[PATCH] arch/powerpc/dax: Add MAP_SYNC mmap flag

Aneesh Kumar K.V aneesh.kumar at linux.ibm.com
Fri Mar 15 20:43:35 AEDT 2019

This enables support for synchronous DAX fault on powerpc

The generic changes are added as part of
commit b6fb293f2497 ("mm: Define MAP_SYNC and VM_SYNC flags")

Without this, mmap returns EOPNOTSUPP for MAP_SYNC with MAP_SHARED_VALIDATE

Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM regions")
Signed-off-by: Vaibhav Jain <vaibhav at linux.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
 arch/powerpc/include/uapi/asm/mman.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/include/uapi/asm/mman.h b/arch/powerpc/include/uapi/asm/mman.h
index 65065ce32814..e08cc5fc9d2f 100644
--- a/arch/powerpc/include/uapi/asm/mman.h
+++ b/arch/powerpc/include/uapi/asm/mman.h
@@ -29,6 +29,7 @@
 #define MAP_NONBLOCK	0x10000		/* do not block on IO */
 #define MAP_STACK	0x20000		/* give out an address that is best suited for process/thread stacks */
 #define MAP_HUGETLB	0x40000		/* create a huge page mapping */
+#define MAP_SYNC	0x80000		/* perform synchronous page faults for the mapping */
 /* Override any generic PKEY permission defines */

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