On Tue 28-05-19 14:41:20, Aneesh Kumar K.V wrote:
> 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
>
> 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.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
Looks good to me FWIW (I don't have much experience with mmap flags and
their peculirarities). So feel free to add:
Reviewed-by: Jan Kara <j...@suse.cz>
Honza
> ---
> Changes from V1:
> * Move #define to mman-common.h instead of powerpc specific mman.h change
>
>
> include/uapi/asm-generic/mman-common.h | 3 ++-
> include/uapi/asm-generic/mman.h | 1 -
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/uapi/asm-generic/mman-common.h
> b/include/uapi/asm-generic/mman-common.h
> index abd238d0f7a4..bea0278f65ab 100644
> --- a/include/uapi/asm-generic/mman-common.h
> +++ b/include/uapi/asm-generic/mman-common.h
> @@ -25,7 +25,8 @@
> # define MAP_UNINITIALIZED 0x0 /* Don't support this flag */
> #endif
>
> -/* 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 */
>
> /*
> diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h
> index 653687d9771b..2dffcbf705b3 100644
> --- a/include/uapi/asm-generic/mman.h
> +++ b/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 */
>
> --
> 2.21.0
>
--
Jan Kara <j...@suse.com>
SUSE Labs, CR
