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Re: [PATCH 06/14] Arm/alternative: hide casting away of const
- To: "Orzel, Michal" <michal.orzel@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 2 Sep 2026 14:35:34 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 02 Sep 2026 12:35:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.09.2026 13:47, Orzel, Michal wrote:
> On 02-Sep-26 08:32, Jan Beulich wrote:
>> We want to patch the original call site, which memory-wise is unrelated
>> to the struct alt_instr * that we start from.
>>
>> No functional change intended.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>
>> --- a/xen/arch/arm/alternative.c
>> +++ b/xen/arch/arm/alternative.c
>> @@ -134,7 +134,7 @@ static int __apply_alternatives(const st
>> BUG_ON(alt->repl_len != alt->orig_len);
>>
>> origptr = ALT_ORIG_PTR(alt);
>> - updptr = (void *)origptr + update_offset;
>> + updptr = (void *)(long)origptr + update_offset;
> NIT: Why long and not unsigned long like other places in this file?
Hmm, that was inherited from "x86/altcall: hide casting away of const",
yet apparently wrongly so: update_offset is of unsigned type here. I've
switched locally.
> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
Thanks.
Jan
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