Vasily Gorbik a04223019c s390: avoid misusing CALL_ON_STACK for task stack setup ... [ Upstream commit 7bcaad1f9f ] CALL_ON_STACK is intended to be used for temporary stack switching with potential return to the caller. When CALL_ON_STACK is misused to switch from nodat stack to task stack back_chain information would later lead stack unwinder from task stack into (per cpu) nodat stack which is reused for other purposes. This would yield confusing unwinding result or errors. To avoid that introduce CALL_ON_STACK_NORETURN to be used instead. It makes sure that back_chain is zeroed and unwinder finishes gracefully ending up at task pt_regs. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-10-01 13:17:22 +02:00
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asm	s390: avoid misusing CALL_ON_STACK for task stack setup	2020-10-01 13:17:22 +02:00
uapi/asm	s390 updates for the 5.4 merge window #2	2019-09-26 11:30:16 -07:00