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Re: [PATCH v2] xen/dt: Remove loop in dt_read_number()
- To: Alejandro Vallejo <agarciav@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 18 Jun 2025 08:37:54 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 18 Jun 2025 06:38:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.06.2025 19:13, Alejandro Vallejo wrote:
> --- a/xen/include/xen/device_tree.h
> +++ b/xen/include/xen/device_tree.h
> @@ -261,10 +261,21 @@ void intc_dt_preinit(void);
> /* Helper to read a big number; size is in cells (not bytes) */
> static inline u64 dt_read_number(const __be32 *cell, int size)
> {
> - u64 r = 0;
> + u64 r = be32_to_cpu(*cell);
> +
> + switch ( size )
> + {
> + case 1:
> + break;
> + case 2:
> + r = (r << 32) | be32_to_cpu(cell[1]);
> + break;
> + default:
> + // Nonsensical size. default to 1.
> + printk(XENLOG_WARNING "dt_read_number(%d) bad size\n", size);
Might be good to entirely unambiguously indicate it's the 2nd argument.
Iirc an approach we use elsewhere is to spell it dt_read_number(,%d).
Jan
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