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Date:   Wed, 10 Apr 2019 18:15:21 -0700
From:   Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@suse.de>,
        Ashok Raj <ashok.raj@intel.com>,
        Andi Kleen <andi.kleen@intel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@intel.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org,
        Ricardo Neri <ricardo.neri@intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Tony Luck <tony.luck@intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Don Zickus <dzickus@redhat.com>,
        Nicholas Piggin <npiggin@gmail.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Frederic Weisbecker <frederic@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Babu Moger <babu.moger@oracle.com>,
        Paul Mackerras <paulus@samba.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
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        Byungchul Park <byungchul.park@lge.com>,
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Subject: Re: [RFC PATCH v2 10/14] kernel/watchdog: Add a function to obtain
 the watchdog_allowed_mask
Message-ID: <20190411011521.GB9936@ranerica-svr.sc.intel.com>
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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