linux-kernel - Re: [PATCH 1/7] header and stubs for paravirtualizing critical operations

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Date:	Sun, 29 Oct 2006 08:40:07 -0800
From:	Andi Kleen <ak@...e.de>
To:	virtualization@...ts.osdl.org
Cc:	Chris Wright <chrisw@...s-sol.org>, akpm@...l.org, ak@....de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] header and stubs for paravirtualizing critical operations


Can you add a high level comment to entry.S what paravirt mode
is all about and perhaps a quick cheat sheet on the macros?

> +/* SMP boot always wants to use real time delay to allow sufficient time
> for + * the APs to come online */
> +#define USE_REAL_TIME_DELAY

That's ugly. Can't you call different wait functions for that case instead?

> +#ifdef CONFIG_PARAVIRT
> +#include <asm/paravirt.h>
> +#else
> +static inline void init_IRQ(void)
> +{
> +	native_init_IRQ();
> +}
> +#endif /* CONFIG_PARAVIRT */

You could probably avoid a lot of ifdefs by strategic use of 
__attribute__((weak))

> +#ifdef CONFIG_PARAVIRT
> +#include <asm/paravirt.h>
> +#else

This is probably a good candidate for rename to native + wrapper
macros too. Otherwise we'll always have to hack two different
places later.

-Andi
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