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 00:44:58 +0000
From:   "Zheng, Lv" <lv.zheng@...el.com>
To:     Borislav Petkov <bp@...en8.de>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC:     "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

Hi,

Can the attached patch makes something different?

Thanks and best regards
Lv

> From: Borislav Petkov [mailto:bp@...en8.de]
> 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.
> 
> Good mailing practices for 400: avoid top-posting and trim the reply.

Download attachment "lv-rcu1.patch" of type "application/octet-stream" (1259 bytes)