mm: clean up unmap_region() argument list

With the only caller to unmap_region() being the error path of
mmap_region(), the argument list can be significantly reduced.

Link: https://lkml.kernel.org/r/20240830040101.822209-14-Liam.Howlett@oracle.comSigned-off-by: Liam R. Howlett <Liam.Howlett@Oracle.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: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/mmap.c

@@ -1615,8 +1615,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 
 		vma_iter_set(&vmi, vma->vm_end);
 		/* Undo any partial mapping done by a device driver. */
-		unmap_region(mm, &vmi.mas, vma, prev, next, vma->vm_start,
-			     vma->vm_end, vma->vm_end, true);
+		unmap_region(&vmi.mas, vma, prev, next);
 	}
 	if (writable_file_mapping)
 		mapping_unmap_writable(file->f_mapping);

mm/vma.c

@@ -155,22 +155,21 @@ void remove_vma(struct vm_area_struct *vma, bool unreachable)
  *
  * Called with the mm semaphore held.
  */
-void unmap_region(struct mm_struct *mm, struct ma_state *mas,
-		struct vm_area_struct *vma, struct vm_area_struct *prev,
-		struct vm_area_struct *next, unsigned long start,
-		unsigned long end, unsigned long tree_end, bool mm_wr_locked)
+void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
+		struct vm_area_struct *prev, struct vm_area_struct *next)
 {
+	struct mm_struct *mm = vma->vm_mm;
 	struct mmu_gather tlb;
-	unsigned long mt_start = mas->index;
 
 	lru_add_drain();
 	tlb_gather_mmu(&tlb, mm);
 	update_hiwater_rss(mm);
-	unmap_vmas(&tlb, mas, vma, start, end, tree_end, mm_wr_locked);
-	mas_set(mas, mt_start);
+	unmap_vmas(&tlb, mas, vma, vma->vm_start, vma->vm_end, vma->vm_end,
+		   /* mm_wr_locked = */ true);
+	mas_set(mas, vma->vm_end);
 	free_pgtables(&tlb, mas, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS,
-				 next ? next->vm_start : USER_PGTABLES_CEILING,
-				 mm_wr_locked);
+		      next ? next->vm_start : USER_PGTABLES_CEILING,
+		      /* mm_wr_locked = */ true);
 	tlb_finish_mmu(&tlb);
 }
 

mm/vma.h

@@ -149,10 +149,8 @@ int do_vmi_munmap(struct vma_iterator *vmi, struct mm_struct *mm,
 
 void remove_vma(struct vm_area_struct *vma, bool unreachable);
 
-void unmap_region(struct mm_struct *mm, struct ma_state *mas,
-		struct vm_area_struct *vma, struct vm_area_struct *prev,
-		struct vm_area_struct *next, unsigned long start,
-		unsigned long end, unsigned long tree_end, bool mm_wr_locked);
+void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
+		struct vm_area_struct *prev, struct vm_area_struct *next);
 
 /* Required by mmap_region(). */
 bool