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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