diff options
| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2024-10-14 17:13:39 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-10-16 00:13:04 +0200 |
| commit | efe8419ae78d65e83edc31aad74b605c12e7d60c (patch) | |
| tree | e74506defd767337e971685bf2cc2a0c6a0c59b1 /include/vdso | |
| parent | drm: i915: Change fault type to unsigned long (diff) | |
| download | linux-efe8419ae78d65e83edc31aad74b605c12e7d60c.tar.xz linux-efe8419ae78d65e83edc31aad74b605c12e7d60c.zip | |
vdso: Introduce vdso/page.h
The VDSO implementation includes headers from outside of the
vdso/ namespace.
Introduce vdso/page.h to make sure that the generic library
uses only the allowed namespace.
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k
Link: https://lore.kernel.org/all/20241014151340.1639555-3-vincenzo.frascino@arm.com
Diffstat (limited to 'include/vdso')
| -rw-r--r-- | include/vdso/page.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/vdso/page.h b/include/vdso/page.h new file mode 100644 index 000000000000..4ada1ba6bd1f --- /dev/null +++ b/include/vdso/page.h @@ -0,0 +1,30 @@ +/* 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_PHYS_ADDR_T_64BIT) && !defined(CONFIG_64BIT) +/* + * Applies only to 32-bit architectures with a 64-bit phys_addr_t. + * + * 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) + */ +#define PAGE_MASK (~((1 << CONFIG_PAGE_SHIFT) - 1)) +#else +#define PAGE_MASK (~(PAGE_SIZE - 1)) +#endif + +#endif /* __VDSO_PAGE_H */ |