diff options
Diffstat (limited to 'drivers/staging/zsmalloc/zsmalloc.h')
| -rw-r--r-- | drivers/staging/zsmalloc/zsmalloc.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/staging/zsmalloc/zsmalloc.h b/drivers/staging/zsmalloc/zsmalloc.h index fbe6bec421a..c2eb174b97e 100644 --- a/drivers/staging/zsmalloc/zsmalloc.h +++ b/drivers/staging/zsmalloc/zsmalloc.h @@ -18,12 +18,19 @@ /* * zsmalloc mapping modes * - * NOTE: These only make a difference when a mapped object spans pages + * NOTE: These only make a difference when a mapped object spans pages. + * They also have no effect when PGTABLE_MAPPING is selected. */ enum zs_mapmode { ZS_MM_RW, /* normal read-write mapping */ ZS_MM_RO, /* read-only (no copy-out at unmap time) */ ZS_MM_WO /* write-only (no copy-in at map time) */ + /* + * NOTE: ZS_MM_WO should only be used for initializing new + * (uninitialized) allocations. Partial writes to already + * initialized allocations should use ZS_MM_RW to preserve the + * existing data. + */ }; struct zs_pool; |