Re: linux-next: Tree for Aug 31 (new arm, arm64, s390 failures)

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Hi Marc,

On 08/31/2015 11:26 AM, Marc Zyngier wrote:
[ ... ]

Actually, the kernel dies because of this:

commit adaac459759db4a1fd35baddbe47bac700095496
Author: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
Date:   Sun Aug 30 09:33:53 2015 +0200

     regmap: Introduce max_raw_read/write for regmap_bulk_read/write

     There are some buses which have a limit on the maximum number of
     bytes that can be send/received. An example for this is
     I2C_FUNC_SMBUS_I2C_BLOCK which does not support any reads/writes of
     more than 32 bytes. The regmap_bulk operations should still be able
     to utilize the full 32 bytes in this case.

     Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
     Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>

which never considers bus to be NULL in __regmap_init. With the
following patch applied, I can boot to a prompt:

 From 031eae5a1b34f952ba3dcaecb4eb4ec9d3bda352 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@xxxxxxx>
Date: Mon, 31 Aug 2015 19:16:16 +0100
Subject: [PATCH] regmap: Fix max_raw_read/write handling when bus is NULL

Commit adaac459759d ("regmap: Introduce max_raw_read/write
for regmap_bulk_read/write") added new fields to regmap_bus
and started using them in __regmap_init, but failed to
consider the case where bus would be NULL, like in the
vexpress-syscgf case. The box (actually its qemu version)
ends up dying painfully.

Fix it by testing bus before doing anything else.

Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>

Yes, that fixes the vexpress failures.

Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>

However, I still need to revert your patches to get my realview-pb-a8
and realview-eb tests to work again.

I am a bit concerned about the use of of_address_to_resource(),
which can return an error, leaving cpu_res undefined. Also, if
both CONFIG_OF and CONFIG_ACPI are not configured, supports_deactivate
is set to true by default. This is the configuration used in my
failing tests.

With that in mind, I ran a simple test.

-static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
+static struct static_key supports_deactivate = STATIC_KEY_INIT_FALSE;

Bingo, problem solved. Can you try to find a clean solution ?

I wonder how it comes that you get a console output from qemu, but I don't.
Did you use multi_v7_defconfig or some other configuration ?

Thanks,
Guenter

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