[RFC PATCH 3/4] perf: Use vmalloc_to_folio()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Eliminate a use of page->mapping by using vmalloc_to_folio() instead.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/mm.h          | 5 +++++
 kernel/events/ring_buffer.c | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 840bae5f23b6..7d84a2843193 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1134,6 +1134,11 @@ int region_intersects(resource_size_t offset, size_t size, unsigned long flags,
 struct page *vmalloc_to_page(const void *addr);
 unsigned long vmalloc_to_pfn(const void *addr);
 
+static inline struct folio *vmalloc_to_folio(const void *addr)
+{
+	return page_folio(vmalloc_to_page(addr));
+}
+
 /*
  * Determine if an address is within the vmalloc range
  *
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index c73add132618..56939dc3bf33 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -873,9 +873,9 @@ __perf_mmap_to_page(struct perf_buffer *rb, unsigned long pgoff)
 
 static void perf_mmap_unmark_page(void *addr)
 {
-	struct page *page = vmalloc_to_page(addr);
+	struct folio *folio = vmalloc_to_folio(addr);
 
-	page->mapping = NULL;
+	folio->mapping = NULL;
 }
 
 static void rb_free_work(struct work_struct *work)
-- 
2.40.1