linux-kernel - Re: [PATCH] intel-iommu: Work around yet another BIOS bug

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Date:	Thu, 20 Aug 2009 02:44:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	torvalds@...ux-foundation.org,
	Faidon Liambotis <paravoid@...ian.org>,
	Matt Domsch <Matt_Domsch@...l.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, bero@...linux.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] intel-iommu: Work around yet another BIOS bug

On Thu, 20 Aug 2009 09:01:58 +0100 David Woodhouse <dwmw2@...radead.org> wrote:

> +	if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) {
> +		/* Promote an attitude of violence to a BIOS engineer today */
> +		WARN(1, "Your BIOS is broken; DMAR reported at address %llx returns all ones!\n"
> +		     "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
> +		     drhd->reg_base_addr,

Printing a u64 with %ll will (still) generate a warning on four architectures.

> +		     dmi_get_system_info(DMI_BIOS_VENDOR),
> +		     dmi_get_system_info(DMI_BIOS_VERSION),
> +		     dmi_get_system_info(DMI_PRODUCT_VERSION));
> +		goto err_unmap;
> +	}
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