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Re: [XEN PATCH 7/7] x86/xstate: move BUILD_BUG_ON to address MISRA C:2012 Rule 2.1
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 12 Dec 2023 11:04:30 +0100
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- Cc: consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 12 Dec 2023 10:04:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.12.2023 11:30, Nicola Vetrini wrote:
> The string literal inside the expansion of BUILD_BUG_ON is considered
> unreachable code; however, such statement can be moved earlier
> with no functional change.
First: Why is this deemed dead code in its present position, but okay when
moved? Second: While moving is indeed no functional change (really
BUILD_BUG_ON() can be moved about anywhere, for not producing any code in
the final binary), it removes the connection between it and the respective
asm() (where %z would have been nice to use).
Jan
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