We already did it for hard IRQs but it looks like we forgot to do it for softirqs. Without this, we would lose flags such as TIF_NEED_RESCHED set using current_thread_info() by something running of a softirq.
Signed-off-by: Benjamin Herrenschmidt <[email protected]> --- arch/powerpc/kernel/irq.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 164fb6c..4e7f1aa 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -451,11 +451,18 @@ static inline void do_softirq_onstack(void) curtp = current_thread_info(); irqtp = softirq_ctx[smp_processor_id()]; irqtp->task = curtp->task; + irqtp->flags = 0; current->thread.ksp_limit = (unsigned long)irqtp + _ALIGN_UP(sizeof(struct thread_info), 16); call_do_softirq(irqtp); current->thread.ksp_limit = saved_sp_limit; irqtp->task = NULL; + + /* Set any flag that may have been set on the + * alternate stack + */ + if (irqtp->flags) + set_bits(irqtp->flags, &curtp->flags); } void do_softirq(void) _______________________________________________ Linuxppc-dev mailing list [email protected] https://lists.ozlabs.org/listinfo/linuxppc-dev
