https://github.com/torvalds/linux
Revision 900897591b2bf01154db8f59f6ecf8d60e60f15e authored by Guo Ren on 24 May 2020, 08:03:07 UTC, committed by Guo Ren on 28 May 2020, 00:18:36 UTC
log: [ 0.13373200] Calibrating delay loop... [ 0.14077600] ------------[ cut here ]------------ [ 0.14116700] WARNING: CPU: 0 PID: 0 at kernel/sched/core.c:3790 preempt_count_add+0xc8/0x11c [ 0.14348000] DEBUG_LOCKS_WARN_ON((preempt_count() < 0))Modules linked in: [ 0.14395100] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0 #7 [ 0.14410800] [ 0.14427400] Call Trace: [ 0.14450700] [<807cd226>] dump_stack+0x8a/0xe4 [ 0.14473500] [<80072792>] __warn+0x10e/0x15c [ 0.14495900] [<80072852>] warn_slowpath_fmt+0x72/0xc0 [ 0.14518600] [<800a5240>] preempt_count_add+0xc8/0x11c [ 0.14544900] [<807ef918>] _raw_spin_lock+0x28/0x68 [ 0.14572600] [<800e0eb8>] vprintk_emit+0x84/0x2d8 [ 0.14599000] [<800e113a>] vprintk_default+0x2e/0x44 [ 0.14625100] [<800e2042>] vprintk_func+0x12a/0x1d0 [ 0.14651300] [<800e1804>] printk+0x30/0x48 [ 0.14677600] [<80008052>] lockdep_init+0x12/0xb0 [ 0.14703800] [<80002080>] start_kernel+0x558/0x7f8 [ 0.14730000] [<800052bc>] csky_start+0x58/0x94 [ 0.14756600] irq event stamp: 34 [ 0.14775100] hardirqs last enabled at (33): [<80067370>] ret_from_exception+0x2c/0x72 [ 0.14793700] hardirqs last disabled at (34): [<800e0eae>] vprintk_emit+0x7a/0x2d8 [ 0.14812300] softirqs last enabled at (32): [<800655b0>] __do_softirq+0x578/0x6d8 [ 0.14830800] softirqs last disabled at (25): [<8007b3b8>] irq_exit+0xec/0x128 The preempt_count of reg could be destroyed after csky_do_IRQ without reload from memory. After reference to other architectures (arm64, riscv), we move preempt entry into ret_from_exception and disable irq at the beginning of ret_from_exception instead of RESTORE_ALL. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Reported-by: Lu Baoquan <lu.baoquan@intellif.com>
1 parent 9cb1fd0
Tip revision: 900897591b2bf01154db8f59f6ecf8d60e60f15e authored by Guo Ren on 24 May 2020, 08:03:07 UTC
csky: Fixup CONFIG_PREEMPT panic
csky: Fixup CONFIG_PREEMPT panic
Tip revision: 9008975
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | -rw-r--r-- | 15.8 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
| .gitignore | -rw-r--r-- | 1.7 KB |
| .mailmap | -rw-r--r-- | 15.2 KB |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 97.4 KB |
| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 595 bytes |
| MAINTAINERS | -rw-r--r-- | 539.4 KB |
| Makefile | -rw-r--r-- | 60.3 KB |
| README | -rw-r--r-- | 727 bytes |
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