linux-kernel - Re: [PATCH] generic-ipi: add lock context annotations

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Date:	Mon, 22 Nov 2010 13:46:43 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jaxboe@...ionio.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] generic-ipi: add lock context annotations

On Mon, 2010-11-22 at 16:33 +0900, Namhyung Kim wrote:
> The ipi_call_[un]lock[_irq] functions grab/release a spin lock
> but were missing proper annotations. Add it.

I really have to ask why bother? Why not add some smarts to whatever
uses these annotations?

> Signed-off-by: Namhyung Kim <namhyung@...il.com>
> ---
>  kernel/smp.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/smp.c b/kernel/smp.c
> index 12ed8b0..5a62f1f 100644
> --- a/kernel/smp.c
> +++ b/kernel/smp.c
> @@ -511,21 +511,25 @@ int smp_call_function(smp_call_func_t func, void *info, int wait)
>  EXPORT_SYMBOL(smp_call_function);
>  
>  void ipi_call_lock(void)
> +	__acquires(call_function.lock)
>  {
>  	raw_spin_lock(&call_function.lock);
>  }
>  
>  void ipi_call_unlock(void)
> +	__releases(call_function.lock)
>  {
>  	raw_spin_unlock(&call_function.lock);
>  }
>  
>  void ipi_call_lock_irq(void)
> +	__acquires(call_function.lock)
>  {
>  	raw_spin_lock_irq(&call_function.lock);
>  }
>  
>  void ipi_call_unlock_irq(void)
> +	__releases(call_function.lock)
>  {
>  	raw_spin_unlock_irq(&call_function.lock);
>  }


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