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Re: [PATCH v5 11/13] xen/spinlock: support higher number of cpus
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 18 Mar 2024 16:08:13 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 18 Mar 2024 15:08:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.03.2024 08:20, Juergen Gross wrote:
> --- a/xen/include/xen/spinlock.h
> +++ b/xen/include/xen/spinlock.h
> @@ -8,16 +8,16 @@
> #include <asm/system.h>
> #include <asm/spinlock.h>
>
> -#define SPINLOCK_CPU_BITS 12
> +#define SPINLOCK_CPU_BITS 16
>
> #ifdef CONFIG_DEBUG_LOCKS
> union lock_debug {
> - uint16_t val;
> -#define LOCK_DEBUG_INITVAL 0xffff
> + uint32_t val;
> +#define LOCK_DEBUG_INITVAL 0xffffffff
With this #define I can see the desire for using a fixed width type for "val".
However, ...
> struct {
> - uint16_t cpu:SPINLOCK_CPU_BITS;
> -#define LOCK_DEBUG_PAD_BITS (14 - SPINLOCK_CPU_BITS)
> - uint16_t :LOCK_DEBUG_PAD_BITS;
> + uint32_t cpu:SPINLOCK_CPU_BITS;
> +#define LOCK_DEBUG_PAD_BITS (30 - SPINLOCK_CPU_BITS)
> + uint32_t :LOCK_DEBUG_PAD_BITS;
.. "unsigned int" ought to be fine for both of these.
Jan
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