Cregit: Linux 6.12: pfn.h

Contributors: 7
Author	Tokens	Token Proportion	Commits	Commit Proportion
Hirokazu Takata	20	32.26%	1	12.50%
Dan J Williams	10	16.13%	2	25.00%
Jeremy Fitzhardinge	9	14.52%	1	12.50%
Dave Hansen	8	12.90%	1	12.50%
Ralf Baechle	7	11.29%	1	12.50%
Chen Gang S	7	11.29%	1	12.50%
Greg Kroah-Hartman	1	1.61%	1	12.50%
Total	62		8

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PFN_H_
#define _LINUX_PFN_H_

#ifndef __ASSEMBLY__
#include <linux/types.h>

/*
 * pfn_t: encapsulates a page-frame number that is optionally backed
 * by memmap (struct page).  Whether a pfn_t has a 'struct page'
 * backing is indicated by flags in the high bits of the value.
 */
typedef struct {
	u64 val;
} pfn_t;
#endif

#define PFN_ALIGN(x)	(((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
#define PFN_PHYS(x)	((phys_addr_t)(x) << PAGE_SHIFT)
#define PHYS_PFN(x)	((unsigned long)((x) >> PAGE_SHIFT))

#endif