Cregit: Linux 6.13: page.h

Contributors: 11
Author	Tokens	Token Proportion	Commits	Commit Proportion
Vincenzo Frascino	15	35.71%	1	8.33%
Chris Zankel	6	14.29%	1	8.33%
Jeff Dike	4	9.52%	1	8.33%
Ley Foon Tan	4	9.52%	1	8.33%
Michael Ellerman	3	7.14%	1	8.33%
Cyrill V. Gorcunov	2	4.76%	1	8.33%
Andrew Lutomirski	2	4.76%	1	8.33%
Jeremy Fitzhardinge	2	4.76%	1	8.33%
Arnd Bergmann	2	4.76%	2	16.67%
Greg Kroah-Hartman	1	2.38%	1	8.33%
Paolo 'Blaisorblade' Giarrusso	1	2.38%	1	8.33%
Total	42		12

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

#include <uapi/linux/const.h>

/*
 * PAGE_SHIFT determines the page size.
 *
 * Note: This definition is required because PAGE_SHIFT is used
 * in several places throuout the codebase.
 */
#define PAGE_SHIFT      CONFIG_PAGE_SHIFT

#define PAGE_SIZE	(_AC(1,UL) << CONFIG_PAGE_SHIFT)

#if !defined(CONFIG_64BIT)
/*
 * Applies only to 32-bit architectures.
 *
 * Subtle: (1 << CONFIG_PAGE_SHIFT) is an int, not an unsigned long.
 * So if we assign PAGE_MASK to a larger type it gets extended the
 * way we want (i.e. with 1s in the high bits) while masking a
 * 64-bit value such as phys_addr_t.
 */
#define PAGE_MASK	(~((1 << CONFIG_PAGE_SHIFT) - 1))
#else
#define PAGE_MASK	(~(PAGE_SIZE - 1))
#endif

#endif	/* __VDSO_PAGE_H */