include/asm/pgalloc.h

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
6  *  -"/proc/meminfo | grep PageTables" kept on increasing
10  *  -Variable pg-sz means that Page Tables could be variable sized themselves
11  *    So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx]
12  *  -Page Table size capped to max 1 to save memory - hence verified.
13  *  -Since these deal with constants, gcc compile-time optimizes them.
16  *  -Added pgtable ctor/dtor used for pgtable mem accounting
19  *  -Switched pgtable_t from being struct page * to unsigned long
24  *       pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate)
34 #include <asm-generic/pgalloc.h>
40 	 * The cast to long below is OK in 32-bit PAE40 regime with long long pte  in pmd_populate_kernel()
41 	 * Despite "wider" pte, the pte table needs to be in non-PAE low memory  in pmd_populate_kernel()
67 			       (PTRS_PER_PGD - num - num2) * sizeof(pgd_t));  in pgd_alloc()
80 #define __pud_free_tlb(tlb, pmd, addr)  pud_free((tlb)->mm, pmd)  argument
91 #define __pmd_free_tlb(tlb, pmd, addr)  pmd_free((tlb)->mm, pmd)  argument
95 #define __pte_free_tlb(tlb, pte, addr)  pte_free((tlb)->mm, pte)  argument