linux-kernel - [Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't boot anymore

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Date:   Wed, 12 Feb 2020 14:24:36 +0000
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Li Yang <leoyang.li@....com>, Qiang Zhao <qiang.zhao@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Scott Wood <oss@...error.net>,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: [Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't boot
 anymore

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 ?