From: Daniel Thompson <daniel.thompson@linaro.org>
To: Sumit Garg <sumit.garg@linaro.org>
Cc: Doug Anderson <dianders@chromium.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-serial@vger.kernel.org,
kgdb-bugreport@lists.sourceforge.net,
Jiri Slaby <jslaby@suse.com>,
Russell King - ARM Linux admin <linux@armlinux.org.uk>,
Jason Wessel <jason.wessel@windriver.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC 0/5] Introduce NMI aware serial drivers
Date: Thu, 13 Aug 2020 11:17:03 +0100 [thread overview]
Message-ID: <20200813101703.566thqmnc2d7cb3n@holly.lan> (raw)
In-Reply-To: <CAFA6WYPxieH6ZTa_BFdaLuiwbqAs6r7eKmxG7ci4XtyRONGN7g@mail.gmail.com>
On Thu, Aug 13, 2020 at 02:55:12PM +0530, Sumit Garg wrote:
> On Thu, 13 Aug 2020 at 05:38, Doug Anderson <dianders@chromium.org> wrote:
> > On Wed, Aug 12, 2020 at 8:27 AM Doug Anderson <dianders@chromium.org> wrote:
> > > One
> > > last worry is that I assume that most people testing (and even
> > > automated testing labs) will either always enable NMI or won't enable
> > > NMI. That means that everyone will be only testing one codepath or
> > > the other and (given the complexity) the non-tested codepath will
> > > break.
> > >
>
> The current patch-set only makes this NMI to work when debugger (kgdb)
> is enabled which I think is mostly suitable for development
> environments. So most people testing will involve existing IRQ mode
> only.
>
> However, it's very much possible to make NMI mode as default for a
> particular serial driver if the underlying irqchip supports it but it
> depends if we really see any production level usage of NMI debug
> feature.
The effect of this patch is not to make kgdb work from NMI it is to make
(some) SysRqs work from NMI. I think that only allowing it to deploy for
kgdb users is a mistake.
Having it deploy automatically for kgdb users might be OK but it seems
sensible to make this feature available for other users too.
Daniel.
next prev parent reply other threads:[~2020-08-13 10:17 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-21 12:10 [RFC 0/5] Introduce NMI aware serial drivers Sumit Garg
2020-07-21 12:10 ` [RFC 1/5] tty/sysrq: Make sysrq handler NMI aware Sumit Garg
2020-08-12 23:59 ` Doug Anderson
2020-08-14 7:24 ` Sumit Garg
2020-08-14 14:34 ` peterz
2020-08-14 14:57 ` Doug Anderson
2020-08-17 14:08 ` Sumit Garg
2020-08-17 17:19 ` Doug Anderson
2020-08-18 13:30 ` Sumit Garg
2020-07-21 12:10 ` [RFC 2/5] serial: core: Add framework to allow NMI aware serial drivers Sumit Garg
2020-08-12 23:59 ` Doug Anderson
2020-08-13 14:19 ` Sumit Garg
2020-08-13 14:37 ` Doug Anderson
2020-08-14 11:17 ` Sumit Garg
2020-08-14 14:13 ` Daniel Thompson
2020-08-17 12:27 ` Sumit Garg
2020-08-17 13:57 ` Doug Anderson
2020-08-17 14:23 ` Sumit Garg
2020-08-17 14:32 ` Daniel Thompson
2020-08-18 13:18 ` Sumit Garg
2020-08-17 14:28 ` Daniel Thompson
2020-08-18 13:06 ` Sumit Garg
2020-08-14 14:43 ` Doug Anderson
2020-08-17 12:29 ` Sumit Garg
2020-07-21 12:10 ` [RFC 3/5] serial: amba-pl011: Re-order APIs definition Sumit Garg
2020-07-21 12:10 ` [RFC 4/5] serial: amba-pl011: Enable NMI aware uart port Sumit Garg
2020-08-12 23:59 ` Doug Anderson
2020-08-13 10:34 ` Sumit Garg
2020-07-21 12:10 ` [RFC 5/5] serial: Remove KGDB NMI serial driver Sumit Garg
2020-08-11 13:50 ` [RFC 0/5] Introduce NMI aware serial drivers Sumit Garg
2020-08-11 13:58 ` Greg Kroah-Hartman
2020-08-11 14:29 ` Sumit Garg
2020-08-11 14:58 ` Greg Kroah-Hartman
2020-08-11 17:15 ` Doug Anderson
2020-08-12 14:52 ` Sumit Garg
2020-08-12 15:27 ` Doug Anderson
2020-08-13 0:08 ` Doug Anderson
2020-08-13 9:25 ` Sumit Garg
2020-08-13 10:17 ` Daniel Thompson [this message]
2020-08-14 12:06 ` Sumit Garg
2020-08-14 14:18 ` Daniel Thompson
2020-08-17 5:12 ` Sumit Garg
2020-08-17 9:28 ` Daniel Thompson
2020-08-17 14:12 ` Sumit Garg
2020-08-13 15:26 ` Doug Anderson
2020-08-14 12:50 ` Sumit Garg
2020-08-12 5:48 ` Sumit Garg
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