linux-kernel - Re: + spin_lock_irq-enable-interrupts-while-spinning-i386-implementation.patch added to -mm tree

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Date:	Sat, 06 Jan 2007 14:35:53 -0800
From:	Daniel Walker <dwalker@...sta.com>
To:	linux-kernel@...r.kernel.org
Cc:	mm-commits@...r.kernel.org, kiran@...lex86.org, ak@...e.de,
	md@...gle.com, mingo@...e.hu, pravin.shelar@...softinc.com,
	shai@...lex86.org
Subject: Re: +
	spin_lock_irq-enable-interrupts-while-spinning-i386-implementation.patch
	added to -mm tree

On Wed, 2007-01-03 at 13:12 -0800, akpm@...l.org wrote:
> -# define __raw_spin_lock_irq(lock) __raw_spin_lock(lock)
> +
> +static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
> +{
> +       asm volatile("\n1:\t"
> +                    LOCK_PREFIX " ; decb %0\n\t"
> +                    "jns 3f\n"
> +                    STI_STRING "\n"
> +                    "2:\t"
> +                    "rep;nop\n\t"
> +                    "cmpb $0,%0\n\t"
> +                    "jle 2b\n\t"
> +                    CLI_STRING "\n"
> +                    "jmp 1b\n"
> +                    "3:\n\t"
> +                    : "+m" (lock->slock) : : "memory");
> +}
>  #endif
>   

This doesn't compile when CONFIG_PARAVIRT is enabled. It changes the
CLI_STRING and STI_STRING values.

Daniel

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