linux-kernel - Re: 2.6.25-rc5-mm1 (paravirt/vsmp/no PCI)

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Date:	Tue, 11 Mar 2008 18:51:38 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ravikiran G Thirumalai <kiran@...lex86.org>
CC:	Randy Dunlap <randy.dunlap@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	virtualization@...ts.osdl.org, linux-kernel@...r.kernel.org,
	Glauber de Oliveira Costa <glommer@...il.com>,
	shai@...lex86.org
Subject: Re: 2.6.25-rc5-mm1 (paravirt/vsmp/no PCI)

Ravikiran G Thirumalai wrote:
> Would anyone have objection to have PARAVIRT depend on PCI, since the
> vsmp paravirt bits depend on PCI cfg space to determine if the system is
> vsmp?   If not, this patch would suffice.
>   

NAK.  Xen doesn't depend on PCI at all.   Why not make VSMP depend on 
PCI?  Then you could put something like:

#ifdef CONFIG_X86_VSMP
extern void vsmp_init(void);
extern int is_vsmp_box(void);
#else
static inline void vsmp_init(void)
{
}

static inline int is_vsmp_box(void)
{
	return 0;
}
#endif


in an appropriate header.

Hm, looks like arch/x86/kernel/Makefile should be

obj-$(CONFIG_X86_VSMP)		+= vsmp_64.o


rather than making it depend directly on CONFIG_PARAVIRT.

    J
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