From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Subject: mm: move MAP_SYNC to asm-generic/mman-common.h
This enables support for synchronous DAX fault on powerpc
The generic changes are added as part of b6fb293f2497 ("mm: Define
MAP_SYNC and VM_SYNC flags")
Without this, mmap returns EOPNOTSUPP for MAP_SYNC with
MAP_SHARED_VALIDATE
Instead of adding MAP_SYNC with same value to
arch/powerpc/include/uapi/asm/mman.h, I am moving the #define to
asm-generic/mman-common.h. Two architectures using mman-common.h directly
are sparc and powerpc. We should be able to consloidate more #defines to
mman-common.h. That can be done as a separate patch.
Link: http://lkml.kernel.org/r/20190528091120.13322-1-aneesh.kumar@xxxxxxxxxxxxx
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/uapi/asm-generic/mman-common.h | 3 ++-
include/uapi/asm-generic/mman.h | 1 -
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/include/uapi/asm-generic/mman-common.h~mm-move-map_sync-to-asm-generic-mman-commonh
+++ a/include/uapi/asm-generic/mman-common.h
@@ -20,7 +20,8 @@
#define MAP_FIXED 0x10 /* Interpret addr exactly */
#define MAP_ANONYMOUS 0x20 /* don't use a file */
-/* 0x0100 - 0x80000 flags are defined in asm-generic/mman.h */
+/* 0x0100 - 0x40000 flags are defined in asm-generic/mman.h */
+#define MAP_SYNC 0x080000 /* perform synchronous page faults for the mapping */
#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */
#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be
--- a/include/uapi/asm-generic/mman.h~mm-move-map_sync-to-asm-generic-mman-commonh
+++ a/include/uapi/asm-generic/mman.h
@@ -13,7 +13,6 @@
#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 */
/* Bits [26:31] are reserved, see mman-common.h for MAP_HUGETLB usage */
_
