linux-kernel - Re: [PATCH v2] serial/pmac_zilog: Remove flawed mitigation for rx irq flood

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Date: Sat, 6 Apr 2024 14:21:33 +1100 (AEDT)
From: Finn Thain <fthain@...ux-m68k.org>
To: Michael Ellerman <mpe@...erman.id.au>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    Jiri Slaby <jirislaby@...nel.org>, Nicholas Piggin <npiggin@...il.com>, 
    Christophe Leroy <christophe.leroy@...roup.eu>, 
    "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>, 
    "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>, linux-kernel@...r.kernel.org, 
    linux-serial@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
    linux-m68k@...ts.linux-m68k.org, 
    Benjamin Herrenschmidt <benh@...nel.crashing.org>, 
    Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v2] serial/pmac_zilog: Remove flawed mitigation for rx
 irq flood

On Fri, 5 Apr 2024, Michael Ellerman wrote:

> I assume you have tested this on an actual pmac, as well as qemu?
> 

I tested the patched driver and its console functionality using Zilog SCC 
hardware in a Mac IIci, as well as QEMU's q800 virtual machine.

That should suffice from a code coverage point-of-view, since 
pmz_receive_chars() is portable and independent of CONFIG_PPC_PMAC.

Moreover, I don't know how to get my PowerMac G3 to execute the kludge 
that's to be removed here. I can't prove it's impossible, though.