linux-kernel - Re: [PATCH] x86: ioport

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Date:	Sun, 6 Jan 2008 01:47:47 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Miguel Botón <mboton.lkml@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	tglx@...utronix.de
Subject: Re: [PATCH] x86: ioport_{32|64}.c unification

On Sunday 06 January 2008, Miguel Botón wrote:
> +#ifdef CONFIG_X86_32
> +asmlinkage long sys_iopl(unsigned long regsp)
> +#else
> +asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs)
> +#endif
> +{
> +#ifdef CONFIG_X86_32
> +       volatile struct pt_regs *regs = (struct pt_regs *)&regsp;
> +       unsigned int level = regs->bx;
> +#endif

This #ifdef overload could probably be avoided if you just move
the body of this function into an extra place and do

static int do_iopl(unsigned int level, unsigned long *flags)
{
        unsigned int old = (*flags >> 12) & 3;
	...
        *flags = (*flags & ~X86_EFLAGS_IOPL) | (level << 12);;
}

#ifdef CONFIG_X86_32
asmlinkage long sys_iopl(unsigned long regsp)
{
	/* why is this volatle anyway? */
	volatile struct pt_regs *regs = (struct pt_regs *)&regsp;
	unsigned int level = regs->bx;
	return do_iopl(regs->bx, &regs->flags);
}
#else
asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs)
{
	return do_iopl(level, &regs->flags);
}
#endif

	Arnd <><
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