Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / arch / x86 / include / asm / sparsemem.h
blob4fc1e9d3c43e78477d3144364eeedb4e6cb93d33
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_SPARSEMEM_H
3 #define _ASM_X86_SPARSEMEM_H
5 #ifdef CONFIG_SPARSEMEM
6 /*
7 * generic non-linear memory support:
9 * 1) we will not split memory into more chunks than will fit into the flags
10 * field of the struct page
12 * SECTION_SIZE_BITS 2^n: size of each section
13 * MAX_PHYSADDR_BITS 2^n: max size of physical address space
14 * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space
18 #ifdef CONFIG_X86_32
19 # ifdef CONFIG_X86_PAE
20 # define SECTION_SIZE_BITS 29
21 # define MAX_PHYSADDR_BITS 36
22 # define MAX_PHYSMEM_BITS 36
23 # else
24 # define SECTION_SIZE_BITS 26
25 # define MAX_PHYSADDR_BITS 32
26 # define MAX_PHYSMEM_BITS 32
27 # endif
28 #else /* CONFIG_X86_32 */
29 # define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */
30 # ifdef CONFIG_X86_5LEVEL
31 # define MAX_PHYSADDR_BITS 52
32 # define MAX_PHYSMEM_BITS 52
33 # else
34 # define MAX_PHYSADDR_BITS 44
35 # define MAX_PHYSMEM_BITS 46
36 # endif
37 #endif
39 #endif /* CONFIG_SPARSEMEM */
40 #endif /* _ASM_X86_SPARSEMEM_H */