linux-kernel - Re: [RFC PATCH v2 10/14] kernel/watchdog: Add a function to obtain the watchdog_allowed

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Date:   Wed, 10 Apr 2019 18:15:21 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
        Ashok Raj <ashok.raj@...el.com>,
        Andi Kleen <andi.kleen@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Ricardo Neri <ricardo.neri@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Don Zickus <dzickus@...hat.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frederic Weisbecker <frederic@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Babu Moger <babu.moger@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Colin Ian King <colin.king@...onical.com>,
        Byungchul Park <byungchul.park@....com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Christoffer Dall <cdall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        David Rientjes <rientjes@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v2 10/14] kernel/watchdog: Add a function to obtain
 the watchdog_allowed_mask

On Tue, Apr 09, 2019 at 01:34:21PM +0200, Peter Zijlstra wrote:
> On Wed, Feb 27, 2019 at 08:05:14AM -0800, Ricardo Neri wrote:
> > diff --git a/kernel/watchdog.c b/kernel/watchdog.c
> > index 8fbfda94a67b..367aa81294ef 100644
> > --- a/kernel/watchdog.c
> > +++ b/kernel/watchdog.c
> > @@ -44,7 +44,7 @@ int __read_mostly soft_watchdog_user_enabled = 1;
> >  int __read_mostly watchdog_thresh = 10;
> >  int __read_mostly nmi_watchdog_available;
> >  
> > -struct cpumask watchdog_allowed_mask __read_mostly;
> > +static struct cpumask watchdog_allowed_mask __read_mostly;
> >  
> >  struct cpumask watchdog_cpumask __read_mostly;
> >  unsigned long *watchdog_cpumask_bits = cpumask_bits(&watchdog_cpumask);
> 
> Hurmph, more struct cpumask, ideally this would get converted to
> cpumask_var_t, I don't think we need this before the allocators work, do
> we?

I see mm_init() is called before lockup_detector_init(); both from start_kernel().
Thus, IMHO, kzalloc should work at this point.

Thanks and BR,
Ricardo