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To: Paul Mackerras <paulus@samba.org>,
 Benjamin Herrenschmidt <benh@au1.ibm.com>,
 Michael Ellerman <mpe@ellerman.id.au>,
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From: Christophe Leroy <christophe.leroy@c-s.fr>
Subject: Does SMP work at all on 40x ?
Message-ID: <5c170dab-4f0b-8be2-e99a-9afd0fa02394@c-s.fr>
Date: Wed, 30 Jan 2019 08:16:36 +0100
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

In transfer_to_handler() (entry_32.S), we have:

#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
...
#ifdef CONFIG_SMP
	CURRENT_THREAD_INFO(r9, r1)
	lwz	r9,TI_CPU(r9)
	slwi	r9,r9,3
	add	r11,r11,r9
#endif
#endif

When running this piece of code, MMU translation is off. But r9 contains 
the virtual addr of current_thread_info, so unless I miss something, 
this cannot work on the 40x, can it ?

On CONFIG_BOOKE it works because phys addr = virt addr

Christophe