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Re: [PATCH] x86/domctl: Conditionalise x86 domctl using DCE rather than ifdef
- To: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 10 Feb 2026 16:39:20 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 10 Feb 2026 15:39:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.02.2026 16:10, Alejandro Vallejo wrote:
> @@ -1033,11 +1035,13 @@ long arch_do_domctl(
> break;
> }
>
> -#ifdef CONFIG_MEM_SHARING
> case XEN_DOMCTL_mem_sharing_op:
> + ret = -EOPNOTSUPP;
> + if ( !IS_ENABLED(CONFIG_MEM_SHARING) )
> + break;
> +
> ret = mem_sharing_domctl(d, &domctl->u.mem_sharing_op);
> break;
> -#endif
>
> #if P2M_AUDIT
> case XEN_DOMCTL_audit_p2m:
What about this #if, though?
> --- a/xen/arch/x86/include/asm/mem_sharing.h
> +++ b/xen/arch/x86/include/asm/mem_sharing.h
> @@ -9,8 +9,13 @@
> #ifndef __MEM_SHARING_H__
> #define __MEM_SHARING_H__
>
> -#include <public/domctl.h>
> -#include <public/memory.h>
> +#include <xen/sched.h>
As it looks this is for mem_sharing_is_fork(). Can this then please move ...
> +struct xen_domctl_mem_sharing_op;
> +struct xen_mem_sharing_op;
> +
> +int mem_sharing_domctl(struct domain *d,
> + struct xen_domctl_mem_sharing_op *mec);
>
> #ifdef CONFIG_MEM_SHARING
... inside this #ifdef? The mem_sharing_domctl() decl may then want moving to
the bottom of the file. Otoh I wonder whether supplying a stub wouldn't be
neater for the single use site.
Jan
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