Guo Ren 900897591b csky: Fixup CONFIG_PREEMPT panic ... 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>		2020-05-28 00:18:36 +00:00
..
probes	csky: Fixup perf probe -x hungup	2020-05-13 17:55:05 +08:00
asm-offsets.c	csky: Fixup gdbmacros.txt with name sp in thread_struct	2020-05-15 00:16:18 +08:00
atomic.S	csky: Set regs->usp to kernel sp, when the exception is from kernel	2020-02-21 15:43:24 +08:00
cpu-probe.c	csky: Exception handling and mm-fault	2018-10-25 23:36:19 +08:00
entry.S	csky: Fixup CONFIG_PREEMPT panic	2020-05-28 00:18:36 +00:00
ftrace.c	csky/ftrace: Fixup error when disable CONFIG_DYNAMIC_FTRACE	2020-05-13 17:55:05 +08:00
head.S	csky: Fixup cpu speculative execution to IO area	2020-04-03 12:40:07 +08:00
irq.c	csky: IRQ handling	2018-10-26 00:54:22 +08:00
Makefile	csky: Fixup calltrace panic	2020-05-13 17:55:06 +08:00
module.c	csky: fixup compile error with CPU 810.	2019-01-10 04:37:37 -08:00
perf_callchain.c	csky: Fixup perf callchain unwind	2020-05-13 17:55:05 +08:00
perf_event.c	csky: Move static keyword to the front of declaration	2019-09-30 11:50:49 +08:00
perf_regs.c	csky: Add support for perf registers sampling	2019-04-22 13:44:57 +08:00
power.c	csky: Library functions	2018-10-26 00:54:24 +08:00
process.c	csky: Fixup gdbmacros.txt with name sp in thread_struct	2020-05-15 00:16:18 +08:00
ptrace.c	csky: Fixup perf probe -x hungup	2020-05-13 17:55:05 +08:00
setup.c	csky: Fixup cpu speculative execution to IO area	2020-04-03 12:40:07 +08:00
signal.c	csky: Add uprobes support	2020-04-03 11:37:51 +08:00
smp.c	csky: Fixup cpu speculative execution to IO area	2020-04-03 12:40:07 +08:00
stacktrace.c	csky: Fixup calltrace panic	2020-05-13 17:55:06 +08:00
syscall_table.c	csky: System Call	2018-10-25 23:36:19 +08:00
syscall.c	csky: System Call	2018-10-25 23:36:19 +08:00
time.c	csky: Replace <linux/clk-provider.h> by <linux/of_clk.h>	2020-02-23 12:48:55 +08:00
traps.c	csky: Add uprobes support	2020-04-03 11:37:51 +08:00
vdso.c	csky: VDSO and rt_sigreturn	2018-10-26 00:54:22 +08:00
vmlinux.lds.S	csky: Tightly-Coupled Memory or Sram support	2020-02-21 15:43:24 +08:00