[PATCH v2 1/4] mm/pagewalk: delete the unused member

[xu.xin@linux.dev]

From: Xu Xin <xu.xin@linux.dev>

The 'vma' member of struct folio_walk has never been used since it was
introduced by commit aa39ca6940f1a ("mm/pagewalk: introduce
folio_walk_start() + folio_walk_end()").

The VMA is always passed to folio_walk_start() as a separate argument,
and neither folio_walk_start() nor folio_walk_end() ever reads or writes
fw->vma. I audited all the current users of struct folio_walk (the
callers of folio_walk_start()) and none of them assign to or read the
member, so it is safe to remove.

Signed-off-by: Xu Xin <xu.xin@linux.dev>
---
 include/linux/pagewalk.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/linux/pagewalk.h b/include/linux/pagewalk.h
index b41d7265c01b..1c397be0d092 100644
--- a/include/linux/pagewalk.h
+++ b/include/linux/pagewalk.h
@@ -183,7 +183,6 @@ struct folio_walk {
 		pmd_t pmd;
 	};
 	/* private */
-	struct vm_area_struct *vma;
 	spinlock_t *ptl;
 };
 
-- 
2.34.1