Re: [PATCH 4/4] mm/memory: convert do_read_fault() to use folios

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On 2023/7/3 13:58, Sidhartha Kumar wrote:

Saves one implicit call to compound_head()

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>

Reviewed-by: ZhangPeng <zhangpeng362@xxxxxxxxxx>

---
  mm/memory.c | 5 +++--
  1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 33bf13431974c..b97c66df4adac 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4528,6 +4528,7 @@ static inline bool should_fault_around(struct vm_fault *vmf)
  static vm_fault_t do_read_fault(struct vm_fault *vmf)
  {
  	vm_fault_t ret = 0;
+	struct folio *folio = page_folio(vmf->page);
/*
  	 * Let's call ->map_pages() first and use ->fault() as fallback
@@ -4545,9 +4546,9 @@ static vm_fault_t do_read_fault(struct vm_fault *vmf)
  		return ret;
ret |= finish_fault(vmf);
-	unlock_page(vmf->page);
+	folio_unlock(folio);
  	if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
-		put_page(vmf->page);
+		folio_put(folio);
  	return ret;
  }




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