[PATCH 1/2] powerpc/vmlinux.lds: Ensure STRICT_ALIGN_SIZE is at least page aligned

[Michael Ellerman]

Christophe Leroy <christophe.leroy at csgroup.eu> writes:
> Le 16/09/2022 à 15:14, Michael Ellerman a écrit :
>> Add a check that STRICT_ALIGN_SIZE is aligned to at least PAGE_SIZE.
>
> This cannot happen, the definitions in arch/powerpc/Kconfig don't allow 
> that.

It can't happen yet :)

There's enough combinations of DATA_SHIFT and PAGE_SIZE that it would be
easy to add a new value for either and miss the implications. So I'd
rather have a check.

>> diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
>> index fe22d940412f..4e56fc0ee42a 100644
>> --- a/arch/powerpc/kernel/vmlinux.lds.S
>> +++ b/arch/powerpc/kernel/vmlinux.lds.S
>> @@ -32,6 +32,10 @@
>>   
>>   #define STRICT_ALIGN_SIZE	(1 << CONFIG_DATA_SHIFT)
>>   
>> +#if STRICT_ALIGN_SIZE < PAGE_SIZE
>> +#error "CONFIG_DATA_SHIFT must be >= PAGE_SIZE"
>
> s/PAGE_SIZE/PAGE_SHIFT

Thanks.

cheers