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

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