Argh. Did not see this soon enougn. Maybe this one is better since it
avoids the additional unlocks?
On Fri, 1 Feb 2008, Robin Holt wrote:
> do_wp_page can reach the _end callout without passing the _begin
> callout. This prevents making the _end unles the _begin has also
> been made.
>
> Index: mmu_notifiers-cl-v5/mm/memory.c
> ===================================================================
> --- mmu_notifiers-cl-v5.orig/mm/memory.c 2008-02-01 04:44:03.000000000
> -0600
> +++ mmu_notifiers-cl-v5/mm/memory.c 2008-02-01 04:46:18.000000000 -0600
> @@ -1564,7 +1564,7 @@ static int do_wp_page(struct mm_struct *
> {
> struct page *old_page, *new_page;
> pte_t entry;
> - int reuse = 0, ret = 0;
> + int reuse = 0, ret = 0, invalidate_started = 0;
> int page_mkwrite = 0;
> struct page *dirty_page = NULL;
>
> @@ -1649,6 +1649,8 @@ gotten:
>
> mmu_notifier(invalidate_range_begin, mm, address,
> address + PAGE_SIZE, 0);
> + invalidate_started = 1;
> +
> /*
> * Re-check the pte - we dropped the lock
> */
> @@ -1687,7 +1689,8 @@ gotten:
> page_cache_release(old_page);
> unlock:
> pte_unmap_unlock(page_table, ptl);
> - mmu_notifier(invalidate_range_end, mm,
> + if (invalidate_started)
> + mmu_notifier(invalidate_range_end, mm,
> address, address + PAGE_SIZE, 0);
> if (dirty_page) {
> if (vma->vm_file)
>
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