linux-kernel - Re: [Xen-devel] [PATCH 1/3] xen/pv-on-hvm kexec: add quirk for Xen 3.4 and shutdown watches.

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Date:	Mon, 15 Oct 2012 17:14:18 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Olaf Hering <olaf@...fle.de>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/3] xen/pv-on-hvm kexec: add quirk for Xen
 3.4 and shutdown watches.

On Mon, 2012-10-15 at 17:05 +0100, Ian Campbell wrote:
> 
> > +static bool xen_strict_xenbus_quirk()
> > +{
> > +     uint32_t eax, ebx, ecx, edx, base;
> > +
> > +     base = xen_cpuid_base();
> > +     cpuid(base + 1, &eax, &ebx, &ecx, &edx);
> 
> This breaks on ARM because this is an x86 specific function. Can we
> ifdef it or properly wrap it in an arch interface please. 

Quick-n-dirty fix. 

8<----------------------------

>From fe19515d8f7bed49c4474f475e6a8cbbdc5eb3f2 Mon Sep 17 00:00:00 2001
From: Ian Campbell <ian.campbell@...rix.com>
Date: Mon, 15 Oct 2012 17:06:47 +0100
Subject: [PATCH] xen: fix build on ARM

xen_strict_xenbus_quirk is x86 specific.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
---
 drivers/xen/xenbus/xenbus_xs.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index 48220e1..b46ad11 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -619,6 +619,8 @@ static struct xenbus_watch *find_watch(const char *token)
 
 	return NULL;
 }
+
+#ifdef CONFIG_X86
 /*
  * Certain older XenBus toolstack cannot handle reading values that are
  * not populated. Some Xen 3.4 installation are incapable of doing this
@@ -637,6 +639,10 @@ static bool xen_strict_xenbus_quirk()
 	return false;
 
 }
+#else
+static bool xen_strict_xenbus_quirk(void) { return false; }
+#endif
+
 static void xs_reset_watches(void)
 {
 	int err, supported = 0;
-- 
1.7.2.5



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