pgalloc.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _LINUX_PGALLOC_H
 3#define _LINUX_PGALLOC_H
 4
 5#include <linux/pgtable.h>
 6#include <asm/pgalloc.h>
 7
 8/*
 9 * {pgd,p4d}_populate_kernel() are defined as macros to allow
10 * compile-time optimization based on the configured page table levels.
11 * Without this, linking may fail because callers (e.g., KASAN) may rely
12 * on calls to these functions being optimized away when passing symbols
13 * that exist only for certain page table levels.
14 */
15#define pgd_populate_kernel(addr, pgd, p4d)				\
16	do {								\
17		pgd_populate(&init_mm, pgd, p4d);			\
18		if (ARCH_PAGE_TABLE_SYNC_MASK & PGTBL_PGD_MODIFIED)	\
19			arch_sync_kernel_mappings(addr, addr);		\
20	} while (0)
21
22#define p4d_populate_kernel(addr, p4d, pud)				\
23	do {								\
24		p4d_populate(&init_mm, p4d, pud);			\
25		if (ARCH_PAGE_TABLE_SYNC_MASK & PGTBL_P4D_MODIFIED)	\
26			arch_sync_kernel_mappings(addr, addr);		\
27	} while (0)
28
29#endif /* _LINUX_PGALLOC_H */