linux-kernel - Re: [RFC PATCH 06/26] mm: make free_p?d

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Message-ID: <81ef275e-7119-e802-3563-814a6811b857@nutanix.com>
Date:   Mon, 27 Jun 2022 18:01:56 +0530
From:   "manish.mishra" <manish.mishra@...anix.com>
To:     James Houghton <jthoughton@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Peter Xu <peterx@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Jue Wang <juew@...gle.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 06/26] mm: make free_p?d_range functions public


On 24/06/22 11:06 pm, James Houghton wrote:
> This makes them usable for HugeTLB page table freeing operations.
> After HugeTLB high-granularity mapping, the page table for a HugeTLB VMA
> can get more complex, and these functions handle freeing page tables
> generally.
>
> Signed-off-by: James Houghton <jthoughton@...gle.com>
reviewed-by: manish.mishra@...anix.com
> ---
>   include/linux/mm.h | 7 +++++++
>   mm/memory.c        | 8 ++++----
>   2 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index bc8f326be0ce..07f5da512147 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1847,6 +1847,13 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
>   
>   struct mmu_notifier_range;
>   
> +void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd, unsigned long addr);
> +void free_pmd_range(struct mmu_gather *tlb, pud_t *pud, unsigned long addr,
> +		unsigned long end, unsigned long floor, unsigned long ceiling);
> +void free_pud_range(struct mmu_gather *tlb, p4d_t *p4d, unsigned long addr,
> +		unsigned long end, unsigned long floor, unsigned long ceiling);
> +void free_p4d_range(struct mmu_gather *tlb, pgd_t *pgd, unsigned long addr,
> +		unsigned long end, unsigned long floor, unsigned long ceiling);
>   void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
>   		unsigned long end, unsigned long floor, unsigned long ceiling);
>   int
> diff --git a/mm/memory.c b/mm/memory.c
> index 7a089145cad4..bb3b9b5b94fb 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -227,7 +227,7 @@ static void check_sync_rss_stat(struct task_struct *task)
>    * Note: this doesn't free the actual pages themselves. That
>    * has been handled earlier when unmapping all the memory regions.
>    */
> -static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
> +void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
>   			   unsigned long addr)
>   {
>   	pgtable_t token = pmd_pgtable(*pmd);
> @@ -236,7 +236,7 @@ static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
>   	mm_dec_nr_ptes(tlb->mm);
>   }
>   
> -static inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
> +inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
>   				unsigned long addr, unsigned long end,
>   				unsigned long floor, unsigned long ceiling)
>   {
> @@ -270,7 +270,7 @@ static inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
>   	mm_dec_nr_pmds(tlb->mm);
>   }
>   
> -static inline void free_pud_range(struct mmu_gather *tlb, p4d_t *p4d,
> +inline void free_pud_range(struct mmu_gather *tlb, p4d_t *p4d,
>   				unsigned long addr, unsigned long end,
>   				unsigned long floor, unsigned long ceiling)
>   {
> @@ -304,7 +304,7 @@ static inline void free_pud_range(struct mmu_gather *tlb, p4d_t *p4d,
>   	mm_dec_nr_puds(tlb->mm);
>   }
>   
> -static inline void free_p4d_range(struct mmu_gather *tlb, pgd_t *pgd,
> +inline void free_p4d_range(struct mmu_gather *tlb, pgd_t *pgd,
>   				unsigned long addr, unsigned long end,
>   				unsigned long floor, unsigned long ceiling)
>   {