2011/8/23 Andrew Morton [off-list ref]:

This seems more complicated than is needed.  Couldn't we just do

static void poison_page(struct page *page)
{
       void *addr;

       preempt_disable();
       addr = kmap_atomic(page);
       set_page_poison(page);
       memset(addr, PAGE_POISON, PAGE_SIZE);
       kunmap_atomic(addr);
       preempt_enable();
}

?

This code looks much better.  I'll update the patch.

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