[PATCH v2 2/5] mm: userfaultfd: don't pass around both mm and vma

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Quite a few userfaultfd functions took both mm and vma pointers as
arguments. Since the mm is trivially accessible via vma->vm_mm, there's
no reason to pass both; it just needlessly extends the already long
argument list.

Get rid of the mm pointer, where possible, to shorten the argument list.

Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
---
 fs/userfaultfd.c              |  2 +-
 include/linux/hugetlb.h       |  5 ++-
 include/linux/shmem_fs.h      |  4 +--
 include/linux/userfaultfd_k.h |  4 +--
 mm/hugetlb.c                  |  9 +++--
 mm/shmem.c                    |  7 ++--
 mm/userfaultfd.c              | 66 ++++++++++++++++-------------------
 7 files changed, 45 insertions(+), 52 deletions(-)

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index c08a26ae77d6..a95f6aaef76b 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -1637,7 +1637,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
 
 		/* Reset ptes for the whole vma range if wr-protected */
 		if (userfaultfd_wp(vma))
-			uffd_wp_range(mm, vma, start, vma_end - start, false);
+			uffd_wp_range(vma, start, vma_end - start, false);
 
 		new_flags = vma->vm_flags & ~__VM_UFFD_FLAGS;
 		prev = vma_merge(mm, prev, start, vma_end, new_flags,
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 3c389b74e02d..d3fc104aab78 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -157,7 +157,7 @@ unsigned long hugetlb_total_pages(void);
 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 			unsigned long address, unsigned int flags);
 #ifdef CONFIG_USERFAULTFD
-int hugetlb_mfill_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
+int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
 			     struct vm_area_struct *dst_vma,
 			     unsigned long dst_addr,
 			     unsigned long src_addr,
@@ -355,8 +355,7 @@ static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
 }
 
 #ifdef CONFIG_USERFAULTFD
-static inline int hugetlb_mfill_atomic_pte(struct mm_struct *dst_mm,
-					   pte_t *dst_pte,
+static inline int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
 					   struct vm_area_struct *dst_vma,
 					   unsigned long dst_addr,
 					   unsigned long src_addr,
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index d500ea967dc7..2a0b1dc0460f 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -149,14 +149,14 @@ extern void shmem_uncharge(struct inode *inode, long pages);
 
 #ifdef CONFIG_USERFAULTFD
 #ifdef CONFIG_SHMEM
-extern int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
+extern int shmem_mfill_atomic_pte(pmd_t *dst_pmd,
 				  struct vm_area_struct *dst_vma,
 				  unsigned long dst_addr,
 				  unsigned long src_addr,
 				  bool zeropage, bool wp_copy,
 				  struct page **pagep);
 #else /* !CONFIG_SHMEM */
-#define shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, \
+#define shmem_mfill_atomic_pte(dst_pmd, dst_vma, dst_addr, \
 			       src_addr, zeropage, wp_copy, pagep) ({ BUG(); 0; })
 #endif /* CONFIG_SHMEM */
 #endif /* CONFIG_USERFAULTFD */
diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
index 6c5ad5d4aa06..c6c23408d300 100644
--- a/include/linux/userfaultfd_k.h
+++ b/include/linux/userfaultfd_k.h
@@ -56,7 +56,7 @@ enum mcopy_atomic_mode {
 	MCOPY_ATOMIC_CONTINUE,
 };
 
-extern int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
+extern int mfill_atomic_install_pte(pmd_t *dst_pmd,
 				    struct vm_area_struct *dst_vma,
 				    unsigned long dst_addr, struct page *page,
 				    bool newly_allocated, bool wp_copy);
@@ -73,7 +73,7 @@ extern ssize_t mfill_atomic_continue(struct mm_struct *dst_mm, unsigned long dst
 extern int mwriteprotect_range(struct mm_struct *dst_mm,
 			       unsigned long start, unsigned long len,
 			       bool enable_wp, atomic_t *mmap_changing);
-extern void uffd_wp_range(struct mm_struct *dst_mm, struct vm_area_struct *vma,
+extern void uffd_wp_range(struct vm_area_struct *vma,
 			  unsigned long start, unsigned long len, bool enable_wp);
 
 /* mm helpers */
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 915a390442e7..0afd2ed8ad39 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6162,8 +6162,7 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  * Used by userfaultfd UFFDIO_* ioctls. Based on userfaultfd's mfill_atomic_pte
  * with modifications for hugetlb pages.
  */
-int hugetlb_mfill_atomic_pte(struct mm_struct *dst_mm,
-			     pte_t *dst_pte,
+int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
 			     struct vm_area_struct *dst_vma,
 			     unsigned long dst_addr,
 			     unsigned long src_addr,
@@ -6282,7 +6281,7 @@ int hugetlb_mfill_atomic_pte(struct mm_struct *dst_mm,
 		page_in_pagecache = true;
 	}
 
-	ptl = huge_pte_lock(h, dst_mm, dst_pte);
+	ptl = huge_pte_lock(h, dst_vma->vm_mm, dst_pte);
 
 	ret = -EIO;
 	if (PageHWPoison(page))
@@ -6324,9 +6323,9 @@ int hugetlb_mfill_atomic_pte(struct mm_struct *dst_mm,
 	if (wp_copy)
 		_dst_pte = huge_pte_mkuffd_wp(_dst_pte);
 
-	set_huge_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
+	set_huge_pte_at(dst_vma->vm_mm, dst_addr, dst_pte, _dst_pte);
 
-	hugetlb_count_add(pages_per_huge_page(h), dst_mm);
+	hugetlb_count_add(pages_per_huge_page(h), dst_vma->vm_mm);
 
 	/* No need to invalidate - it was non-present before */
 	update_mmu_cache(dst_vma, dst_addr, dst_pte);
diff --git a/mm/shmem.c b/mm/shmem.c
index 41f82c5a5e28..cc03c61190eb 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2398,8 +2398,7 @@ static struct inode *shmem_get_inode(struct mnt_idmap *idmap, struct super_block
 }
 
 #ifdef CONFIG_USERFAULTFD
-int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
-			   pmd_t *dst_pmd,
+int shmem_mfill_atomic_pte(pmd_t *dst_pmd,
 			   struct vm_area_struct *dst_vma,
 			   unsigned long dst_addr,
 			   unsigned long src_addr,
@@ -2489,11 +2488,11 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
 		goto out_release;
 
 	ret = shmem_add_to_page_cache(folio, mapping, pgoff, NULL,
-				      gfp & GFP_RECLAIM_MASK, dst_mm);
+				      gfp & GFP_RECLAIM_MASK, dst_vma->vm_mm);
 	if (ret)
 		goto out_release;
 
-	ret = mfill_atomic_install_pte(dst_mm, dst_pmd, dst_vma, dst_addr,
+	ret = mfill_atomic_install_pte(dst_pmd, dst_vma, dst_addr,
 				       &folio->page, true, wp_copy);
 	if (ret)
 		goto out_delete_from_cache;
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 3980e1b7b7f8..4bf5c97c665a 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -55,7 +55,7 @@ struct vm_area_struct *find_dst_vma(struct mm_struct *dst_mm,
  * This function handles both MCOPY_ATOMIC_NORMAL and _CONTINUE for both shmem
  * and anon, and for both shared and private VMAs.
  */
-int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
+int mfill_atomic_install_pte(pmd_t *dst_pmd,
 			     struct vm_area_struct *dst_vma,
 			     unsigned long dst_addr, struct page *page,
 			     bool newly_allocated, bool wp_copy)
@@ -93,7 +93,7 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
 		 */
 		_dst_pte = pte_wrprotect(_dst_pte);
 
-	dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
+	dst_pte = pte_offset_map_lock(dst_vma->vm_mm, dst_pmd, dst_addr, &ptl);
 
 	if (vma_is_shmem(dst_vma)) {
 		/* serialize against truncate with the page table lock */
@@ -129,9 +129,9 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
 	 * Must happen after rmap, as mm_counter() checks mapping (via
 	 * PageAnon()), which is set by __page_set_anon_rmap().
 	 */
-	inc_mm_counter(dst_mm, mm_counter(page));
+	inc_mm_counter(dst_vma->vm_mm, mm_counter(page));
 
-	set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
+	set_pte_at(dst_vma->vm_mm, dst_addr, dst_pte, _dst_pte);
 
 	/* No need to invalidate - it was non-present before */
 	update_mmu_cache(dst_vma, dst_addr, dst_pte);
@@ -141,8 +141,7 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
 	return ret;
 }
 
-static int mfill_atomic_pte_copy(struct mm_struct *dst_mm,
-				 pmd_t *dst_pmd,
+static int mfill_atomic_pte_copy(pmd_t *dst_pmd,
 				 struct vm_area_struct *dst_vma,
 				 unsigned long dst_addr,
 				 unsigned long src_addr,
@@ -204,10 +203,10 @@ static int mfill_atomic_pte_copy(struct mm_struct *dst_mm,
 	__SetPageUptodate(page);
 
 	ret = -ENOMEM;
-	if (mem_cgroup_charge(page_folio(page), dst_mm, GFP_KERNEL))
+	if (mem_cgroup_charge(page_folio(page), dst_vma->vm_mm, GFP_KERNEL))
 		goto out_release;
 
-	ret = mfill_atomic_install_pte(dst_mm, dst_pmd, dst_vma, dst_addr,
+	ret = mfill_atomic_install_pte(dst_pmd, dst_vma, dst_addr,
 				       page, true, wp_copy);
 	if (ret)
 		goto out_release;
@@ -218,8 +217,7 @@ static int mfill_atomic_pte_copy(struct mm_struct *dst_mm,
 	goto out;
 }
 
-static int mfill_atomic_pte_zeropage(struct mm_struct *dst_mm,
-				     pmd_t *dst_pmd,
+static int mfill_atomic_pte_zeropage(pmd_t *dst_pmd,
 				     struct vm_area_struct *dst_vma,
 				     unsigned long dst_addr)
 {
@@ -231,7 +229,7 @@ static int mfill_atomic_pte_zeropage(struct mm_struct *dst_mm,
 
 	_dst_pte = pte_mkspecial(pfn_pte(my_zero_pfn(dst_addr),
 					 dst_vma->vm_page_prot));
-	dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
+	dst_pte = pte_offset_map_lock(dst_vma->vm_mm, dst_pmd, dst_addr, &ptl);
 	if (dst_vma->vm_file) {
 		/* the shmem MAP_PRIVATE case requires checking the i_size */
 		inode = dst_vma->vm_file->f_inode;
@@ -244,7 +242,7 @@ static int mfill_atomic_pte_zeropage(struct mm_struct *dst_mm,
 	ret = -EEXIST;
 	if (!pte_none(*dst_pte))
 		goto out_unlock;
-	set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
+	set_pte_at(dst_vma->vm_mm, dst_addr, dst_pte, _dst_pte);
 	/* No need to invalidate - it was non-present before */
 	update_mmu_cache(dst_vma, dst_addr, dst_pte);
 	ret = 0;
@@ -254,8 +252,7 @@ static int mfill_atomic_pte_zeropage(struct mm_struct *dst_mm,
 }
 
 /* Handles UFFDIO_CONTINUE for all shmem VMAs (shared or private). */
-static int mfill_atomic_pte_continue(struct mm_struct *dst_mm,
-				     pmd_t *dst_pmd,
+static int mfill_atomic_pte_continue(pmd_t *dst_pmd,
 				     struct vm_area_struct *dst_vma,
 				     unsigned long dst_addr,
 				     bool wp_copy)
@@ -283,7 +280,7 @@ static int mfill_atomic_pte_continue(struct mm_struct *dst_mm,
 		goto out_release;
 	}
 
-	ret = mfill_atomic_install_pte(dst_mm, dst_pmd, dst_vma, dst_addr,
+	ret = mfill_atomic_install_pte(dst_pmd, dst_vma, dst_addr,
 				       page, false, wp_copy);
 	if (ret)
 		goto out_release;
@@ -324,7 +321,7 @@ static pmd_t *mm_alloc_pmd(struct mm_struct *mm, unsigned long address)
  * mfill_atomic processing for HUGETLB vmas.  Note that this routine is
  * called with mmap_lock held, it will release mmap_lock before returning.
  */
-static __always_inline ssize_t mfill_atomic_hugetlb(struct mm_struct *dst_mm,
+static __always_inline ssize_t mfill_atomic_hugetlb(
 					      struct vm_area_struct *dst_vma,
 					      unsigned long dst_start,
 					      unsigned long src_start,
@@ -332,6 +329,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb(struct mm_struct *dst_mm,
 					      enum mcopy_atomic_mode mode,
 					      bool wp_copy)
 {
+	struct mm_struct *dst_mm = dst_vma->vm_mm;
 	int vm_shared = dst_vma->vm_flags & VM_SHARED;
 	ssize_t err;
 	pte_t *dst_pte;
@@ -425,7 +423,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb(struct mm_struct *dst_mm,
 			goto out_unlock;
 		}
 
-		err = hugetlb_mfill_atomic_pte(dst_mm, dst_pte, dst_vma,
+		err = hugetlb_mfill_atomic_pte(dst_pte, dst_vma,
 					       dst_addr, src_addr, mode, &page,
 					       wp_copy);
 
@@ -477,17 +475,15 @@ static __always_inline ssize_t mfill_atomic_hugetlb(struct mm_struct *dst_mm,
 }
 #else /* !CONFIG_HUGETLB_PAGE */
 /* fail at build time if gcc attempts to use this */
-extern ssize_t mfill_atomic_hugetlb(struct mm_struct *dst_mm,
-				      struct vm_area_struct *dst_vma,
-				      unsigned long dst_start,
-				      unsigned long src_start,
-				      unsigned long len,
-				      enum mcopy_atomic_mode mode,
-				      bool wp_copy);
+extern ssize_t mfill_atomic_hugetlb(struct vm_area_struct *dst_vma,
+				    unsigned long dst_start,
+				    unsigned long src_start,
+				    unsigned long len,
+				    enum mcopy_atomic_mode mode,
+				    bool wp_copy);
 #endif /* CONFIG_HUGETLB_PAGE */
 
-static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm,
-						pmd_t *dst_pmd,
+static __always_inline ssize_t mfill_atomic_pte(pmd_t *dst_pmd,
 						struct vm_area_struct *dst_vma,
 						unsigned long dst_addr,
 						unsigned long src_addr,
@@ -498,7 +494,7 @@ static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm,
 	ssize_t err;
 
 	if (mode == MCOPY_ATOMIC_CONTINUE) {
-		return mfill_atomic_pte_continue(dst_mm, dst_pmd, dst_vma,
+		return mfill_atomic_pte_continue(dst_pmd, dst_vma,
 						 dst_addr, wp_copy);
 	}
 
@@ -514,14 +510,14 @@ static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm,
 	 */
 	if (!(dst_vma->vm_flags & VM_SHARED)) {
 		if (mode == MCOPY_ATOMIC_NORMAL)
-			err = mfill_atomic_pte_copy(dst_mm, dst_pmd, dst_vma,
+			err = mfill_atomic_pte_copy(dst_pmd, dst_vma,
 						    dst_addr, src_addr, page,
 						    wp_copy);
 		else
-			err = mfill_atomic_pte_zeropage(dst_mm, dst_pmd,
+			err = mfill_atomic_pte_zeropage(dst_pmd,
 						 dst_vma, dst_addr);
 	} else {
-		err = shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma,
+		err = shmem_mfill_atomic_pte(dst_pmd, dst_vma,
 					     dst_addr, src_addr,
 					     mode != MCOPY_ATOMIC_NORMAL,
 					     wp_copy, page);
@@ -602,7 +598,7 @@ static __always_inline ssize_t mfill_atomic(struct mm_struct *dst_mm,
 	 * If this is a HUGETLB vma, pass off to appropriate routine
 	 */
 	if (is_vm_hugetlb_page(dst_vma))
-		return  mfill_atomic_hugetlb(dst_mm, dst_vma, dst_start,
+		return  mfill_atomic_hugetlb(dst_vma, dst_start,
 					     src_start, len, mcopy_mode,
 					     wp_copy);
 
@@ -655,7 +651,7 @@ static __always_inline ssize_t mfill_atomic(struct mm_struct *dst_mm,
 		BUG_ON(pmd_none(*dst_pmd));
 		BUG_ON(pmd_trans_huge(*dst_pmd));
 
-		err = mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr,
+		err = mfill_atomic_pte(dst_pmd, dst_vma, dst_addr,
 				       src_addr, &page, mcopy_mode, wp_copy);
 		cond_resched();
 
@@ -724,7 +720,7 @@ ssize_t mfill_atomic_continue(struct mm_struct *dst_mm, unsigned long start,
 			    mmap_changing, 0);
 }
 
-void uffd_wp_range(struct mm_struct *dst_mm, struct vm_area_struct *dst_vma,
+void uffd_wp_range(struct vm_area_struct *dst_vma,
 		   unsigned long start, unsigned long len, bool enable_wp)
 {
 	struct mmu_gather tlb;
@@ -735,7 +731,7 @@ void uffd_wp_range(struct mm_struct *dst_mm, struct vm_area_struct *dst_vma,
 	else
 		newprot = vm_get_page_prot(dst_vma->vm_flags);
 
-	tlb_gather_mmu(&tlb, dst_mm);
+	tlb_gather_mmu(&tlb, dst_vma->vm_mm);
 	change_protection(&tlb, dst_vma, start, start + len, newprot,
 			  enable_wp ? MM_CP_UFFD_WP : MM_CP_UFFD_WP_RESOLVE);
 	tlb_finish_mmu(&tlb);
@@ -786,7 +782,7 @@ int mwriteprotect_range(struct mm_struct *dst_mm, unsigned long start,
 			goto out_unlock;
 	}
 
-	uffd_wp_range(dst_mm, dst_vma, start, len, enable_wp);
+	uffd_wp_range(dst_vma, start, len, enable_wp);
 
 	err = 0;
 out_unlock:
-- 
2.39.2.637.g21b0678d19-goog




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