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| author | Jan Kara <jack@suse.cz> | 2017-11-01 16:36:41 +0100 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-11-03 06:26:25 -0700 |
| commit | b6fb293f2497a9841d94f6b57bd2bb2cd222da43 (patch) | |
| tree | 9ca796e1c964fbed568e7aa68dde7c3819fa344c /include/linux/mman.h | |
| parent | f5b7b74876cff5664ea8b2ef7f002c54cd6e7c90 (diff) | |
| download | lwn-b6fb293f2497a9841d94f6b57bd2bb2cd222da43.tar.gz lwn-b6fb293f2497a9841d94f6b57bd2bb2cd222da43.zip | |
mm: Define MAP_SYNC and VM_SYNC flags
Define new MAP_SYNC flag and corresponding VMA VM_SYNC flag. As the
MAP_SYNC flag is not part of LEGACY_MAP_MASK, currently it will be
refused by all MAP_SHARED_VALIDATE map attempts and silently ignored for
everything else.
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/mman.h')
| -rw-r--r-- | include/linux/mman.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/mman.h b/include/linux/mman.h index 74452e3f2536..3427bf3daef5 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -9,7 +9,7 @@ /* * Arrange for legacy / undefined architecture specific flags to be - * ignored by default in LEGACY_MAP_MASK. + * ignored by mmap handling code. */ #ifndef MAP_32BIT #define MAP_32BIT 0 @@ -23,6 +23,9 @@ #ifndef MAP_UNINITIALIZED #define MAP_UNINITIALIZED 0 #endif +#ifndef MAP_SYNC +#define MAP_SYNC 0 +#endif /* * The historical set of flags that all mmap implementations implicitly @@ -126,7 +129,8 @@ calc_vm_flag_bits(unsigned long flags) { return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | - _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ); + _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ) | + _calc_vm_trans(flags, MAP_SYNC, VM_SYNC ); } unsigned long vm_commit_limit(void); |