> +++ b/arch/powerpc/include/asm/tlb.h
> @@ -49,13 +49,11 @@ static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
>  static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
>  						     unsigned int page_size)
>  {
> -	if (tlb->fullmm)
> -		return;
> -
>  	if (!tlb->page_size)
>  		tlb->page_size = page_size;
>  	else if (tlb->page_size != page_size) {
> -		tlb_flush_mmu(tlb);
> +		if (!tlb->fullmm)
> +			tlb_flush_mmu(tlb);
>  		/*
>  		 * update the page size after flush for the new
>  		 * mmu_gather.