Messages in this thread | | | From | Andy Shevchenko <> | Date | Tue, 30 Oct 2018 11:54:03 +0200 | Subject | Re: Re: [PATCH V3 3/5] misc/pvpanic: add MMIO support |
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On Tue, Oct 30, 2018 at 5:08 AM <peng.hao2@zte.com.cn> wrote: > >On Mon, Oct 29, 2018 at 12:54 PM <peng.hao2@zte.com.cn> wrote:
> >I would consider it as a bug if on some architectures iounmap() is not > >able to take a base got from ioport_map().
> I added TYPE_PVPANIC_MMIO in QEMU to the architecture that does not support IOPORT. > If some architectures does not support IOPORT, set TYPE_PVPANIC_MMIO in qemu. This setting is reflected in the kernel pvpanic driver > and does not invoke ioport_map (calling ioremap). So I think the situation you described above will not happen.
> But I should resume one check like this to deal with the failure of ioremap/ioport_map. > if (base) > iounmap(base)
I'm a bit confused, how come that base == NULL when you about to call iounmap()? Where you would like to put this check?
> The patch of QEMU is still in review.
-- With Best Regards, Andy Shevchenko
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