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

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Date:   Fri, 24 Jun 2022 17:36:36 +0000
From:   James Houghton <jthoughton@...gle.com>
To:     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>,
        Manish Mishra <manish.mishra@...anix.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        James Houghton <jthoughton@...gle.com>
Subject: [RFC PATCH 06/26] mm: make free_p?d_range functions public

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>
---
 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)
 {
-- 
2.37.0.rc0.161.g10f37bed90-goog