[PATCH 6.10 629/634] mm: change vmf_anon_prepare() to __vmf_anon_prepare()

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6.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>

commit 2a058ab3286d6475b2082b90c2d2182d2fea4b39 upstream.

Some callers of vmf_anon_prepare() may not want us to release the per-VMA
lock ourselves.  Rename vmf_anon_prepare() to __vmf_anon_prepare() and let
the callers drop the lock when desired.

Also, make vmf_anon_prepare() a wrapper that releases the per-VMA lock
itself for any callers that don't care.

This is in preparation to fix this bug reported by syzbot:
https://lore.kernel.org/linux-mm/00000000000067c20b06219fbc26@xxxxxxxxxx/

Link: https://lkml.kernel.org/r/20240914194243.245-1-vishal.moola@xxxxxxxxx
Fixes: 9acad7ba3e25 ("hugetlb: use vmf_anon_prepare() instead of anon_vma_prepare()")
Reported-by: syzbot+2dab93857ee95f2eeb08@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://lore.kernel.org/linux-mm/00000000000067c20b06219fbc26@xxxxxxxxxx/
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 mm/internal.h |   11 ++++++++++-
 mm/memory.c   |    8 +++-----
 2 files changed, 13 insertions(+), 6 deletions(-)

--- a/mm/internal.h
+++ b/mm/internal.h
@@ -293,7 +293,16 @@ static inline void wake_throttle_isolate
 		wake_up(wqh);
 }
 
-vm_fault_t vmf_anon_prepare(struct vm_fault *vmf);
+vm_fault_t __vmf_anon_prepare(struct vm_fault *vmf);
+static inline vm_fault_t vmf_anon_prepare(struct vm_fault *vmf)
+{
+	vm_fault_t ret = __vmf_anon_prepare(vmf);
+
+	if (unlikely(ret & VM_FAULT_RETRY))
+		vma_end_read(vmf->vma);
+	return ret;
+}
+
 vm_fault_t do_swap_page(struct vm_fault *vmf);
 void folio_rotate_reclaimable(struct folio *folio);
 bool __folio_end_writeback(struct folio *folio);
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3226,7 +3226,7 @@ static inline vm_fault_t vmf_can_call_fa
 }
 
 /**
- * vmf_anon_prepare - Prepare to handle an anonymous fault.
+ * __vmf_anon_prepare - Prepare to handle an anonymous fault.
  * @vmf: The vm_fault descriptor passed from the fault handler.
  *
  * When preparing to insert an anonymous page into a VMA from a
@@ -3240,7 +3240,7 @@ static inline vm_fault_t vmf_can_call_fa
  * Return: 0 if fault handling can proceed.  Any other value should be
  * returned to the caller.
  */
-vm_fault_t vmf_anon_prepare(struct vm_fault *vmf)
+vm_fault_t __vmf_anon_prepare(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	vm_fault_t ret = 0;
@@ -3248,10 +3248,8 @@ vm_fault_t vmf_anon_prepare(struct vm_fa
 	if (likely(vma->anon_vma))
 		return 0;
 	if (vmf->flags & FAULT_FLAG_VMA_LOCK) {
-		if (!mmap_read_trylock(vma->vm_mm)) {
-			vma_end_read(vma);
+		if (!mmap_read_trylock(vma->vm_mm))
 			return VM_FAULT_RETRY;
-		}
 	}
 	if (__anon_vma_prepare(vma))
 		ret = VM_FAULT_OOM;






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