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Re: linux-6.15-rc2/drivers/xen/balloon.c:346: Possible int/long mixup
- To: David Binderman <dcb314@xxxxxxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, "oleksandr_tyshchenko@xxxxxxxx" <oleksandr_tyshchenko@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Tue, 15 Apr 2025 08:55:38 +0200
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- Delivery-date: Tue, 15 Apr 2025 06:55:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.04.25 19:57, David Binderman wrote:
Hello there,
Static analyser cppcheck says:
linux-6.15-rc2/drivers/xen/balloon.c:346:24: style: int result is assigned to
long variable. If the variable is long to avoid loss of information, then you
have loss of information. [truncLongCastAssignment]
Source code is
unsigned long i, size = (1 << order);
Maybe better code:
unsigned long i, size = (1UL << order);
While I agree this would be better, there is no real failure possible
here. For this to cause problems you'd need to hotplug 16TB of memory
in one single block.
Nevertheless thanks for the notice.
Juergen
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