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Re: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages

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On Wed, Jun 21, 2017 at 02:12:27AM +0000, Naoya Horiguchi wrote:

> We had better have a reverse operation of this to cancel the unmapping
> when unpoisoning?

When we have unpoisoning, we can add something.  We don't seem to have
an inverse function for "set_memory_np" to just flip the _PRESENT bit
back on again. But it would be trivial to write a set_memory_pp().

Since we'd be doing this after the poison has been cleared, we wouldn't
need to play games with the address.  We'd just use:

	set_memory_pp((unsigned long)pfn_to_kaddr(pfn), 1);

-Tony

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Re: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings  of poison pages Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2017-06-21 04:20 +0200
  Re: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings  of poison pages "Luck, Tony" <tony.luck@intel.com> - 2017-06-21 20:00 +0200
    RE: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of  poison pages "Elliott, Robert (Persistent Memory)" <elliott@hpe.com> - 2017-06-21 21:50 +0200
      RE: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings  of poison pages "Luck, Tony" <tony.luck@intel.com> - 2017-06-21 22:40 +0200
        Re: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of  poison pages Dan Williams <dan.j.williams@intel.com> - 2017-06-23 07:10 +0200
          Re: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings  of poison pages "Luck, Tony" <tony.luck@intel.com> - 2017-06-23 23:00 +0200

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