linux-kernel - Re: [PATCH 2 of 7] x86/pvops: add a paravirt_ident functions to allow special patching

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Date:	Thu, 29 Jan 2009 02:46:23 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Xen-devel <xen-devel@...ts.xensource.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Zachary Amsden <zach@...are.com>,
	Ravikiran Thirumalai <kiran@...lemp.com>
Subject: Re: [PATCH 2 of 7] x86/pvops: add a paravirt_ident functions to allow
 special patching

Rusty Russell wrote:
> I think I prefer:
>
> /* make_pte etc and pgd_val etc are identity functions. */
> #define paravirt_native_page_op \
> 	(sizeof(pte_t) == sizeof(u64) ? paravirt_ident_64 : paravirt_ident_32)
>
> Then use that everywhere rather than these defines?
>   

Hm, also I don't think that will work because paravirt_ident_32|64 
return different types.  The compiler might promote paravirt_ident_32 to 
returning a 64-bit number, which would be a bit disastrous. 

    J
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