From: Martin Schwidefsky <schwidefsky@de.ibm.com>

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Introduce a TIF_SINGLE_STEP bit that causes do_debugger_trap to get called
at the end of a system call.  This way some code duplication in the program
check handler can get removed.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>