kernel/arch/s390/include/asm/softirq_stack.h, branch linux-6.2.y

asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig.

2022-09-05T15:20:55Z

Remove the CONFIG_PREEMPT_RT symbol from the ifdef around do_softirq_own_stack() and move it to Kconfig instead. Enable softirq stacks based on SOFTIRQ_ON_OWN_STACK which depends on HAVE_SOFTIRQ_ON_OWN_STACK and its default value is set to !PREEMPT_RT. This ensures that softirq stacks are not used on PREEMPT_RT and avoids a 'select' statement on an option which has a 'depends' statement. Link: https://lore.kernel.org/YvN5E%2FPrHfUhggr7@linutronix.de Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Arnd Bergmann

arch/*: Disable softirq stacks on PREEMPT_RT.

2022-06-15T15:40:59Z

PREEMPT_RT preempts softirqs and the current implementation avoids do_softirq_own_stack() and only uses __do_softirq(). Disable the unused softirqs stacks on PREEMPT_RT to save some memory and ensure that do_softirq_own_stack() is not used bwcause it is not expected. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Arnd Bergmann

s390/softirq: use call_on_stack() macro

2021-07-08T20:12:18Z

Reviewed-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/irq: inline do_softirq_own_stack()

2021-07-08T20:12:17Z

Move do_softirq_own_stack() to proper header file so it can be inlined; saving a few cycles. Reviewed-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik