Message-ID: <CAOMZO5B6UVJ-dQ-RnzNAhu8-7H_u354rw8tRcpmZ3LWS4cDYFQ@mail.gmail.com>
Date:	Wed, 26 Mar 2014 13:22:47 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Kevin Hilman <khilman@...aro.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Boris BREZILLON <b.brezillon@...rkiz.com>,
	Mike Turquette <mturquette@...aro.org>,
	Jason Cooper <jason@...edaemon.net>,
	Arnd Bergmann <arnd@...db.de>,
	Tomasz Figa <tomasz.figa@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Olof Johansson <olof@...om.net>,
	Shawn Guo <shawn.guo@...aro.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH v3] clk: respect the clock dependencies in of_clk_init

Hi Gregory,

On Wed, Mar 26, 2014 at 1:02 PM, Gregory CLEMENT
<gregory.clement@...e-electrons.com> wrote:
> I don't have any imx6 board, but should it be possible for you or the imx6
> maintainer to add earlyprintk to see exactly what happen here?

Below is the log with earlyprintk enabled.

Regards,

Fabio Estevam

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Booting Linux on physical CPU 0x0
Linux version 3.14.0-rc8-next-20140326 (fabio@...io-Latitude-E6410)
(gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-1ubuntu1) ) #942 SMP Wed M
ar 26 13:20:56 BRT 2014
CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c5387d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine model: Wandboard i.MX6 Quad Board
bootconsole [earlycon0] enabled
Memory policy: Data cache writealloc
PERCPU: Embedded 8 pages/cpu @ee7a4000 s8960 r8192 d15616 u32768
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 520720
Kernel command line: console=ttymxc0,115200 root=/dev/nfs ip=dhcp
nfsroot=192.168.0.2:/tftpboot/rfs,v3,tcp earlyprintk
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 262144 (order: 8, 1048576 bytes)
Inode-cache hash table entries: 131072 (order: 7, 524288 bytes)
Memory: 2063904K/2097152K available (6455K kernel code, 402K rwdata,
2200K rodata, 320K init, 5513K bss, 33248K reserved, 270336K high
mem)
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    vmalloc : 0xf0000000 - 0xff000000   ( 240 MB)
    lowmem  : 0x80000000 - 0xef800000   (1784 MB)
    pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)
    modules : 0x7f000000 - 0x7fe00000   (  14 MB)
      .text : 0x80008000 - 0x8087bfdc   (8656 kB)
      .init : 0x8087c000 - 0x808cc300   ( 321 kB)
      .data : 0x808ce000 - 0x80932980   ( 403 kB)
       .bss : 0x80932988 - 0x80e950f8   (5514 kB)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Hierarchical RCU implementation.
NR_IRQS:16 nr_irqs:16 16
L310 cache controller enabled
l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x32070000, Cache size: 1024 kB
Switching to timer-based delay loop
Division by zero in kernel.
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc8-next-20140326 #942
Backtrace:
[<80011cd4>] (dump_backtrace) from [<80011e70>] (show_stack+0x18/0x1c)
 r6:00000000 r5:00000000 r4:00000000 r3:00000000
[<80011e58>] (show_stack) from [<8064cc60>] (dump_stack+0x88/0xa4)
[<8064cbd8>] (dump_stack) from [<80011a94>] (__div0+0x18/0x20)
 r5:00000000 r4:00000000
[<80011a7c>] (__div0) from [<8029582c>] (Ldiv0_64+0x8/0x18)
[<8007e854>] (clocks_calc_mult_shift) from [<8089a8d0>]
(sched_clock_register+0x60/0x238)
 r10:f0018074 r9:00000000 r8:80020ba0 r7:00000020 r6:00000000 r5:80932eac
 r4:00000000
[<8089a870>] (sched_clock_register) from [<80884588>]
(mxc_timer_init+0xf8/0x190)
 r10:f0018074 r9:00000000 r8:00000057 r7:f0020024 r6:ee022b80 r5:80932eac
 r4:00000000
[<80884490>] (mxc_timer_init) from [<808910b0>]
(imx6q_clocks_init+0x2c00/0x2d24)
 r8:00000004 r7:809334d0 r6:808c7310 r5:ee7ccbe8 r4:f0020000
[<8088e4b0>] (imx6q_clocks_init) from [<808b024c>] (of_clk_init+0xd8/0x198)
 r10:80923594 r9:809234d4 r8:00000000 r7:ee002ac0 r6:ee002b00 r5:ee7ce5b0
 r4:00000001
[<808b0174>] (of_clk_init) from [<80880364>] (time_init+0x2c/0x38)
 r10:ef7fc9c0 r9:412fc09a r8:808d6880 r7:808bd790 r6:ffffffff r5:809329c0
 r4:00000001
[<80880338>] (time_init) from [<8087ca2c>] (start_kernel+0x1f8/0x388)
[<8087c834>] (start_kernel) from [<10008074>] (0x10008074)
 r10:00000000 r8:1000406a r7:808db644 r6:808bd78c r5:808d692c r4:10c5387d
sched_clock: 32 bits at 0 Hz, resolution 0ns, wraps every 0ns
Division by zero in kernel.
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc8-next-20140326 #942
Backtrace:
[<80011cd4>] (dump_backtrace) from [<80011e70>] (show_stack+0x18/0x1c)
 r6:ee011a00 r5:00000000 r4:00000000 r3:00000000
[<80011e58>] (show_stack) from [<8064cc60>] (dump_stack+0x88/0xa4)
[<8064cbd8>] (dump_stack) from [<80011a94>] (__div0+0x18/0x20)
 r5:00000000 r4:00000000
[<80011a7c>] (__div0) from [<8029582c>] (Ldiv0_64+0x8/0x18)
[<8007ea84>] (__clocksource_updatefreq_scale) from [<8007ec3c>]
(__clocksource_register_scale+0x14/0x54)
 r10:000000c8 r9:00000000 r8:f0020024 r7:807b3e58 r6:ee0119c0 r5:00000000
 r4:ee011a00
[<8007ec28>] (__clocksource_register_scale) from [<808ae6f8>]
(clocksource_mmio_init+0x8c/0xa8)
 r4:ffffffff r3:00000001
[<808ae66c>] (clocksource_mmio_init) from [<808845ac>]
(mxc_timer_init+0x11c/0x190)
 r10:f0018074 r8:00000057 r7:f0020024 r6:ee022b80 r5:80932eac r4:808dc900
[<80884490>] (mxc_timer_init) from [<808910b0>]
(imx6q_clocks_init+0x2c00/0x2d24)
 r8:00000004 r7:809334d0 r6:808c7310 r5:ee7ccbe8 r4:f0020000
[<8088e4b0>] (imx6q_clocks_init) from [<808b024c>] (of_clk_init+0xd8/0x198)
 r10:80923594 r9:809234d4 r8:00000000 r7:ee002ac0 r6:ee002b00 r5:ee7ce5b0
 r4:00000001
[<808b0174>] (of_clk_init) from [<80880364>] (time_init+0x2c/0x38)
 r10:ef7fc9c0 r9:412fc09a r8:808d6880 r7:808bd790 r6:ffffffff r5:809329c0
 r4:00000001
[<80880338>] (time_init) from [<8087ca2c>] (start_kernel+0x1f8/0x388)
[<8087c834>] (start_kernel) from [<10008074>] (0x10008074)
 r10:00000000 r8:1000406a r7:808db644 r6:808bd78c r5:808d692c r4:10c5387d
Division by zero in kernel.
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc8-next-20140326 #942
Backtrace:
[<80011cd4>] (dump_backtrace) from [<80011e70>] (show_stack+0x18/0x1c)
 r6:ee011a00 r5:00000000 r4:00000000 r3:00000000
[<80011e58>] (show_stack) from [<8064cc60>] (dump_stack+0x88/0xa4)
[<8064cbd8>] (dump_stack) from [<80011a94>] (__div0+0x18/0x20)
 r5:00000000 r4:00000000
[<80011a7c>] (__div0) from [<8029582c>] (Ldiv0_64+0x8/0x18)
[<8007e854>] (clocks_calc_mult_shift) from [<8007eb28>]
(__clocksource_updatefreq_scale+0xa4/0x1a4)
 r10:00000001 r9:a3d70a3d r8:70a3d70a r7:0000000b r6:ee011a00 r5:00000001
 r4:00000001
[<8007ea84>] (__clocksource_updatefreq_scale) from [<8007ec3c>]
(__clocksource_register_scale+0x14/0x54)
 r10:000000c8 r9:00000000 r8:f0020024 r7:807b3e58 r6:ee0119c0 r5:00000000
 r4:ee011a00
[<8007ec28>] (__clocksource_register_scale) from [<808ae6f8>]
(clocksource_mmio_init+0x8c/0xa8)
 r4:ffffffff r3:00000001
[<808ae66c>] (clocksource_mmio_init) from [<808845ac>]
(mxc_timer_init+0x11c/0x190)
 r10:f0018074 r8:00000057 r7:f0020024 r6:ee022b80 r5:80932eac r4:808dc900
[<80884490>] (mxc_timer_init) from [<808910b0>]
(imx6q_clocks_init+0x2c00/0x2d24)
 r8:00000004 r7:809334d0 r6:808c7310 r5:ee7ccbe8 r4:f0020000
[<8088e4b0>] (imx6q_clocks_init) from [<808b024c>] (of_clk_init+0xd8/0x198)
 r10:80923594 r9:809234d4 r8:00000000 r7:ee002ac0 r6:ee002b00 r5:ee7ce5b0
 r4:00000001
[<808b0174>] (of_clk_init) from [<80880364>] (time_init+0x2c/0x38)
 r10:ef7fc9c0 r9:412fc09a r8:808d6880 r7:808bd790 r6:ffffffff r5:809329c0
 r4:00000001
[<80880338>] (time_init) from [<8087ca2c>] (start_kernel+0x1f8/0x388)
[<8087c834>] (start_kernel) from [<10008074>] (0x10008074)
 r10:00000000 r8:1000406a r7:808db644 r6:808bd78c r5:808d692c r4:10c5387d
Division by zero in kernel.
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc8-next-20140326 #942
Backtrace:
[<80011cd4>] (dump_backtrace) from [<80011e70>] (show_stack+0x18/0x1c)
 r6:ee022b80 r5:00000000 r4:00000000 r3:00000000
[<80011e58>] (show_stack) from [<8064cc60>] (dump_stack+0x88/0xa4)
[<8064cbd8>] (dump_stack) from [<80011a94>] (__div0+0x18/0x20)
 r5:808dc900 r4:00000000
[<80011a7c>] (__div0) from [<8029582c>] (Ldiv0_64+0x8/0x18)
[<80082314>] (clockevents_config) from [<800823b4>]
(clockevents_config_and_register+0x1c/0x28)
 r5:80932eac r4:808dc900
[<80082398>] (clockevents_config_and_register) from [<808845d8>]
(mxc_timer_init+0x148/0x190)
 r4:808dc900 r3:fffffffe
[<80884490>] (mxc_timer_init) from [<808910b0>]
(imx6q_clocks_init+0x2c00/0x2d24)
 r8:00000004 r7:809334d0 r6:808c7310 r5:ee7ccbe8 r4:f0020000
[<8088e4b0>] (imx6q_clocks_init) from [<808b024c>] (of_clk_init+0xd8/0x198)
 r10:80923594 r9:809234d4 r8:00000000 r7:ee002ac0 r6:ee002b00 r5:ee7ce5b0
 r4:00000001
[<808b0174>] (of_clk_init) from [<80880364>] (time_init+0x2c/0x38)
 r10:ef7fc9c0 r9:412fc09a r8:808d6880 r7:808bd790 r6:ffffffff r5:809329c0
 r4:00000001
[<80880338>] (time_init) from [<8087ca2c>] (start_kernel+0x1f8/0x388)
[<8087c834>] (start_kernel) from [<10008074>] (0x10008074)
 r10:00000000 r8:1000406a r7:808db644 r6:808bd78c r5:808d692c r4:10c5387d
------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at kernel/time/clockevents.c:44 cev_delta2ns+0xe8/0x104()
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc8-next-20140326 #942
Backtrace:
[<80011cd4>] (dump_backtrace) from [<80011e70>] (show_stack+0x18/0x1c)
 r6:80081cb8 r5:00000000 r4:00000000 r3:00000000
[<80011e58>] (show_stack) from [<8064cc60>] (dump_stack+0x88/0xa4)
[<8064cbd8>] (dump_stack) from [<80028f78>] (warn_slowpath_common+0x70/0x94)
 r5:00000009 r4:00000000
[<80028f08>] (warn_slowpath_common) from [<80028fc0>]
(warn_slowpath_null+0x24/0x2c)
 r8:000000ff r7:000000ff r6:00000000 r5:808dc900 r4:00000000
[<80028f9c>] (warn_slowpath_null) from [<80081cb8>] (cev_delta2ns+0xe8/0x104)
[<80081bd0>] (cev_delta2ns) from [<80082374>] (clockevents_config+0x60/0x84)
 r9:00000000 r8:00000057 r7:f0020024 r6:ee022b80 r5:808dc900 r4:00000000
[<80082314>] (clockevents_config) from [<800823b4>]
(clockevents_config_and_register+0x1c/0x28)
 r5:80932eac r4:808dc900
[<80082398>] (clockevents_config_and_register) from [<808845d8>]
(mxc_timer_init+0x148/0x190)
 r4:808dc900 r3:fffffffe
[<80884490>] (mxc_timer_init) from [<808910b0>]
(imx6q_clocks_init+0x2c00/0x2d24)
 r8:00000004 r7:809334d0 r6:808c7310 r5:ee7ccbe8 r4:f0020000
[<8088e4b0>] (imx6q_clocks_init) from [<808b024c>] (of_clk_init+0xd8/0x198)
 r10:80923594 r9:809234d4 r8:00000000 r7:ee002ac0 r6:ee002b00 r5:ee7ce5b0
 r4:00000001
[<808b0174>] (of_clk_init) from [<80880364>] (time_init+0x2c/0x38)
 r10:ef7fc9c0 r9:412fc09a r8:808d6880 r7:808bd790 r6:ffffffff r5:809329c0
 r4:00000001
[<80880338>] (time_init) from [<8087ca2c>] (start_kernel+0x1f8/0x388)
[<8087c834>] (start_kernel) from [<10008074>] (0x10008074)
 r10:00000000 r8:1000406a r7:808db644 r6:808bd78c r5:808d692c r4:10c5387d
---[ end trace 3406ff24bd97382e ]---
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