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Re: [next-20170217] WARN @/arch/powerpc/include/asm/xics.h:124 .icp_hv_eoi+0x40/0x140

From Benjamin Herrenschmidt <benh@au1.ibm.com>
Newsgroups linux.kernel
Subject Re: [next-20170217] WARN @/arch/powerpc/include/asm/xics.h:124 .icp_hv_eoi+0x40/0x140
Date 2017-02-20 22:00 +0100
Message-ID <td3dT-16y-5@gated-at.bofh.it> (permalink)
References <tcOoy-gL-19@gated-at.bofh.it> <tcOoy-gL-21@gated-at.bofh.it> <tcOoy-gL-17@gated-at.bofh.it> <tcTRf-3AN-13@gated-at.bofh.it>
Organization IBM Australia

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On Mon, 2017-02-20 at 21:55 +1100, Michael Ellerman wrote:
> But when we're called for CONFIG_DEBUG_SHIRQ get_irq() is not called,
> precisely because we're faking an interrupt.
> 
> I'm not sure if there's a good way to fix it :/

In the irq_replay path we have code to adjust the CPPR stack. We could
do something similar.

HOWEVER. Looking at current upstream code I don't understand the error,
the DEBUG_SHIRQ code is calling the driver's handler not the flow
handler so it shouldn't be called handle_fasteoi_irq or am I missing
something ?

Cheers,
Ben.

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Re: [next-20170217] WARN @/arch/powerpc/include/asm/xics.h:124  .icp_hv_eoi+0x40/0x140 Sachin Sant <sachinp@linux.vnet.ibm.com> - 2017-02-20 06:10 +0100
  Re: [next-20170217] WARN @/arch/powerpc/include/asm/xics.h:124 .icp_hv_eoi+0x40/0x140 Michael Ellerman <mpe@ellerman.id.au> - 2017-02-20 12:00 +0100
    Re: [next-20170217] WARN @/arch/powerpc/include/asm/xics.h:124  .icp_hv_eoi+0x40/0x140 Benjamin Herrenschmidt <benh@au1.ibm.com> - 2017-02-20 22:00 +0100
      Re: [next-20170217] WARN @/arch/powerpc/include/asm/xics.h:124  .icp_hv_eoi+0x40/0x140 Thomas Gleixner <tglx@linutronix.de> - 2017-02-20 23:10 +0100
        Re: [next-20170217] WARN @/arch/powerpc/include/asm/xics.h:124  .icp_hv_eoi+0x40/0x140 Benjamin Herrenschmidt <benh@au1.ibm.com> - 2017-02-20 23:20 +0100

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