linux-kernel - Re: [patch 2/2] x86_64: ticket lock spinlock

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Date:	Wed, 8 Aug 2007 12:26:55 +0200
From:	Andi Kleen <ak@...e.de>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-arch@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2/2] x86_64: ticket lock spinlock


>   *
>   * (the type definitions are in asm/spinlock_types.h)
>   */
>  
> +#if (NR_CPUS > 256)
> +#error spinlock supports a maximum of 256 CPUs
> +#endif
> +
>  static inline int __raw_spin_is_locked(raw_spinlock_t *lock)
>  {
> -	return *(volatile signed int *)(&(lock)->slock) <= 0;
> +	int tmp = *(volatile signed int *)(&(lock)->slock);

Why is slock not volatile signed int in the first place? 

> -	int oldval;
> +	short tmp;
> +        short oldval;

Broken white space?


-Andi
-
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