[PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP_STACK

[Christophe Leroy]

Le 17/10/2019 à 09:36, Andrew Donnellan a écrit :
> On 10/9/19 7:16 pm, Christophe Leroy wrote:
>> +#if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT
>> +#define THREAD_SHIFT        PAGE_SHIFT
>> +#else
>>   #define THREAD_SHIFT        CONFIG_THREAD_SHIFT
>> +#endif
>>
>>   #define THREAD_SIZE        (1 << THREAD_SHIFT)
>>
> 
> Looking at 64-bit book3s: with 64K pages, this results in a THREAD_SIZE 
> that's too large for immediate mode arithmetic operations, which is 
> annoying. Hmm.
> 

Which operation are you thinking about ?

For instance, 'addi' can't be used anymore, but 'addis' can.

Christophe