David Vrabel e3a1f6cac1 x86: pte_protnone() and pmd_protnone() must check entry is not present ... Since _PAGE_PROTNONE aliases _PAGE_GLOBAL it is only valid if _PAGE_PRESENT is clear. Make pte_protnone() and pmd_protnone() check for this. This fixes a 64-bit Xen PV guest regression introduced by 8a0516ed8b ("mm: convert p[te|md]_numa users to p[te|md]_protnone_numa"). Any userspace process would endlessly fault. In a 64-bit PV guest, userspace page table entries have _PAGE_GLOBAL set by the hypervisor. This meant that any fault on a present userspace entry (e.g., a write to a read-only mapping) would be misinterpreted as a NUMA hinting fault and the fault would not be correctly handled, resulting in the access endlessly faulting. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2015-02-19 15:04:49 -08:00
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asm	x86: pte_protnone() and pmd_protnone() must check entry is not present	2015-02-19 15:04:49 -08:00
uapi/asm	Char / Misc patches for 3.20-rc1	2015-02-15 10:48:44 -08:00