linux-kernel - Re: [PATCH] soc: fsl/qe: fix Oops on CPM1 (and likely CPM2)

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Message-ID: <1470958199.25630.266.camel@buserror.net>
Date:	Thu, 11 Aug 2016 18:29:59 -0500
From:	Scott Wood <oss@...error.net>
To:	Christophe Leroy <christophe.leroy@....fr>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Zhao Qiang <qiang.zhao@....com>,
	"David S.Miller" <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] soc: fsl/qe: fix Oops on CPM1 (and likely CPM2)

On Mon, 2016-08-08 at 18:08 +0200, Christophe Leroy wrote:
> Commit 0e6e01ff694ee ("CPM/QE: use genalloc to manage CPM/QE muram")
> has changed the way muram is managed.
> genalloc uses kmalloc(), hence requires the SLAB to be up and running.
> 
> On powerpc 8xx, cpm_reset() is called early during startup.
> cpm_reset() then calls cpm_muram_init() before SLAB is available,
> hence the following Oops.
> 
> cpm_reset() cannot be called during initcalls because the CPM is
> needed for console
> 
> This patch splits cpm_muram_init() in two parts. The first part,
> related to mappings, is kept as cpm_muram_init()
> The second part is named cpm_muram_pool_init() and is called
> the first time cpm_muram_alloc() is used

Why do you need to split it, versus calling the full cpm_muram_init() on
demand?

-Scott