linux-kernel - Re: [PATCH 06/10] percpu: kill percpu

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Message-ID: <12c511ca0903111136h3805a106i484a32fd2972c568@mail.gmail.com>
Date:	Wed, 11 Mar 2009 11:36:58 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	rusty@...tcorp.com.au, tglx@...utronix.de, x86@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, jeremy@...p.org,
	cpw@....com, mingo@...e.hu
Subject: Re: [PATCH 06/10] percpu: kill percpu_alloc() and friends

On Wed, Feb 18, 2009 at 5:04 AM, Tejun Heo <tj@...nel.org> wrote:
> +static inline void *__alloc_percpu(size_t size, size_t align)
>  {
> +       /*
> +        * Can't easily make larger alignment work with kmalloc.  WARN
> +        * on it.  Larger alignment should only be used for module
> +        * percpu sections on SMP for which this path isn't used.
> +        */
> +       WARN_ON_ONCE(align > __alignof__(unsigned long long));
>        return kzalloc(size, gfp);
>  }

This WARN_ON just pinged for me when I built & ran linux-next tag next-20090311

Stack trace from the WARN_ON pointed to __create_workqueue_key() which
does:

         wq->cpu_wq = alloc_percpu(struct cpu_workqueue_struct);

and the cpu_workqueue_struct is defined as ____cacheline_aligned

I hit this on ia64, but all this code looks generic.

-Tony
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