linux-kernel - Re: [PATCH] x86/intel_rdt: Add cpus

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Message-ID: <alpine.DEB.2.20.1703311104300.1780@nanos>
Date:   Fri, 31 Mar 2017 11:15:22 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Fenghua Yu <fenghua.yu@...el.com>
cc:     Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mike Galbraith <efault@....de>, Shaohua Li <shli@...com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] x86/intel_rdt: Add cpus_list rdtgroup file

On Wed, 29 Mar 2017, Fenghua Yu wrote:
> >  static int rdtgroup_cpus_show(struct kernfs_open_file *of,
> > -			      struct seq_file *s, void *v)
> > +			      struct seq_file *s, void *v,
> > +			      unsigned long flags)
> >  {
> > +	const char *fmt = flags & RFTYPE_FLAGS_CPUS_LIST ? "%*pbl\n" : "%*pb\n";
> 
> Change to:
> + const char *fmt = strcmp(of->kn->priv, "cpus") ? "%*pbl\n" : "%*pb\n";

You couldn't come up with a more horrible hack, right?

Jiri was right with adding the flag to the base files, just the propagation
through the callbacks sucks. What's wrong with:

	struct rftype *rft = of->kn->priv;
	bool list = rtf->flags & RFTYPE_FLAGS_CPUS_LIST;

Thanks,

	tglx