On 2022/6/28 22:59, Muchun Song wrote:
> On Tue, Jun 28, 2022 at 09:28:23PM +0800, Miaohe Lin wrote:
>> Use helper touch_pud to set pud accessed to simplify the code and improve
>> the readability. No functional change intended.
>>
>> Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
>> ---
>> mm/huge_memory.c | 16 ++++------------
>> 1 file changed, 4 insertions(+), 12 deletions(-)
>>
>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
>> index f7164ef8b6e3..d55d5efa06c8 100644
>> --- a/mm/huge_memory.c
>> +++ b/mm/huge_memory.c
>> @@ -1284,15 +1284,15 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
>>
>> #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
>> static void touch_pud(struct vm_area_struct *vma, unsigned long addr,
>> - pud_t *pud, int flags)
>> + pud_t *pud, bool write)
>
> You have change the last parameter. Have you forgotten to update its user
> of follow_devmap_pud()?
My bad. I was overloaded yesterday. Thanks for catching this!
Will change it in next version.
>
> Thanks.
>
>> {
>> pud_t _pud;
>>
>> _pud = pud_mkyoung(*pud);
>> - if (flags & FOLL_WRITE)
>> + if (write)
>> _pud = pud_mkdirty(_pud);
>> if (pudp_set_access_flags(vma, addr & HPAGE_PUD_MASK,
>> - pud, _pud, flags & FOLL_WRITE))
>> + pud, _pud, write))
>> update_mmu_cache_pud(vma, addr, pud);
>> }
>>
>> @@ -1384,21 +1384,13 @@ int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
>>
>> void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
>> {
>> - pud_t entry;
>> - unsigned long haddr;
>> bool write = vmf->flags & FAULT_FLAG_WRITE;
>>
>> vmf->ptl = pud_lock(vmf->vma->vm_mm, vmf->pud);
>> if (unlikely(!pud_same(*vmf->pud, orig_pud)))
>> goto unlock;
>>
>> - entry = pud_mkyoung(orig_pud);
>> - if (write)
>> - entry = pud_mkdirty(entry);
>> - haddr = vmf->address & HPAGE_PUD_MASK;
>> - if (pudp_set_access_flags(vmf->vma, haddr, vmf->pud, entry, write))
>> - update_mmu_cache_pud(vmf->vma, vmf->address, vmf->pud);
>> -
>> + touch_pud(vmf->vma, vmf->address, vmf->pud, write);
>> unlock:
>> spin_unlock(vmf->ptl);
>> }
>> --
>> 2.23.0
>>
>>
> .
>
