From: Benjamin Herrenschmidt <benh@au1.ibm.com>
To: Christophe Leroy <christophe.leroy@c-s.fr>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: Does SMP work at all on 40x ?
Date: Fri, 01 Feb 2019 18:42:50 +1100 [thread overview]
Message-ID: <d4933d50eb6d79b6c725050a02b6b58ad81667fc.camel@au1.ibm.com> (raw)
In-Reply-To: <5c170dab-4f0b-8be2-e99a-9afd0fa02394@c-s.fr>
On Wed, 2019-01-30 at 08:16 +0100, Christophe Leroy wrote:
> 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
There is no 40x SMP that I am aware of.
Cheers,
Ben.
prev parent reply other threads:[~2019-02-01 7:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 7:16 Does SMP work at all on 40x ? Christophe Leroy
2019-01-30 11:43 ` Michael Ellerman
2019-01-31 10:53 ` Christophe Leroy
2019-02-01 7:42 ` Benjamin Herrenschmidt [this message]
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