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SubjectRe: [RFC PATCH 06/26] mm: make free_p?d_range functions public
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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@google.com>
reviewed-by: manish.mishra@nutanix.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)
> {

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