mm/vma: introduce vma_munmap_struct for use in munmap operations

Use a structure to pass along all the necessary information and counters
involved in removing vmas from the mm_struct.

Update vmi_ function names to vms_ to indicate the first argument type
change.

Link: https://lkml.kernel.org/r/20240830040101.822209-6-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Bert Karwatzki <spasswolf@web.de>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Jiri Olsa <olsajiri@gmail.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/mm/vma.h b/mm/vma.h
index da31d0f62157..cb67acf59012 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -26,6 +26,22 @@ struct unlink_vma_file_batch {
 	struct vm_area_struct *vmas[8];
 };
 
+/*
+ * vma munmap operation
+ */
+struct vma_munmap_struct {
+	struct vma_iterator *vmi;
+	struct mm_struct *mm;
+	struct vm_area_struct *vma;     /* The first vma to munmap */
+	struct list_head *uf;           /* Userfaultfd list_head */
+	unsigned long start;            /* Aligned start addr (inclusive) */
+	unsigned long end;              /* Aligned end addr (exclusive) */
+	int vma_count;                  /* Number of vmas that will be removed */
+	unsigned long nr_pages;         /* Number of pages being removed */
+	unsigned long locked_vm;        /* Number of locked pages */
+	bool unlock;                    /* Unlock after the munmap */
+};
+
 #ifdef CONFIG_DEBUG_VM_MAPLE_TREE
 void validate_mm(struct mm_struct *mm);
 #else