linux-kernel - Re: [PATCH] x86, tboot: iomem fixes

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Date:	Sat, 20 Jul 2013 09:34:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Qiaowei Ren <qiaowei.ren@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Gang Wei <gang.wei@...el.com>
Subject: Re: [PATCH] x86, tboot: iomem fixes


* Qiaowei Ren <qiaowei.ren@...el.com> wrote:

> +#define SINIT_MLE_DATA_VTD_DMAR_OFF	140

>  	/* get addr of DMAR table */
> +	dmar_tbl_off = readl(heap_ptr + SINIT_MLE_DATA_VTD_DMAR_OFF);
>  	dmar_tbl = (struct acpi_table_header *)(heap_ptr +
> -		   ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
> -		   sizeof(u64));
> +			dmar_tbl_off - sizeof(u64));

So the offset of ->vtd_dmars_off within struct sinit_mle_data is 140?

The new code is less readable: what's wrong with getting the offset 
automatically via C, instead of hardcoding it manually? You can use 
offsetof() primitive for increased readability.

Thanks,

	Ingo
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