[3.19.y-ckt stable] Patch "Drivers: hv: vmbus: Correcting truncation error for constant HV_CRASH_CTL_CRASH_NOTIFY" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    Drivers: hv: vmbus: Correcting truncation error for constant HV_CRASH_CTL_CRASH_NOTIFY

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt2.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 000c4860134480f48b8fea9a46dc6fbfb0e80070 Mon Sep 17 00:00:00 2001
From: Nick Meier <nmeier at microsoft.com>
Date: Wed, 18 Mar 2015 12:29:24 -0700
Subject: Drivers: hv: vmbus: Correcting truncation error for constant
 HV_CRASH_CTL_CRASH_NOTIFY

commit 5ef5b6927f14f29cacd78fa1fb861661a5367f13 upstream.

HV_CRASH_CTL_CRASH_NOTIFY is a 64 bit number.  Depending on the usage context,
the value may be truncated. This patch is in response from the following
email from Wu Fengguang <fengguang.wu at intel.com>:

    From: Wu Fengguang <fengguang.wu at intel.com>
    Subject:  [char-misc:char-misc-testing 25/45] drivers/hv/vmbus_drv.c:67:9: sparse:
              constant 0x8000000000000000 is so big it is unsigned long

    tree:   git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git char-misc-testing
    head:   b3de8e3719e582f3182bb504295e4a8e43c8c96f
    commit: 96c1d0581d00f7abe033350edb021a9d947d8d81 [25/45] Drivers: hv: vmbus: Add support for VMBus panic notifier handler
    reproduce:
      # apt-get install sparse
      git checkout 96c1d0581d00f7abe033350edb021a9d947d8d81
      make ARCH=x86_64 allmodconfig
      make C=1 CF=-D__CHECK_ENDIAN__

    sparse warnings: (new ones prefixed by >>)

    drivers/hv/vmbus_drv.c:67:9: sparse: constant 0x8000000000000000 is so big it is unsigned long
    ...

Signed-off-by: Nick Meier <nmeier at microsoft.com>
Reported-by: Wu Fengguang <fengguang.wu at intel.com>
Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: Joseph Salisbury <joseph.salisbury at canonical.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/hv/hyperv_vmbus.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 64318c0..ce49de7 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -58,7 +58,7 @@ enum hv_cpuid_function {
 #define HV_X64_MSR_CRASH_P4   0x40000104
 #define HV_X64_MSR_CRASH_CTL  0x40000105

-#define HV_CRASH_CTL_CRASH_NOTIFY 0x8000000000000000
+#define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63)

 /* Define version of the synthetic interrupt controller. */
 #define HV_SYNIC_VERSION		(1)
--
1.9.1