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csky: Fixup update_mmu_cache called with user io mapping

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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>
This commit is contained in:
Guo Ren 2020-12-25 06:37:08 +00:00
parent 78bfa70b16
commit 3e455cf5f3
1 changed files with 3 additions and 0 deletions
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3
arch/csky/abiv2/cacheflush.c
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@ -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;