arm32 insecure W+X mapping

[Russell King (Oracle)]

On Wed, Sep 15, 2021 at 06:44:56AM -0300, Fabio Estevam wrote:
> Not sure if this is related or not to the following behavior that I am seeing.
> 
> On 5.15-rc1 I see the following on an imx6dl based board:
> 
> [    0.123336] imx6q_suspend_init: failed to find ocram device!

Looking at the platforms I currently have, two imx6q which booted 5.13
do not have this problem, but one imx6dl that booted 5.14 does seem to
spit out this message.

What I do notice is that in the 5.14 case, /proc/iomem reports that the
ocram device does exist:

00900000-0091ffff : 900000.sram sram at 900000

so I'm suspecting an init ordering issue.

It looks on the face of it to be a regression between 5.13 and 5.14.
I'm guessing that the sram device isn't being probed early enough.
Maybe some of the initialisation/device model debug options can
identify what changed?

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