linux-kernel - Re: [PATCH] ARM: omap2: drop broken broadcast timer hack

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Message-ID: <20200528155759.GP37466@atomide.com>
Date:   Thu, 28 May 2020 08:57:59 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     arm@...nel.org, Rob Herring <robh@...nel.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Lokesh Vutla <lokeshvutla@...com>, Keerthy <j-keerthy@...com>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        linux-kernel@...r.kernel.org, Tero Kristo <t-kristo@...com>,
        Olof Johansson <olof@...om.net>, linux-omap@...r.kernel.org,
        afzal mohammed <afzal.mohd.ma@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: omap2: drop broken broadcast timer hack

* Tony Lindgren <tony@...mide.com> [200528 13:51]:
> * Tony Lindgren <tony@...mide.com> [200528 13:47]:
> > * Arnd Bergmann <arnd@...db.de> [200528 09:20]:
> > > The OMAP4 timer code had a special hack for using the broadcast timer
> > > without SMP. Since the dmtimer is now gone, this also needs to be dropped
> > > to avoid a link failure for non-SMP AM43xx configurations:
> > > 
> > > kernel/time/tick-broadcast.o: in function `tick_device_uses_broadcast':
> > > tick-broadcast.c:(.text+0x130): undefined reference to `tick_broadcast'
> > 
> > Hmm this sounds like a regression though. Isn't this needed for using
> > the ARM local timers on non-SMP SoC, so a separate timer from dmtimer?
> > 
> > I've probably removed something accidentally to cause this.
> 
> Sounds like arch/arm/mach-omap2/Makefile change needs to be removed
> to always still build in timer.o. And probably timer.c needs back
> the ifdef for CONFIG_SOC_HAS_REALTIME_COUNTER.
> 
> I'll take a look today.

I've sent a patch along those lines as:

[PATCH] ARM: OMAP2+: Fix regression for using local timer on non-SMP SoCs

A link for the patch at [0] below.

Regards,

Tony

[0] https://lore.kernel.org/linux-omap/20200528155453.8585-1-tony@atomide.com/T/#u