diff options
Diffstat (limited to 'arch/arm/include/asm/tlb.h')
| -rw-r--r-- | arch/arm/include/asm/tlb.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h index 0baf7f0d9394..470ef9e1e697 100644 --- a/arch/arm/include/asm/tlb.h +++ b/arch/arm/include/asm/tlb.h @@ -100,6 +100,14 @@ static inline void __tlb_alloc_page(struct mmu_gather *tlb) static inline void tlb_flush_mmu(struct mmu_gather *tlb) { + /* + * Before freeing pages, check to see whether or not + * __get_user_pages_fast is still walking pages in the mm. + * If this is the case, wait until gup has finished. + */ + while (atomic_read(&tlb->mm->context.gup_readers) != 0) + cpu_relax(); + tlb_flush(tlb); free_pages_and_swap_cache(tlb->pages, tlb->nr); tlb->nr = 0; |