linux-kernel - Re: 174cc7187e6f ACPICA: Tables: Back port acpi_get_table_with_size() and early_acpi_os_unmap

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Date:   Tue, 10 Jan 2017 00:52:11 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     "Zheng, Lv" <lv.zheng@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "Moore, Robert" <robert.moore@...el.com>,
        J?rg R?del <joro@...tes.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>
Subject: Re: 174cc7187e6f ACPICA: Tables: Back port
 acpi_get_table_with_size() and early_acpi_os_unmap_memory() from Linux
 kernel

On Tue, Jan 10, 2017 at 12:40:39AM +0100, Borislav Petkov wrote:
> Lemme run it.

Well, it boots but I get:

[    0.291447] ------------[ cut here ]------------
[    0.291702] WARNING: CPU: 0 PID: 1 at kernel/rcu/tree.c:3993 rcu_scheduler_starting+0x5c/0x70
[    0.292107] Modules linked in:
[    0.292277] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.10.0-rc3+ #21
[    0.292540] Hardware name: HP HP EliteBook 745 G3/807E, BIOS N73 Ver. 01.08 01/28/2016
[    0.292893] Call Trace:
[    0.293072]  ? dump_stack+0x46/0x63
[    0.293285]  ? __warn+0xec/0x110
[    0.293487]  ? rcu_scheduler_starting+0x5c/0x70
[    0.293735]  ? kernel_init_freeable+0x58/0x19a
[    0.293976]  ? rest_init+0x80/0x80
[    0.294153]  ? kernel_init+0xa/0x100
[    0.294334]  ? ret_from_fork+0x22/0x30
[    0.294525] ---[ end trace 4c0fe009ed4dc740 ]---

TBH, I like Rafael's suggestion in the other mail to stick with fixing
this in ACPI, especially this is an ACPI problem, not RCU. Well,
more or less: RCU could be taught to *not* do schedule_work() if
workqueue_init() hasn't happened yet but that's a tangential.

So, I'm going to bed. When I wake up, I want to see working fixes!

:-)))

Thanks dudes!

-- 
Regards/Gruss,
    Boris.

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