criu/arch/arm/include/asm/page.h

#ifndef __CR_ASM_PAGE_H__
#define __CR_ASM_PAGE_H__

#ifndef PAGE_SHIFT
# define PAGE_SHIFT	12
#endif

#ifndef PAGE_SIZE
# define PAGE_SIZE	(1UL << PAGE_SHIFT)
#endif

#ifndef PAGE_MASK
# define PAGE_MASK	(~(PAGE_SIZE - 1))
#endif

#define PAGE_PFN(addr)	((addr) / PAGE_SIZE)
#define page_size()	PAGE_SIZE

#endif /* __CR_ASM_PAGE_H__ */
Use run-time page size where it matters In AArch64, pages may be 4K or 64K depending on kernel configuration. The GNU C Library documentation suggests [1], "the correct interface to query about the page size is sysconf". Introduce one new architecture-specific function-like macro, page_size(), that on x86 and AArch32 remains a constant so as to minimally affect performance, but on AArch64 is sysconf(_SC_PAGESIZE) for correctness. 1. https://www.gnu.org/software/libc/manual/html_node/Query-Memory-Parameters.html To minimize churn, the PAGE_SIZE macro is left as a build-time estimation of what the run-time page size might be. This fixes the following errors for CRIU on AArch64 kernels with CONFIG_ARM64_64K_PAGES=y, allowing dump of `setsid sleep < /dev/null &> /dev/null` to succeed. Error (kerndat.c:48): Can't stat self map_files: No such file or directory Error (util.c:668): Can't read pme for pid 90: No such file or directory Error (parasite-syscall.c:1135): Can't open 89/map_files/0x3ffb7da0000-0x3ffb7dac000 on procfs: No such file or directory Signed-off-by: Christopher Covington <cov@codeaurora.org> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com> 2015-04-20 18:09:00 +03:00			`#ifndef __CR_ASM_PAGE_H__`
			`#define __CR_ASM_PAGE_H__`
asm-generic: Introduce page.h At the moment we are using 4K pages all the time, so instead of copying code over all archs we're supporting -- add asm-generic/page.h header. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com> 2014-02-20 18:36:00 +04:00
			`#ifndef PAGE_SHIFT`
			`# define PAGE_SHIFT 12`
			`#endif`

			`#ifndef PAGE_SIZE`
			`# define PAGE_SIZE (1UL << PAGE_SHIFT)`
			`#endif`

			`#ifndef PAGE_MASK`
			`# define PAGE_MASK (~(PAGE_SIZE - 1))`
			`#endif`

			`#define PAGE_PFN(addr) ((addr) / PAGE_SIZE)`
Use run-time page size where it matters In AArch64, pages may be 4K or 64K depending on kernel configuration. The GNU C Library documentation suggests [1], "the correct interface to query about the page size is sysconf". Introduce one new architecture-specific function-like macro, page_size(), that on x86 and AArch32 remains a constant so as to minimally affect performance, but on AArch64 is sysconf(_SC_PAGESIZE) for correctness. 1. https://www.gnu.org/software/libc/manual/html_node/Query-Memory-Parameters.html To minimize churn, the PAGE_SIZE macro is left as a build-time estimation of what the run-time page size might be. This fixes the following errors for CRIU on AArch64 kernels with CONFIG_ARM64_64K_PAGES=y, allowing dump of `setsid sleep < /dev/null &> /dev/null` to succeed. Error (kerndat.c:48): Can't stat self map_files: No such file or directory Error (util.c:668): Can't read pme for pid 90: No such file or directory Error (parasite-syscall.c:1135): Can't open 89/map_files/0x3ffb7da0000-0x3ffb7dac000 on procfs: No such file or directory Signed-off-by: Christopher Covington <cov@codeaurora.org> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com> 2015-04-20 18:09:00 +03:00			`#define page_size() PAGE_SIZE`
asm-generic: Introduce page.h At the moment we are using 4K pages all the time, so instead of copying code over all archs we're supporting -- add asm-generic/page.h header. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com> 2014-02-20 18:36:00 +04:00
Use run-time page size where it matters In AArch64, pages may be 4K or 64K depending on kernel configuration. The GNU C Library documentation suggests [1], "the correct interface to query about the page size is sysconf". Introduce one new architecture-specific function-like macro, page_size(), that on x86 and AArch32 remains a constant so as to minimally affect performance, but on AArch64 is sysconf(_SC_PAGESIZE) for correctness. 1. https://www.gnu.org/software/libc/manual/html_node/Query-Memory-Parameters.html To minimize churn, the PAGE_SIZE macro is left as a build-time estimation of what the run-time page size might be. This fixes the following errors for CRIU on AArch64 kernels with CONFIG_ARM64_64K_PAGES=y, allowing dump of `setsid sleep < /dev/null &> /dev/null` to succeed. Error (kerndat.c:48): Can't stat self map_files: No such file or directory Error (util.c:668): Can't read pme for pid 90: No such file or directory Error (parasite-syscall.c:1135): Can't open 89/map_files/0x3ffb7da0000-0x3ffb7dac000 on procfs: No such file or directory Signed-off-by: Christopher Covington <cov@codeaurora.org> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com> 2015-04-20 18:09:00 +03:00			`#endif /* __CR_ASM_PAGE_H__ */`