Re: [RFC v4 09/17] powerpc: call the hash functions with the correct pkey value

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On Tuesday 27 June 2017 03:41 PM, Ram Pai wrote:
Pass the correct protection key value to the hash functions on
page fault.

Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
---
  arch/powerpc/include/asm/pkeys.h | 11 +++++++++++
  arch/powerpc/mm/hash_utils_64.c  |  4 ++++
  arch/powerpc/mm/mem.c            |  6 ++++++
  3 files changed, 21 insertions(+)

diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index ef1c601..1370b3f 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -74,6 +74,17 @@ static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
  }

  /*
+ * return the protection key of the vma corresponding to the
+ * given effective address @ea.
+ */
+static inline int mm_pkey(struct mm_struct *mm, unsigned long ea)
+{
+	struct vm_area_struct *vma = find_vma(mm, ea);
+	int pkey = vma ? vma_pkey(vma) : 0;
+	return pkey;
+}
+
+/*


That is not going to work in hash fault path right ? We can't do a find_vma there without holding the mmap_sem

-aneesh

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