This patch provides a way to determine or "set a reasonable value for" MAX_PHYSMEM_BITS in the case that it is not defined (i.e. !SPARSEMEM)
Signed-off-by: Seth Jennings <[email protected]> --- drivers/staging/zsmalloc/zsmalloc_int.h | 14 ++++++++++++++ 1 files changed, 14 insertions(+), 0 deletions(-) diff --git a/drivers/staging/zsmalloc/zsmalloc_int.h b/drivers/staging/zsmalloc/zsmalloc_int.h index 4d66d2d..ffb272f 100644 --- a/drivers/staging/zsmalloc/zsmalloc_int.h +++ b/drivers/staging/zsmalloc/zsmalloc_int.h @@ -39,7 +39,21 @@ * Note that object index <obj_idx> is relative to system * page <PFN> it is stored in, so for each sub-page belonging * to a zspage, obj_idx starts with 0. + * + * This is made more complicated by various memory models and PAE. + */ + +#ifndef MAX_PHYSMEM_BITS +#ifdef CONFIG_HIGHMEM64G +#define MAX_PHYSMEM_BITS 36 +#else /* !CONFIG_HIGHMEM64G */ +/* + * If this definition of MAX_PHYSMEM_BITS is used, OBJ_INDEX_BITS will just + * be PAGE_SHIFT */ +#define MAX_PHYSMEM_BITS BITS_PER_LONG +#endif +#endif #define _PFN_BITS (MAX_PHYSMEM_BITS - PAGE_SHIFT) #define OBJ_INDEX_BITS (BITS_PER_LONG - _PFN_BITS) #define OBJ_INDEX_MASK ((_AC(1, UL) << OBJ_INDEX_BITS) - 1) -- 1.7.5.4 _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
