From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexander Graf <agraf@suse.de>
Subject: Re: [PATCH 1/4] KVM: PPC: BOOK3S: PR: Emulate virtual timebase register
Date: Fri, 06 Jun 2014 12:44:19 +0200
Message-ID: <53919B83.4070308@suse.de>
References: <1401970085-14493-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1401970085-14493-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
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Cc: linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org,
	kvm@vger.kernel.org
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	benh@kernel.crashing.org, paulus@samba.org
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In-Reply-To: <1401970085-14493-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
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On 05.06.14 14:08, Aneesh Kumar K.V wrote:
> virtual time base register is a per VM, per cpu register that needs
> to be saved and restored on vm exit and entry. Writing to VTB is not
> allowed in the privileged mode.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

For some reason BUG() doesn't always trigger the "execution stops here" 
logic in gcc. So I've squashed this patch into yours.


Alex


diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 3e7085d..99de6ad 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1206,6 +1206,7 @@ static inline unsigned long mfvtb (void)
       * capture that.
       */
      BUG();
+    return 0;
  }

  #ifdef __powerpc64__