powerpc/irq: fix stack overflow verification
commit 099bc4812f09155da77eeb960a983470249c9ce1 upstream. Before commit0366a1c70b
("powerpc/irq: Run softirqs off the top of the irq stack"), check_stack_overflow() was called by do_IRQ(), before switching to the irq stack. In that commit, do_IRQ() was renamed __do_irq(), and is now executing on the irq stack, so check_stack_overflow() has just become almost useless. Move check_stack_overflow() call in do_IRQ() to do the check while still on the current stack. Fixes:0366a1c70b
("powerpc/irq: Run softirqs off the top of the irq stack") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/e033aa8116ab12b7ca9a9c75189ad0741e3b9b5f.1575872340.git.christophe.leroy@c-s.fr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 2 additions and 2 deletions
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@ -634,8 +634,6 @@ void __do_irq(struct pt_regs *regs)
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trace_irq_entry(regs);
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trace_irq_entry(regs);
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check_stack_overflow();
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/*
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/*
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* Query the platform PIC for the interrupt & ack it.
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* Query the platform PIC for the interrupt & ack it.
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*
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*
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@ -667,6 +665,8 @@ void do_IRQ(struct pt_regs *regs)
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irqtp = hardirq_ctx[raw_smp_processor_id()];
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irqtp = hardirq_ctx[raw_smp_processor_id()];
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sirqtp = softirq_ctx[raw_smp_processor_id()];
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sirqtp = softirq_ctx[raw_smp_processor_id()];
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check_stack_overflow();
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/* Already there ? */
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/* Already there ? */
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if (unlikely(curtp == irqtp || curtp == sirqtp)) {
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if (unlikely(curtp == irqtp || curtp == sirqtp)) {
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__do_irq(regs);
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__do_irq(regs);
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