linux-kernel - Re: [patch 00/26] Xen-paravirt_ops: Xen guest implementation for paravirt

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Date:	Fri, 16 Mar 2007 18:59:23 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 00/26] Xen-paravirt_ops: Xen guest implementation for paravirt_ops interface

On Fri, Mar 16, 2007 at 10:26:55AM -0700, Jeremy Fitzhardinge wrote:
> +#ifdef CONFIG_HIGHPTE
> +	.kmap_atomic_pte = native_kmap_atomic_pte,
> +#else
> +	.kmap_atomic_pte = paravirt_nop,
> +#endif

This is ifdefing is quite ugly.  Shouldn't native_kmap_atomic_pte
just be a noop in the !CONFIG_HIGHPTE case?

> -void *kmap_atomic(struct page *page, enum km_type type)
> +void *_kmap_atomic(struct page *page, enum km_type type, pgprot_t prot)

We normally call our "secial" function __foo, not _foo.  But in this
case it really should have a more meaningfull name like
kmap_atomic_prot anyway.

> +void *kmap_atomic(struct page *page, enum km_type type)
> +{
> +	return _kmap_atomic(page, type, kmap_prot);

And this one should probably be an inline.

> +static inline void *native_kmap_atomic_pte(struct page *page, enum km_type type)
> +{
> +	return kmap_atomic(page, type);
> +}
> +
> +#ifndef CONFIG_PARAVIRT
> +#define kmap_atomic_pte(page, type)	kmap_atomic(page, type)
> +#endif

This is all getting rather ugly just for your pagetable hackery.

-
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