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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-07-18 17:17:22 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-07-22 13:38:58 +1000
commit50d2a4223bb875d1e3a7ee97d40dd03bf31ce1b7 (patch)
tree56f82f9e393067c45ad8151076d1a790dd7f7848 /arch/powerpc/kernel
parent5adfd346e48c7742bad179f9e959d15afbf5f95e (diff)
powerpc: Copy back TIF flags on return from softirq stack
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 <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/irq.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 346cc4a396f..d281fb6f12f 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)