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Re: [PATCH v2 06/26] xen/riscv: implement make_cpus_node()
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 19 May 2026 15:42:10 +0200
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- Cc: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 19 May 2026 13:42:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.05.2026 15:33, Oleksii Kurochko wrote:
> On 5/18/26 6:00 PM, Jan Beulich wrote:
>> On 08.05.2026 16:43, Oleksii Kurochko wrote:
>>> + {
>>> + char buf[64];
>>> + uint32_t reg = cpu_to_fdt32(cpu);
>>
>> Isn't this a byte-order adjustment? If so, how come ...
>>
>>> + snprintf(buf, sizeof(buf), "cpu@%u", cpu);
>>
>> ... the result is passed to an entirely non-FDT function? (Most pre-existing
>> uses
>> of the function that I can spot store something in memory, i.e. adjusting
>> byte-
>> order makes sense there.)
>
> But here pure cpu is used instead of reg variable and reg variable is
> used here ...
>
>>
>>> + res = fdt_begin_node(fdt, buf);
>>> + if ( res )
>>> + return res;
>>> +
>>> + res = fdt_property(fdt, "reg", ®, sizeof(reg));
>>> + if ( res )
>>> + return res;
> ... but it we could drop it and use just:
> res = fdt_property_cell(fdt, "reg", cpu);
>
> fdt_property_cell will take care if a byte-order adjustment.
I'm sorry, I clearly must have seen something that wasn't really there.
Jan
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