linux-kernel - Re: [PATCH 0/5] X86/XEN: Merge x86_init.paging.pagetable_setup_start and x86_init.paging.pagetable_setup

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Date:	Tue, 21 Aug 2012 12:09:36 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Attilio Rao <attilio.rao@...rix.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH 0/5] X86/XEN: Merge x86_init.paging.pagetable_setup_start
 and x86_init.paging.pagetable_setup_done PVOPS and document the semantic

On Tue, 21 Aug 2012, Attilio Rao wrote:
> Currently the definition of x86_init.paging.pagetable_setup_start and
> x86_init.paging.pagetable_setup_done is twisted and not really well
> defined (in terms of prototypes desired). More specifically:
> pagetable_setup_start:
>  * it is a nop on x86_32
>  * it is a nop for the XEN case
>  * cleans up the boot time page table in the x86_64 case

the description is wrong: you swapped x86_32 and x86_64 here


> pagetable_setup_done:
>  * it is a nop on x86_32
>  * sets up accessor functions for pagetable manipulation, for the
>    XEN case
>  * it is a nop on x86_64
> 
> Most of this logic can be skipped by creating a new PVOPS that can handle
> pagetable setup and pre/post operations on it.
> The new PVOPS must be called only once, during boot-time setup and
> after the direct mapping for physical memory is available.
> 
> Attilio Rao (5):
>   XEN: Remove the base argument from
>     x86_init.paging.pagetable_setup_done PVOPS
>   XEN: Remove the base argument from
>     x86_init.paging.pagetable_setup_start PVOPS
>   X86/XEN: Introduce the x86_init.paging.pagetable_init() PVOPS
>   X86/XEN: Retire now unused x86_init.paging.pagetable_setup_start and
>     x86_init.paging.pagetable_setup_done PVOPS
>   X86/XEN: Add few lines explaining simple semantic for
>     x86_init.paging.pagetable_init PVOPS
> 
>  arch/x86/include/asm/pgtable_types.h |    6 ++----
>  arch/x86/include/asm/x86_init.h      |   11 +++++++----
>  arch/x86/kernel/setup.c              |    4 +---
>  arch/x86/kernel/x86_init.c           |    4 +---
>  arch/x86/mm/init_32.c                |   12 ++++++------
>  arch/x86/xen/mmu.c                   |   18 +++++++-----------
>  6 files changed, 24 insertions(+), 31 deletions(-)
> 
> -- 
> 1.7.2.5
> 
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