Commit 477a0ebe authored by Huacai Chen's avatar Huacai Chen
Browse files

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

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: default avatarDeepak R Varma <drv@mailo.com>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 449c2756

arch/loongarch/mm/init.c

+4 −4
Original line number Diff line number Diff line
@@ -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();

}