Benjamin Herrenschmidt writes:
> On Thu, 2016-06-02 at 15:16 +0530, Aneesh Kumar K.V wrote:
>>
>>
>> +/*
>> + * flush the page walk cache for the address
>> + */
>> +void flush_tlb_pgtable(struct mmu_gather *tlb, unsigned long address)
>> +{
>> + struct mm_struct *mm = tlb->mm;
>> +
On Thu, 2016-06-02 at 15:16 +0530, Aneesh Kumar K.V wrote:
>
>
> +/*
> + * flush the page walk cache for the address
> + */
> +void flush_tlb_pgtable(struct mmu_gather *tlb, unsigned long address)
> +{
> + struct mm_struct *mm = tlb->mm;
> + /*
> + * flush the page table walk c
Even though a tlb_flush() does a flush with invalidate all cache,
we can end up doing an RCU page table free, before calling tlb_flush().
That means we can have page walk cache entries even after we free the
page table pages. This can result in us doing wrong page table walk.
Avoid this by doing p
