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Re: [PATCH] xen: fix multicall debug data referencing
- To: Juergen Gross <jgross@xxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- From: boris.ostrovsky@xxxxxxxxxx
- Date: Thu, 18 Jul 2024 17:56:49 -0400
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- Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, kernel test robot <lkp@xxxxxxxxx>
- Delivery-date: Thu, 18 Jul 2024 21:57:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 7/18/24 2:21 AM, Juergen Gross wrote:
The recent adding of multicall debug mixed up the referencing of
the debug data. A __percpu tagged pointer can't be initialized with a
plain pointer, so use another percpu variable for the pointer and set
it on each new cpu via a function.
Fixes: 942d917cb92a ("xen: make multicall debug boot time selectable")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes:
https://lore.kernel.org/oe-kbuild-all/202407151106.5s7Mnfpz-lkp@xxxxxxxxx/
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
IIUIC we only need data until SMP is initialized, so setting per-cpu
pointer just on cpu0 may be sufficient. Not sure where to do this though.
But this works as well.
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
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