linux-kernel - Re: [PATCH 5/5] ACPI, APEI, Fix ERST MOVE

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Date:	Tue, 21 Sep 2010 14:47:18 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 5/5] ACPI, APEI, Fix ERST MOVE_DATA instruction implementation

On Sun, Sep 19, 2010 at 11:00:35AM +0800, Huang Ying wrote:
> diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
> index 40b01c3..a103963 100644
> --- a/drivers/acpi/apei/erst.c
> +++ b/drivers/acpi/apei/erst.c
> @@ -266,13 +266,27 @@ static int erst_exec_move_data(struct apei_exec_context *ctx,
>  {
>  	int rc;
>  	u64 offset;
> +	void *src, *dst;
> +
> +	/* ioremap does not work in interrupt context */
> +	if (in_interrupt())
> +		return -EBUSY;

That breaks serialization of machine checks no? If the BIOS uses MOVE_DATA
How about using kmap_atomic instead?

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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