On the s390 architecture virtual kernel and user address spaces are never present at the same time, so how does copy_to_user work?
How does copy_to_user work on s390?
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copy_to_userfor s390 is implemented here: linux/arch/s390/include/asm/uaceess.h.uaccessis the pointer to copy_[to/from]_user actual implementation. It is setted up here (grep uaccess): arch/s390/kernel/setup.c. There are 4 implementations ofuaccess, depening from mode:uaccess_mvcos_switch,uaccess_pt,uaccess_mvcosanduaccess_stdFor example uaccess_std is here: http://lxr.linux.no/#linux+v3.2.1/arch/s390/lib/uaccess_std.c
...
The
mvcp/mvcsmechanism is used: http://publib.boulder.ibm.com/infocenter/zos/v1r11/topic/com.ibm.zos.r11.ieaa500/iea2a57031.htm