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Re: [PATCH v3 2/6] x86: extend update_intpte() to support atomic get-and-update
- To: Kevin Lampis <kevin.lampis@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 12 Oct 2026 13:16:44 +0200
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- Cc: andrew.cooper3@xxxxxxxxxx, teddy.astie@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 12 Oct 2026 11:16:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.10.2026 19:47, Kevin Lampis wrote:
> @@ -95,17 +102,26 @@ static inline void update_intpte(intpte_t *p, intpte_t
> old, intpte_t new,
> old = t;
> }
> }
> + return old;
> }
>
> /*
> * Macro that wraps the appropriate type-changes around update_intpte().
> * Arguments are: type, ptr, old, new, mfn, vcpu
> */
> -#define UPDATE_ENTRY(_t ,_p ,_o ,_n ,_m ,_v , fl) \
> - update_intpte(&_t ## e_get_intpte(*(_p)), \
> - _t ## e_get_intpte(_o), _t ## e_get_intpte(_n), \
> +#define UPDATE_ENTRY(_t ,_p ,_o ,_n ,_m ,_v , fl) \
> + update_intpte(&_t ## e_get_intpte(*(_p)), \
> + _t ## e_get_intpte(_o), _t ## e_get_intpte(_n), \
> _m, _v, fl)
If I'm not mistaken, nothing changes here except for the placement of the
backslashes. Can such unnecessary churn please be avoided?
Jan
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