Messages in this thread | | | Subject | Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation | From | Roland Dreier <> | Date | Wed, 13 Apr 2005 11:28:03 -0700 |
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OK, I'm by no means an expert on this, but Libor and I looked at rmap.c a little more, and there is code:
if ((vma->vm_flags & (VM_LOCKED|VM_RESERVED)) || ptep_clear_flush_young(vma, address, pte)) { ret = SWAP_FAIL; goto out_unmap; }
before the check
if (PageSwapCache(page) && page_count(page) != page_mapcount(page) + 2) { ret = SWAP_FAIL; goto out_unmap; }
If userspace allocates some memory but doesn't touch it aside from passing the address in to the kernel, which does get_user_pages(), the PTE will be young in that first test, right? Does that mean that the userspace mapping will be cleared and userspace will get a different physical page if it faults that address back in?
- R.
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