linux-kernel - Re: [PATCH] tty/powerpc: fix build break with ehv

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Message-ID: <4E568E19.405@freescale.com>
Date:	Thu, 25 Aug 2011 13:02:01 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Greg KH <greg@...ah.com>
CC:	<sfr@...b.auug.org.au>, <linux-next@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...abs.org>
Subject: Re: [PATCH] tty/powerpc: fix build break with ehv_bytechan.c on allyesconfig

Greg KH wrote:
> tested doesn't mean that it shouldn't still build properly for other
> platforms, right?

The problem is the dependency on MSR_GS, which is defined only for Book-E
PowerPC chips, not all PowerPC.

So I gave it some more thought, and technically ePAPR extends beyond Book-E, so
it's wrong for the driver to depend on anything specific to Book-E.  I've
removed the code that breaks:

	/* Check if we're running as a guest of a hypervisor */
	if (!(mfmsr() & MSR_GS))
		return;

> What is keeping the driver from building on all PPC, or even all arches
> today?

I've made a few changes, and it builds on all PPC now.  I'll post a new patch.

-- 
Timur Tabi
Linux kernel developer at Freescale

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