linux.git/arch/s390/include/asm/stacktrace.h, branch v5.3.2 Clone of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git s390/unwind: correct stack switching during unwind 2019-06-07T13:20:44+00:00 Vasily Gorbik gor@linux.ibm.com 2019-06-06T14:58:45+00:00 0ab0d7ac2090eae30f1c0b01ae981bb7a368f598 Adjust conditions in on_stack function. That fixes backchain unwinder which was unable to read pt_regs at the very bottom of the stack and hence couldn't follow stacks (e.g. from async stack to a task stack). Fixes: 78c98f907413 ("s390/unwind: introduce stack unwind API") Reported-by: Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> 
Adjust conditions in on_stack function. That fixes backchain unwinder
which was unable to read pt_regs at the very bottom of the stack and
hence couldn't follow stacks (e.g. from async stack to a task stack).

Fixes: 78c98f907413 ("s390/unwind: introduce stack unwind API")
Reported-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
s390/unwind: introduce stack unwind API 2019-05-02T11:54:11+00:00 Martin Schwidefsky schwidefsky@de.ibm.com 2019-01-28T07:33:08+00:00 78c98f9074135d3dab4e39544e0a537f92388fce Rework the dump_trace() stack unwinder interface to support different unwinding algorithms. The new interface looks like this: struct unwind_state state; unwind_for_each_frame(&state, task, regs, start_stack) do_something(state.sp, state.ip, state.reliable); The unwind_bc.c file contains the implementation for the classic back-chain unwinder. One positive side effect of the new code is it now handles ftraced functions gracefully. It prints the real name of the return function instead of 'return_to_handler'. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 
Rework the dump_trace() stack unwinder interface to support different
unwinding algorithms. The new interface looks like this:

	struct unwind_state state;
	unwind_for_each_frame(&state, task, regs, start_stack)
		do_something(state.sp, state.ip, state.reliable);

The unwind_bc.c file contains the implementation for the classic
back-chain unwinder.

One positive side effect of the new code is it now handles ftraced
functions gracefully. It prints the real name of the return function
instead of 'return_to_handler'.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>