linux-kernel - Re: [RFC v3][PATCH 2/2] intel_txt: Intel(R) TXT and tboot kernel support

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Message-ID: <20090508095748.GH3559@elte.hu>
Date:	Fri, 8 May 2009 11:57:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Joseph Cihula <joseph.cihula@...el.com>
Cc:	linux-kernel@...r.kernel.org, arjan@...ux.intel.com, hpa@...or.com,
	andi@...stfloor.org, chrisw@...s-sol.org, jmorris@...ei.org,
	jbeulich@...ell.com, peterm@...hat.com, gang.wei@...el.com,
	shane.wang@...el.com
Subject: Re: [RFC v3][PATCH 2/2] intel_txt: Intel(R) TXT and tboot kernel
	support


* Joseph Cihula <joseph.cihula@...el.com> wrote:

> +	/* if we're being called before the 1:1 mapping is set up then just
> +	   return and let the normal shutdown happen; this should only be
> +	   due to very early panic() */
> +	if (!tboot_pg_dir)
> +		return;

Please use the customary comment style:

  /*
   * Comment .....
   * ...... goes here:
   */

specified in Documentation/CodingStyle. Please fix this in all other 
multi-line comments in your patch as well.


> +	if (shutdown_type == TB_SHUTDOWN_S3) {
> +		tboot_shared->num_mac_regions = 3;
> +		/* S3 resume code */
> +		tboot_shared->mac_regions[0].start =
> +			PFN_PHYS(PFN_DOWN(acpi_wakeup_address));
> +		tboot_shared->mac_regions[0].size =
> +			PFN_UP(WAKEUP_SIZE) << PAGE_SHIFT;
> +		/* AP trampoline code */
> +		tboot_shared->mac_regions[1].start =
> +			PFN_PHYS(PFN_DOWN(virt_to_phys(trampoline_base)));
> +		tboot_shared->mac_regions[1].size =
> +			PFN_UP(TRAMPOLINE_SIZE) << PAGE_SHIFT;
> +		/* kernel code + data + bss */
> +		tboot_shared->mac_regions[2].start =
> +			PFN_PHYS(PFN_DOWN(virt_to_phys(&_text)));
> +		tboot_shared->mac_regions[2].size =
> +			PFN_PHYS(PFN_UP(virt_to_phys(&_end))) -
> +			PFN_PHYS(PFN_DOWN(virt_to_phys(&_text)));
> +	}
> +
> +	tboot_shared->shutdown_type = shutdown_type;
> +
> +	switch_to_tboot_pt();
> +
> +	((void(*)(void))(unsigned long)tboot_shared->shutdown_entry)();

shutdown_entry should probably have a proper function pointer type, 
to avoid this ugliness.

	Ingo
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