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FROMLIST: mm: implement speculative handling in do_numa_page()

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change do_numa_page() to use pte_spinlock() when locking the page table,
so that the mmap sequence counter will be validated in the speculative case.

Signed-off-by: Michel Lespinasse <michel@lespinasse.org>
Link: https://lore.kernel.org/all/20220128131006.67712-21-michel@lespinasse.org/
Bug: 161210518
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: If252547faf2a8a6cbba4c0a7ff929071a5f6a657
This commit is contained in:
Michel Lespinasse
2022-01-24 17:43:55 -08:00
committed by Todd Kjos
parent c2b2abe724
commit fedc4d513e
1 changed files with 2 additions and 2 deletions
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4
mm/memory.c
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@@ -4443,8 +4443,8 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
* validation through pte_unmap_same(). It's of NUMA type but
* the pfn may be screwed if the read is non atomic.
*/
vmf->ptl = pte_lockptr(vma->vm_mm, vmf->pmd);
spin_lock(vmf->ptl);
if (!pte_spinlock(vmf))
return VM_FAULT_RETRY;
if (unlikely(!pte_same(*vmf->pte, vmf->orig_pte))) {
pte_unmap_unlock(vmf->pte, vmf->ptl);
goto out;