Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Christophe Leroy <christophe.leroy@c-s.fr>
Subject: [Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't boot
 anymore
To:     Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Li Yang <leoyang.li@nxp.com>, Qiang Zhao <qiang.zhao@nxp.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
        Scott Wood <oss@buserror.net>,
        linux-arm-kernel@lists.infradead.org,
        LKML <linux-kernel@vger.kernel.org>
Message-ID: <0d45fa64-51ee-0052-cb34-58c770c5b3ce@c-s.fr>
Date:   Wed, 12 Feb 2020 14:24:36 +0000
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.7.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Rasmus,

Kernel 5.6-rc1 silently fails on boot.

I bisected the problem to commit b6231ea2b3c6 ("soc: fsl: qe: drop 
broken lazy call of cpm_muram_init()")

I get a bad_page_fault() for an access at address 8 in 
cpm_muram_alloc_common(), called from cpm_uart_console_setup() via 
cpm_uart_allocbuf()

Reverting the guilty commit on top of 5.6-rc1 is not trivial.

In your commit text you explain that cpm_muram_init() is called via 
subsys_initcall. But console init is done before that, so it cannot work.

Do you have a fix for that ?

Thanks
Christophe

NB: Next time, can you please copy powerpc mailing list when changing 
such core parts of powerpc CPUs ?