linux-kernel - Re: [PATCH 4/9] Correcting truncation error for constant HV_CRASH_CTL_CRASH

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Message-ID: <20150318072702.GB27585@kroah.com>
Date:	Wed, 18 Mar 2015 08:27:02 +0100
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
	Nick Meier <nmeier@...rosoft.com>
Subject: Re: [PATCH 4/9] Correcting truncation error for constant
 HV_CRASH_CTL_CRASH_NOTIFY

On Tue, Mar 17, 2015 at 05:41:56PM -0700, K. Y. Srinivasan wrote:
> From: Nick Meier <nmeier@...rosoft.com>
> 
> 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 Intel:

"from Intel:" is really vague, please be nice and report who told you
about this problem.

> 
>     [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
>     ...
> 
> The current char-next branch is broken and this patch fixes
> the bug.
> 
> Signed-off-by: Nick Meier <nmeier@...rosoft.com>
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>

You forgot a "Reported-by:" here.
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