Commit 3e455cf5 authored Dec 25, 2020 by Guo Ren

csky: Fixup update_mmu_cache called with user io mapping



The function update_mmu_cache could be called by user-io mapping.
There is no space of struct page in mem_map for the pte. Just
ignore the user-io mmaping in update_mmu_cache.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>

parent 78bfa70b

arch/csky/abiv2/cacheflush.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -12,6 +12,9 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
		unsigned long addr;
		struct page *page;

		if (!pfn_valid(pte_pfn(*pte)))
		return;

		page = pfn_to_page(pte_pfn(*pte));
		if (page == ZERO_PAGE(0))
		return;