* [PATCH] arch/powerpc/dax: Add MAP_SYNC mmap flag
@ 2019-03-15 9:43 Aneesh Kumar K.V
0 siblings, 0 replies; only message in thread
From: Aneesh Kumar K.V @ 2019-03-15 9:43 UTC (permalink / raw)
To: npiggin, benh, paulus, mpe, Oliver O'Halloran
Cc: Aneesh Kumar K.V, linuxppc-dev, Vaibhav Jain
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@linux.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@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 */
#define PKEY_DISABLE_EXECUTE 0x4
--
2.20.1
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