linux-kernel - Re: [PATCH v2 14/15] mm: pgtable: remove tlb_remove

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Message-ID: <20241218164520.GK2354@noisy.programming.kicks-ass.net>
Date: Wed, 18 Dec 2024 17:45:20 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Qi Zheng <zhengqi.arch@...edance.com>
Cc: tglx@...utronix.de, david@...hat.com, jannh@...gle.com,
	hughd@...gle.com, yuzhao@...gle.com, willy@...radead.org,
	muchun.song@...ux.dev, vbabka@...nel.org,
	lorenzo.stoakes@...cle.com, akpm@...ux-foundation.org,
	rientjes@...gle.com, vishal.moola@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/15] mm: pgtable: remove tlb_remove_ptdesc()

On Wed, Dec 18, 2024 at 09:04:50PM +0800, Qi Zheng wrote:
> diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
> index 7052780740349..fba11949dd2ea 100644
> --- a/arch/s390/include/asm/tlb.h
> +++ b/arch/s390/include/asm/tlb.h
> @@ -86,7 +86,7 @@ static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
>  	tlb->cleared_pmds = 1;
>  	if (mm_alloc_pgste(tlb->mm))
>  		gmap_unlink(tlb->mm, (unsigned long *)pte, address);
> -	tlb_remove_ptdesc(tlb, pte);
> +	tlb_remove_table(tlb, pte);
>  }
>  
>  /*
> @@ -105,7 +105,7 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
>  	tlb->mm->context.flush_mm = 1;
>  	tlb->freed_tables = 1;
>  	tlb->cleared_puds = 1;
> -	tlb_remove_ptdesc(tlb, pmd);
> +	tlb_remove_table(tlb, pmd);
>  }
>  
>  /*
> @@ -123,7 +123,7 @@ static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
>  	tlb->mm->context.flush_mm = 1;
>  	tlb->freed_tables = 1;
>  	tlb->cleared_p4ds = 1;
> -	tlb_remove_ptdesc(tlb, pud);
> +	tlb_remove_table(tlb, pud);
>  }
>  
>  /*
> @@ -141,7 +141,7 @@ static inline void p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
>  	__tlb_adjust_range(tlb, address, PAGE_SIZE);
>  	tlb->mm->context.flush_mm = 1;
>  	tlb->freed_tables = 1;
> -	tlb_remove_ptdesc(tlb, p4d);
> +	tlb_remove_table(tlb, p4d);
>  }
>  
>  #endif /* _S390_TLB_H */

AFAICT these are all virtual addresses (still)


> diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
> index 8d6cfe5058543..583e95568f52b 100644
> --- a/include/asm-generic/tlb.h
> +++ b/include/asm-generic/tlb.h
> @@ -211,7 +211,7 @@ struct mmu_table_batch {
>  #ifndef __HAVE_ARCH_TLB_REMOVE_TABLE
>  static inline void __tlb_remove_table(void *table)
>  {
> -	struct ptdesc *ptdesc = (struct ptdesc *)table;
> +	struct ptdesc *ptdesc = page_ptdesc((struct page *)table);

And here you're assuming they're page pointers.

>  	pagetable_dtor(ptdesc);
>  	pagetable_free(ptdesc);