diff options
| author | Guo Ren | 2020-12-25 06:37:08 +0000 |
|---|---|---|
| committer | Guo Ren | 2021-01-12 09:52:41 +0800 |
| commit | 3e455cf5f30f87bc871d5fe891841a2cefb29234 (patch) | |
| tree | d7d797cfcfd2e778d85aa4d70e6f1cbd6f87bdba /arch | |
| parent | 78bfa70b16e6db0144a27a10a57348ab967738b6 (diff) | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/csky/abiv2/cacheflush.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/csky/abiv2/cacheflush.c b/arch/csky/abiv2/cacheflush.c index 790f1ebfba44..39c51399dd81 100644 --- a/arch/csky/abiv2/cacheflush.c +++ b/arch/csky/abiv2/cacheflush.c @@ -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; |