[meta-freescale] linux-imx-3.10.9 with preempt-rt patch

[Jacob Kroon]

Hi,

So with this mail I hope I can start get the ball rolling with enabling the
Freescale kernel to build with the PREEMPT RT patch.
What I have sofar is Freescales 3.10.9 kernel + official 3.10.9-rt-patch
(See [1]) + minor fixes. I also had to set NR_CPUS to be less than the
default 4 in the default kernel config, otherwise I ran into some spin lock
NULL pointer dereferences in the Vivante physical-to-virtual memory
location conversion.

The attached patch was necessary in order to get the Vivante GPU kernel
driver to build.

I'm using a Wandboard Solo + an Qt5.2 QtQuick application.
While ping-flooing the Solo and running hackbench on the target, cyclictest
gives me an average of ~30 us, ~150 us max latency.

However, occasionally I get a kernel oops, and need to restart the board.
Oops mesage is also attached.

  -- Jacob

[1]
https://www.kernel.org/pub/linux/kernel/projects/rt/3.10/older/patch-3.10.9-rt5.patch.xz
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Unable to handle kernel NULL pointer dereference at virtual address 0000004f
pgd = 8c5e0000
[0000004f] *pgd=1c489831, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 354 Comm: QSGRenderThread Not tainted 3.10.9-rt5-monkey+gdbf364b #1
task: 8c7ce400 ti: 8c516000 task.ti: 8c516000
PC is at gckCOMMAND_Commit+0x210/0xa44
LR is at 0x139f8
pc : [<804f4c64>]    lr : [<000139f8>]    psr: 800f0013
sp : 8c517c18  ip : 90043000  fp : 8c517d94
r10: 68668038  r9 : ffffffff  r8 : 8c517c70
r7 : 00000000  r6 : 68621f08  r5 : 00000000  r4 : 8c23ee40
r3 : 8c4a6380  r2 : 000008b8  r1 : 00000000  r0 : 00000000
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 10c53c7d  Table: 1c5e004a  DAC: 00000015
Process QSGRenderThread (pid: 354, stack limit = 0x8c516238)
Stack: (0x8c517c18 to 0x8c518000)
7c00:                                                       00000000 00000000
7c20: 8c517c54 8c517c30 20043000 90043000 00000748 000000b8 00001000 68ce5948
7c40: 8c23ed80 8c517c50 807076e4 00000001 20193948 00000008 00000020 00000008
7c60: 00000010 8cf09680 813b52c0 00000000 42444d43 00000000 00000000 00000000
7c80: 00000000 00000000 00000000 00000009 68cd2000 00000000 00020000 00013948
7ca0: 000139f8 0000c5f8 68ce59e8 00000000 000139e8 00000000 00000000 8c516020
7cc0: 00000057 00000000 f4000100 00000001 8c517cf4 8c517ce0 80032134 800923d8
7ce0: 8c517d04 8c517cf0 8005af64 8007aad4 40000000 8c516000 600f0013 ffffffff
7d00: 8c517d6c 8000e4e0 8c516000 807063a0 8c517d34 8c517d20 807063a0 80059e14
7d20: 00000010 804f3020 8c517d94 8c517d38 8000e50c 80706354 00000000 00000000
7d40: 00000000 8c036000 00000000 8c1d4900 8c23ee40 00000000 00000001 682b2ac8
7d60: 00000000 8c517d94 8c517d20 8c517e38 8c1d4900 8c23ee40 00000000 00000001
7d80: 682b2ac8 00000000 8c517e14 8c517d98 804f3820 804f4a60 682d1f20 00000149
7da0: 800759d8 80705c8c 8c517df4 8c517db8 00000000 00000000 00000000 00000000
7dc0: 00000149 8007aad4 00000001 8c516000 8c517df4 8c517de0 8005b03c 8005af5c
7de0: 80f02a38 80706b34 fffffffb 8c36bc00 8c4f0c00 8c516018 8c516000 00007530
7e00: 682b2ac8 00000000 8c517f0c 8c517e18 804ebbf8 804f3038 682b2b08 00000000
7e20: 000000a8 00000000 682b2b08 00000000 000000a8 00000000 00000013 00000001
7e40: 00000000 69e01000 00000005 75ab987c 00000000 6b26e990 00000007 00000000
7e60: 68621f08 00000000 68668038 00000000 682d1f20 00000000 00000011 00000000
7e80: 00000000 00000000 00000780 00000438 682b2b74 69e01000 0000000f 00000000
7ea0: 00000000 00000000 00000149 00000000 00000004 682b2c8c 00000000 75a0fac8
7ec0: 75ab988c 75ab9898 6b26bc10 75a10808 6b26bc10 00000001 00000000 00000780
7ee0: 8c517f2c 00007530 8c86df00 00000001 682b2ac8 8c4e9050 682b2ac8 00000000
7f00: 8c517f74 8c517f10 80118a20 804ebae4 00000000 8c516018 00000057 600f0193
7f20: 8c517f54 00000001 00000000 00000001 00000000 00000081 01cf26e8 80122c14
7f40: 00000001 00000003 8c517f74 00007530 00000003 00000001 682b2ac8 8c86df00
7f60: 8c516000 00000000 8c517fa4 8c517f78 80118c30 8011860c 8c517f90 00000001
7f80: 00000000 00002710 00007530 75ab9804 00000036 8000eb24 00000000 8c517fa8
7fa0: 8000e900 80118bf4 00002710 00007530 00000003 00007530 682b2ac8 01cdf008
7fc0: 00002710 00007530 75ab9804 00000036 68621ee8 68668038 00000000 00000000
7fe0: 75ab5cc0 682b2ab4 75aa27e4 7605266c 200f0010 00000003 1ff7e821 1ff7ec21
[<804f4c64>] (gckCOMMAND_Commit+0x210/0xa44) from [<804f3820>] (gckKERNEL_Dispatch+0x7f4/0x1268)
[<804f3820>] (gckKERNEL_Dispatch+0x7f4/0x1268) from [<804ebbf8>] (drv_ioctl+0x120/0x284)
[<804ebbf8>] (drv_ioctl+0x120/0x284) from [<80118a20>] (do_vfs_ioctl+0x420/0x5e8)
[<80118a20>] (do_vfs_ioctl+0x420/0x5e8) from [<80118c30>] (SyS_ioctl+0x48/0x74)
[<80118c30>] (SyS_ioctl+0x48/0x74) from [<8000e900>] (ret_fast_syscall+0x0/0x30)
Code: 0a000155 e5943060 e1530009 0a0000fa (e599c050) 
---[ end trace 0000000000000002 ]---
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