Re: [PATCH 1/4] rust: sizes: add SZ_4G constant

[Alvin Sun <alvin.sun@linux.dev>]

On 4/20/26 23:15, Gary Guo wrote:
> On Fri Apr 17, 2026 at 2:05 AM BST, Alvin Sun wrote:
>> Add SZ_4G constant defined as SZ_2G * 2. This constant will be used by
>> the Tyr driver for calculating user and kernel VA layout.
>>
>> Signed-off-by: Alvin Sun <alvin.sun@linux.dev>
>> ---
>>   rust/kernel/sizes.rs | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/rust/kernel/sizes.rs b/rust/kernel/sizes.rs
>> index 661e680d93306..872f5bb181ecf 100644
>> --- a/rust/kernel/sizes.rs
>> +++ b/rust/kernel/sizes.rs
>> @@ -48,3 +48,5 @@
>>   pub const SZ_1G: usize = bindings::SZ_1G as usize;
>>   /// 0x80000000
>>   pub const SZ_2G: usize = bindings::SZ_2G as usize;
>> +/// 0x100000000
>> +pub const SZ_4G: usize = SZ_2G * 2;
> How is this supposed to work with 32-bit arch?

Thank you for pointing out these issues! I didn't properly consider
word size differences across architectures and wasn't sensitive enough
to using `usize` appropriately.

I'll fix both issues in the next version of the patchset.

Best regards,
Alvin Sun

>
> Best,
> Gary