linux-kernel - RE: [PATCH 7/9] x86/topology.c: Support functions for BSP online/offline

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Date:	Mon, 7 Nov 2011 11:57:37 -0800
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: RE: [PATCH 7/9] x86/topology.c: Support functions for BSP
 online/offline

> > +static int bsp_hotpluggable;
> > +
> > +static int __init enable_bsp_hotplug(char *str)
> > +{
> > +	bsp_hotpluggable = 1;
> > +	return 0;
> 
> Any reason why you return 0 here? Most code I have seen similar to this,
> return 1. I understand that anything declared using early_param() would
> generate a warning if it returns non-zero, but I am not exactly sure
> about how it behaves with __setup(). Kindly give this some thought.

You're right. This function should return 1 here. The parameter setup function returns 1 for success and 0 for failure. The return value is checked in obsolete_checksetup():
                        } else if (p->setup_func(line + n))
                                return 1;

I will change this return value to 1 in the next version of the patch set.

BTW, some places in the current upstream do return 0 for success and return an error number for failure. Maybe we need to clean up them.

Thanks.

-Fenghua

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