Linus Torvalds writes: (Summary)
What _does_ show up a bit is this in prepare_exit_to_usermode():
What _does_ show up a bit is this in prepare_exit_to_usermode():
#ifdef CONFIG_COMPAT
/*
* Compat syscalls set TS_COMPAT. We need to clear it *after* signal
* handling, because syscall restart has a fixup for compat
* syscalls.
*
* We also need to clear TS_REGS_POKED_I386: the 32-bit tracer
* special case only applies after poking regs and before the
* very next return to user mode.