linux/arch/m68k
Finn Thain bcc44f6b74 m68k: mac: Don't call via_flush_cache() on Mac IIfx
There is no VIA2 chip on the Mac IIfx, so don't call via_flush_cache().
This avoids a boot crash which appeared in v5.4.

printk: console [ttyS0] enabled
printk: bootconsole [debug0] disabled
printk: bootconsole [debug0] disabled
Calibrating delay loop... 9.61 BogoMIPS (lpj=48064)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
devtmpfs: initialized
random: get_random_u32 called from bucket_table_alloc.isra.27+0x68/0x194 with crng_init=0
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
futex hash table entries: 256 (order: -1, 3072 bytes, linear)
NET: Registered protocol family 16
Data read fault at 0x00000000 in Super Data (pc=0x8a6a)
BAD KERNEL BUSERR
Oops: 00000000
Modules linked in:
PC: [<00008a6a>] via_flush_cache+0x12/0x2c
SR: 2700  SP: 01c1fe3c  a2: 01c24000
d0: 00001119    d1: 0000000c    d2: 00012000    d3: 0000000f
d4: 01c06840    d5: 00033b92    a0: 00000000    a1: 00000000
Process swapper (pid: 1, task=01c24000)
Frame format=B ssw=0755 isc=0200 isb=fff7 daddr=00000000 dobuf=01c1fed0
baddr=00008a6e dibuf=0000004e ver=f
Stack from 01c1fec4:
        01c1fed0 00007d7e 00010080 01c1fedc 0000792e 00000001 01c1fef4 00006b40
        01c80000 00040000 00000006 00000003 01c1ff1c 004a545e 004ff200 00040000
        00000000 00000003 01c06840 00033b92 004a5410 004b6c88 01c1ff84 000021e2
        00000073 00000003 01c06840 00033b92 0038507a 004bb094 004b6ca8 004b6c88
        004b6ca4 004b6c88 000021ae 00020002 00000000 01c0685d 00000000 01c1ffb4
        0049f938 00409c85 01c06840 0045bd40 00000073 00000002 00000002 00000000
Call Trace: [<00007d7e>] mac_cache_card_flush+0x12/0x1c
 [<00010080>] fix_dnrm+0x2/0x18
 [<0000792e>] cache_push+0x46/0x5a
 [<00006b40>] arch_dma_prep_coherent+0x60/0x6e
 [<00040000>] switched_to_dl+0x76/0xd0
 [<004a545e>] dma_atomic_pool_init+0x4e/0x188
 [<00040000>] switched_to_dl+0x76/0xd0
 [<00033b92>] parse_args+0x0/0x370
 [<004a5410>] dma_atomic_pool_init+0x0/0x188
 [<000021e2>] do_one_initcall+0x34/0x1be
 [<00033b92>] parse_args+0x0/0x370
 [<0038507a>] strcpy+0x0/0x1e
 [<000021ae>] do_one_initcall+0x0/0x1be
 [<00020002>] do_proc_dointvec_conv+0x54/0x74
 [<0049f938>] kernel_init_freeable+0x126/0x190
 [<0049f94c>] kernel_init_freeable+0x13a/0x190
 [<004a5410>] dma_atomic_pool_init+0x0/0x188
 [<00041798>] complete+0x0/0x3c
 [<000b9b0c>] kfree+0x0/0x20a
 [<0038df98>] schedule+0x0/0xd0
 [<0038d604>] kernel_init+0x0/0xda
 [<0038d610>] kernel_init+0xc/0xda
 [<0038d604>] kernel_init+0x0/0xda
 [<00002d38>] ret_from_kernel_thread+0xc/0x14
Code: 0000 2079 0048 10da 2279 0048 10c8 d3c8 <1011> 0200 fff7 1280 d1f9 0048 10c8 1010 0000 0008 1080 4e5e 4e75 4e56 0000 2039
Disabling lock debugging due to kernel taint
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

Thanks to Stan Johnson for capturing the console log and running git
bisect.

Git bisect said commit 8e3a68fb55 ("dma-mapping: make
dma_atomic_pool_init self-contained") is the first "bad" commit. I don't
know why. Perhaps mach_l2_flush first became reachable with that commit.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-and-tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Cc: Joshua Thompson <funaho@jurai.org>
Link: https://lore.kernel.org/r/b8bbeef197d6b3898e82ed0d231ad08f575a4b34.1589949122.git.fthain@telegraphics.com.au
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2020-05-25 10:55:56 +02:00
..
68000 m68k: Replace setup_irq() by request_irq() 2020-03-23 12:01:19 +10:00
amiga m68k: amiga: config: Replace zero-length array with flexible-array member 2020-04-27 11:51:08 +02:00
apollo treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
atari m68k/atari: Convert Falcon IDE drivers to platform drivers 2019-11-18 10:18:59 +01:00
bvme6000 treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
coldfire m68k: Replace setup_irq() by request_irq() 2020-03-23 12:01:19 +10:00
configs m68k: defconfig: Update defconfigs for v5.7-rc1 2020-05-11 10:50:03 +02:00
emu block: simplify queue allocation 2020-03-27 10:23:43 -06:00
fpsp040 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hp300 treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
ifpsp060 scripts/spelling.txt: add regsiter -> register spelling mistake 2017-05-08 17:15:13 -07:00
include m68k: mac: Don't call via_flush_cache() on Mac IIfx 2020-05-25 10:55:56 +02:00
kernel .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
lib treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mac m68k: mac: Don't call via_flush_cache() on Mac IIfx 2020-05-25 10:55:56 +02:00
math-emu treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 74 2019-05-24 17:36:47 +02:00
mm mm/vma: append unlikely() while testing VMA access permissions 2020-04-07 10:43:38 -07:00
mvme16x treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
mvme147 treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
q40 m68k: q40: Fix info-leak in rtc_ioctl 2019-10-21 09:08:15 +02:00
sun3 treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
sun3x arch/m68k/setup: Drop dummy_con initialization 2020-01-14 15:29:16 +01:00
tools/amiga License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
install.sh
Kconfig m68k: Implement copy_thread_tls() 2020-01-14 10:43:38 +01:00
Kconfig.bus m68k: Fix Kconfig indentation 2020-03-09 11:12:19 +01:00
Kconfig.cpu PCI: consolidate PCI config entry in drivers/pci 2018-11-23 11:45:34 +09:00
Kconfig.debug m68k: Fix Kconfig indentation 2020-03-09 11:12:19 +01:00
Kconfig.devices License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig.machine m68k: Fix Kconfig indentation 2020-03-09 11:12:19 +01:00
Makefile kbuild: rebuild modules when module linker scripts are updated 2019-08-21 21:05:21 +09:00