linux-kernel - Re: [PATCH 01/27] smpboot: Provide a generic method to boot secondary processors

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Message-ID: <alpine.LFD.2.02.1206041513000.3086@ionos>
Date:	Mon, 4 Jun 2012 15:18:56 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
cc:	Sam Ravnborg <sam@...nborg.org>, peterz@...radead.org,
	paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	mingo@...nel.org, yong.zhang0@...il.com, akpm@...ux-foundation.org,
	vatsa@...ux.vnet.ibm.com, rjw@...k.pl, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, nikunj@...ux.vnet.ibm.com,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venki@...gle.com>
Subject: Re: [PATCH 01/27] smpboot: Provide a generic method to boot secondary
 processors

On Mon, 4 Jun 2012, Srivatsa S. Bhat wrote:
> On 06/04/2012 04:02 PM, Thomas Gleixner wrote:
> I can add the prototype w/o the __weak prefix and the #ifndef magic in
> include/linux/smpboot.h (which I will, and include it in v2).
> 
> However, I can't get rid of the #ifndef magic in kernel/smpboot.c because
> it will cause build failures on x86.
> 
> I addressed this same issue in another email:
> https://lkml.org/lkml/2012/6/3/33

> In short, to avoid breaking build on x86.
> We wanted to follow the x86 convention of having static inline functions in
> arch/x86/include/asm/smp.h and use the smp_ops structure to route the calls
> to x86 or xen as appropriate (see patch 4 in this series).

Oh no. That's not really a good argument.

There is no reason why this _must_ be an inline function on x86. It
can be a proper function in arch/x86/kernel/smpboot.c as well.

The alternative solution is to generalize the smp_ops approach and get
rid of the weak implementations completely.

Thanks,

	tglx
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