Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6e00ec00 authored by Seth Jennings's avatar Seth Jennings Committed by Greg Kroah-Hartman
Browse files

staging: zsmalloc: calculate MAX_PHYSMEM_BITS if not defined 



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: default avatarSeth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: default avatarNitin Gupta <ngupta@vflare.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 84d4faab

drivers/staging/zsmalloc/zsmalloc_int.h

+14 −0
Original line number Diff line number Diff line
@@ -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)