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