6.1-stable review patch. If anyone has any objections, please let me know.
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From: Huacai Chen chenhuacai@loongson.cn
[ Upstream commit 477a0ebec101359f49d92796e3b609857d564b52 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/loongarch/mm/init.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c index c74da7770e39e..f42a3be5f28d7 100644 --- a/arch/loongarch/mm/init.c +++ b/arch/loongarch/mm/init.c @@ -68,11 +68,11 @@ 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(); }