linux-kernel - [PATCH v5.1 13/19] mm/mmap: Clean up unmap

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Message-ID: <20240816111405.11793-14-spasswolf@web.de>
Date: Fri, 16 Aug 2024 13:13:54 +0200
From: Bert Karwatzki <spasswolf@....de>
To: "Liam R . Howlett" <Liam.Howlett@...cle.com>
Cc: Bert Karwatzki <spasswolf@....de>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Matthew Wilcox <willy@...radead.org>,
	sidhartha.kumar@...cle.com,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Jiri Olsa <olsajiri@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <kees@...nel.org>,
	Jeff Xu <jeffxu@...omium.org>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Subject: [PATCH v5.1 13/19] mm/mmap: 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.

There is also no need to forward declare the static function any
longer.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
---
 mm/mmap.c |  3 +--
 mm/vma.c  | 17 ++++++++---------
 mm/vma.h  |  6 ++----
 3 files changed, 11 insertions(+), 15 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 6720b55b47ed..1f0b8dc5a089 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1617,8 +1617,7 @@ 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);
diff --git a/mm/vma.c b/mm/vma.c
index e106d412c4c3..0244320d76ab 100644
--- a/mm/vma.c
+++ b/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);
 }

diff --git a/mm/vma.h b/mm/vma.h
index b857e7dc4bfe..2a2ca489e622 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -108,10 +108,8 @@ 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
--
2.45.2