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Re: [PATCH v4] core-parking: fix build with gcc12 and NR_CPUS=1
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 13 Mar 2023 13:36:53 +0000
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- Cc: George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28/02/2023 12:34 pm, Jan Beulich wrote:
> Gcc12 takes issue with core_parking_remove()'s
>
> for ( ; i < cur_idle_nums; ++i )
> core_parking_cpunum[i] = core_parking_cpunum[i + 1];
>
> complaining that the right hand side array access is past the bounds of
> 1. Clearly the compiler can't know that cur_idle_nums can only ever be
> zero in this case (as the sole CPU cannot be parked).
>
> Arrange for core_parking.c's contents to not be needed altogether, and
> then disable its building when NR_CPUS == 1.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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