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LoongArch: Replace kmap_atomic() with kmap_local_page() in copy_user_highpage()

Message ID 20231007095229.235551-1-chenhuacai@loongson.cn
State New
Headers
Series LoongArch: Replace kmap_atomic() with kmap_local_page() in copy_user_highpage() |

Commit Message

Huacai Chen Oct. 7, 2023, 9:52 a.m. UTC 
  Replace kmap_atomic()/kunmap_atomic() calls with kmap_local_page()/
kunmap_local() in copy_user_highpage() which can be invoked from both
preemptible and atomic context [1].

[1] https://lore.kernel.org/all/20201029222652.302358281@linutronix.de/

Suggested-by: Deepak R Varma <drv@mailo.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
 arch/loongarch/mm/init.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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Patch

diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
index ddf1330c924c..4dd53427f657 100644
--- a/arch/loongarch/mm/init.c
+++ b/arch/loongarch/mm/init.c
@@ -43,11 +43,11 @@  void copy_user_highpage(struct page *to, struct page *from,
 {
 	void *vfrom, *vto;
 
-	vto = kmap_atomic(to);
-	vfrom = kmap_atomic(from);
+	vfrom = kmap_local_page(from);
+	vto = kmap_local_page(to);
 	copy_page(vto, vfrom);
-	kunmap_atomic(vfrom);
-	kunmap_atomic(vto);
+	kunmap_local(vfrom);
+	kunmap_local(vto);
 	/* Make sure this page is cleared on other CPU's too before using it */
 	smp_wmb();
 }