linux-kernel - Re: [PATCH 2/4] riscv: tlb: convert __p*d_free

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Message-ID: <dc5e01b7-010b-4fc7-867b-b738a05becd9@ghiti.fr>
Date: Sun, 31 Dec 2023 07:24:22 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Jisheng Zhang <jszhang@...nel.org>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Will Deacon <will@...nel.org>,
 "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Nick Piggin <npiggin@...il.com>,
 Peter Zijlstra <peterz@...radead.org>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/4] riscv: tlb: convert __p*d_free_tlb() to inline
 functions

On 19/12/2023 18:50, Jisheng Zhang wrote:
> This is to prepare for enabling MMU_GATHER_RCU_TABLE_FREE.
> No functionality changes.
>
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>   arch/riscv/include/asm/pgalloc.h | 54 +++++++++++++++++++-------------
>   1 file changed, 32 insertions(+), 22 deletions(-)
>
> diff --git a/arch/riscv/include/asm/pgalloc.h b/arch/riscv/include/asm/pgalloc.h
> index a12fb83fa1f5..3c5e3bd15f46 100644
> --- a/arch/riscv/include/asm/pgalloc.h
> +++ b/arch/riscv/include/asm/pgalloc.h
> @@ -95,13 +95,16 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud)
>   		__pud_free(mm, pud);
>   }
>   
> -#define __pud_free_tlb(tlb, pud, addr)					\
> -do {									\
> -	if (pgtable_l4_enabled) {					\
> -		pagetable_pud_dtor(virt_to_ptdesc(pud));		\
> -		tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pud));	\
> -	}								\
> -} while (0)
> +static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
> +				  unsigned long addr)
> +{
> +	if (pgtable_l4_enabled) {
> +		struct ptdesc *ptdesc = virt_to_ptdesc(pud);
> +
> +		pagetable_pud_dtor(ptdesc);
> +		tlb_remove_page_ptdesc(tlb, ptdesc);
> +	}
> +}
>   
>   #define p4d_alloc_one p4d_alloc_one
>   static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
> @@ -130,11 +133,12 @@ static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
>   		__p4d_free(mm, p4d);
>   }
>   
> -#define __p4d_free_tlb(tlb, p4d, addr)					\
> -do {									\
> -	if (pgtable_l5_enabled)						\
> -		tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(p4d));	\
> -} while (0)
> +static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
> +				  unsigned long addr)
> +{
> +	if (pgtable_l5_enabled)
> +		tlb_remove_page_ptdesc(tlb, virt_to_ptdesc(p4d));
> +}
>   #endif /* __PAGETABLE_PMD_FOLDED */
>   
>   static inline void sync_kernel_mappings(pgd_t *pgd)
> @@ -159,19 +163,25 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
>   
>   #ifndef __PAGETABLE_PMD_FOLDED
>   
> -#define __pmd_free_tlb(tlb, pmd, addr)				\
> -do {								\
> -	pagetable_pmd_dtor(virt_to_ptdesc(pmd));		\
> -	tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pmd));	\
> -} while (0)
> +static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
> +				  unsigned long addr)
> +{
> +	struct ptdesc *ptdesc = virt_to_ptdesc(pmd);
> +
> +	pagetable_pmd_dtor(ptdesc);
> +	tlb_remove_page_ptdesc(tlb, ptdesc);
> +}
>   
>   #endif /* __PAGETABLE_PMD_FOLDED */
>   
> -#define __pte_free_tlb(tlb, pte, buf)			\
> -do {							\
> -	pagetable_pte_dtor(page_ptdesc(pte));		\
> -	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));\
> -} while (0)
> +static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
> +				  unsigned long addr)
> +{
> +	struct ptdesc *ptdesc = page_ptdesc(pte);
> +
> +	pagetable_pte_dtor(ptdesc);
> +	tlb_remove_page_ptdesc(tlb, ptdesc);
> +}
>   #endif /* CONFIG_MMU */
>   
>   #endif /* _ASM_RISCV_PGALLOC_H */


You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks,

Alex