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Subject: Re: [PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP_STACK
To: Andrew Donnellan <ajd@linux.ibm.com>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>,
 npiggin@gmail.com, dja@axtens.net
References: <cover.1568106758.git.christophe.leroy@c-s.fr>
 <7e9771a56539c58dcd8a871c3dfbe7a932e427b0.1568106758.git.christophe.leroy@c-s.fr>
 <d181b762-3e7b-7a0a-2505-54ead241456d@linux.ibm.com>
From: Christophe Leroy <christophe.leroy@c-s.fr>
Message-ID: <baff8ef3-a3c6-c6e2-732f-4d521d92140b@c-s.fr>
Date: Fri, 18 Oct 2019 08:46:35 +0200
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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