On Thursday 10 September 2009, Sukadev Bhattiprolu wrote: > Since this is a variant of clone() and clone is listed as a PTREGSCALL(), > I pass in the pt_regs. > > arch/x86/kernel/entry_32.S lists clone() under this comment: > > /* > * System calls that need a pt_regs pointer. > */ > > Is there a guideline on what system calls use/need pt_regs ? You need pt_regs if you access any registers from the user task other than the argument registers. In case of clone(), this is the user stack pointer. The user_stack_pointer() function is relatively new, before this you couldn't get the stack pointer out of pt_regs in a generic way. Arnd <>< _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
