Commit 22fcea6f authored Jul 16, 2019 by Aneesh Kumar K.V Committed by Linus Torvalds Jul 16, 2019

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 b6fb293f ("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@linux.ibm.com


Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 9f960da7

include/uapi/asm-generic/mman-common.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -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

include/uapi/asm-generic/mman.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -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 */

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