Merge tag 'v4.8-rc8' into drm-next

Linux 4.8-rc8

There was a lot of fallout in the imx/amdgpu/i915 drivers, so backmerge
it now to avoid troubles.

* tag 'v4.8-rc8': (1442 commits)
  Linux 4.8-rc8
  fault_in_multipages_readable() throws set-but-unused error
  mm: check VMA flags to avoid invalid PROT_NONE NUMA balancing
  radix tree: fix sibling entry handling in radix_tree_descend()
  radix tree test suite: Test radix_tree_replace_slot() for multiorder entries
  fix memory leaks in tracing_buffers_splice_read()
  tracing: Move mutex to protect against resetting of seq data
  MIPS: Fix delay slot emulation count in debugfs
  MIPS: SMP: Fix possibility of deadlock when bringing CPUs online
  mm: delete unnecessary and unsafe init_tlb_ubc()
  huge tmpfs: fix Committed_AS leak
  shmem: fix tmpfs to handle the huge= option properly
  blk-mq: skip unmapped queues in blk_mq_alloc_request_hctx
  MIPS: Fix pre-r6 emulation FPU initialisation
  arm64: kgdb: handle read-only text / modules
  arm64: Call numa_store_cpu_info() earlier.
  locking/hung_task: Fix typo in CONFIG_DETECT_HUNG_TASK help text
  nvme-rdma: only clear queue flags after successful connect
  i2c: qup: skip qup_i2c_suspend if the device is already runtime suspended
  perf/core: Limit matching exclusive events to one PMU
  ...

1 files changed, 7 insertions, 5 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 83be99d9d8a1..793fe0f9841c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3351,9 +3351,6 @@ static int do_numa_page(struct fault_env *fe, pte_t pte)
 	bool was_writable = pte_write(pte);
 	int flags = 0;
 
-	/* A PROT_NONE fault should not end up here */
-	BUG_ON(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)));
-
 	/*
 	* The "pte" at this point cannot be used safely without
 	* validation through pte_unmap_same(). It's of NUMA type but
@@ -3458,6 +3455,11 @@ static int wp_huge_pmd(struct fault_env *fe, pmd_t orig_pmd)
 	return VM_FAULT_FALLBACK;
 }
 
+static inline bool vma_is_accessible(struct vm_area_struct *vma)
+{
+	return vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE);
+}
+
 /*
  * These routines also need to handle stuff like marking pages dirty
  * and/or accessed for architectures that don't do it in hardware (most
@@ -3524,7 +3526,7 @@ static int handle_pte_fault(struct fault_env *fe)
 	if (!pte_present(entry))
 		return do_swap_page(fe, entry);
 
-	if (pte_protnone(entry))
+	if (pte_protnone(entry) && vma_is_accessible(fe->vma))
 		return do_numa_page(fe, entry);
 
 	fe->ptl = pte_lockptr(fe->vma->vm_mm, fe->pmd);
@@ -3590,7 +3592,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
 
 		barrier();
 		if (pmd_trans_huge(orig_pmd) || pmd_devmap(orig_pmd)) {
-			if (pmd_protnone(orig_pmd))
+			if (pmd_protnone(orig_pmd) && vma_is_accessible(vma))
 				return do_huge_pmd_numa_page(&fe, orig_pmd);
 
 			if ((fe.flags & FAULT_FLAG_WRITE) &&