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From: Andi Kleen <ak@suse.de>
To: Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [RFC PATCH 01/09] robust VM per_cpu core
Date: Wed, 17 May 2006 11:17:04 +0200
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Cc: Andrew Morton <akpm@osdl.org>, linux-mips@linux-mips.org,
	David Mosberger-Tang <davidm@hpl.hp.com>, linux-ia64@vger.kernel.org,
	Martin Mares <mj@atrey.karlin.mff.cuni.cz>, spyro@f2s.com,
	Joe Taylor <joe@tensilica.com>, linuxppc-dev@ozlabs.org,
	Paul Mackerras <paulus@samba.org>, benedict.gaster@superh.com,
	sam@ravnborg.org, bjornw@axis.com, kenneth.w.chen@intel.com,
	Ingo Molnar <mingo@elte.hu>, kiran@scalex86.org,
	clameter@sgi.com, Nick Piggin <nickpiggin@yahoo.com.au>,
	grundler@parisc-linux.org, arnd@arndb.de,
	Rusty Russell <rusty@rustcorp.com.au>, starvik@axis.com,
	Linus Torvalds <torvalds@osdl.org>,
	Thomas Gleixner <tglx@linutronix.de>, rth@twiddle.net,
	Chris Zankel <chris@zankel.net>, tony.luck@intel.com,
	LKML <linux-kernel@vger.kernel.org>, ralf@linux-mips.org,
	Marc Gauthier <marc@tensilica.com>, lethal@linux-sh.org,
	schwidefsky@de.ibm.com, linux390@de.ibm.com, davem@davemloft.net,
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> As well as the following three functions:
>
> pud_t *pud_boot_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long addr,
>                      int cpu);
> pmd_t *pmd_boot_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr,
>                      int cpu);
> pte_t *pte_boot_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long addr,
>                      int cpu);

I'm not sure you can just put them like this into generic code. Some 
architectures are doing strange things with them.

And we already have boot_ioremap on some architectures. Why is that not 
enough? 

-Andi