include/linux/pgalloc.h

Source file repositories/reference/linux-study-clean/include/linux/pgalloc.h

File Facts

System
Linux kernel
Corpus path
include/linux/pgalloc.h
Extension
.h
Size
948 bytes
Lines
30
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _LINUX_PGALLOC_H
#define _LINUX_PGALLOC_H

#include <linux/pgtable.h>
#include <asm/pgalloc.h>

/*
 * {pgd,p4d}_populate_kernel() are defined as macros to allow
 * compile-time optimization based on the configured page table levels.
 * Without this, linking may fail because callers (e.g., KASAN) may rely
 * on calls to these functions being optimized away when passing symbols
 * that exist only for certain page table levels.
 */
#define pgd_populate_kernel(addr, pgd, p4d)				\
	do {								\
		pgd_populate(&init_mm, pgd, p4d);			\
		if (ARCH_PAGE_TABLE_SYNC_MASK & PGTBL_PGD_MODIFIED)	\
			arch_sync_kernel_mappings(addr, addr);		\
	} while (0)

#define p4d_populate_kernel(addr, p4d, pud)				\
	do {								\
		p4d_populate(&init_mm, p4d, pud);			\
		if (ARCH_PAGE_TABLE_SYNC_MASK & PGTBL_P4D_MODIFIED)	\
			arch_sync_kernel_mappings(addr, addr);		\
	} while (0)

#endif /* _LINUX_PGALLOC_H */

Annotation

Implementation Notes