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Date: Fri, 8 Apr 2022 16:17:16 +0200 From: Arnd Bergmann <arnd@...db.de> To: Daniel Thompson <daniel.thompson@...aro.org> Cc: Arnd Bergmann <arnd@...db.de>, Greg KH <gregkh@...uxfoundation.org>, Hitomi Hasegawa <hasegawa-hitomi@...itsu.com>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, SoC Team <soc@...nel.org>, "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>, Sumit Garg <sumit.garg@...aro.org>, Olof Johansson <olof@...om.net>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Jiri Slaby <jirislaby@...nel.org>, Jason Wessel <jason.wessel@...driver.com>, Doug Anderson <dianders@...omium.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, kgdb-bugreport@...ts.sourceforge.net, Peter Zijlstra <peterz@...radead.org>, Mike Travis <mike.travis@....com> Subject: Re: [PATCH v3 1/1] soc: fujitsu: Add A64FX diagnostic interrupt driver On Fri, Apr 8, 2022 at 3:32 PM Daniel Thompson <daniel.thompson@...aro.org> wrote: > On Thu, Mar 31, 2022 at 05:44:55PM +0200, Arnd Bergmann wrote: > > There is some prior art for this sort of feature. AFAICT SGI UV has a > similar mechanism that can send an NMI-with-no-side-channel to the > kernel. The corresponding driver offers a range of actions using a > module parameter: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/platform/uv/uv_nmi.c#n180 > > I don't think a hardcoded 'c' makes any sense. With a hardcoded argument > it is just obfuscation. However it is certainly seems attractive to be > able to reuse handle_sysrq() to provide a more powerful set of actions. How about a module parameter that allows picking a sysrq character then? Arnd
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