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| author |   Rabin Vincent <rabin@rab.in> | 2015-02-19 18:20:09 +0100 |
|---|---|---|
| committer |   Jesper Nilsson <jespern@axis.com> | 2015-03-25 10:54:06 +0100 |
| commit | 06aca92424c2a53a9e26cb81c1d6a829af9491b8 (patch) | |
| tree | e85258187b8d566464427228df1fb7703284b826 | |
| parent | CRISv32: handle multiple signals (diff) | |
| download | linux-dev-06aca92424c2a53a9e26cb81c1d6a829af9491b8.tar.xz linux-dev-06aca92424c2a53a9e26cb81c1d6a829af9491b8.zip | |
CRISv32: don't enable irqs in INIT_THREAD
INIT_THREAD enables interrupts in the thread_struct's saved flags. This
means that interrupts get enabled in the middle of context_switch()
while switching to new tasks that get forked off the init task during
boot. Don't do this.
Fixes the following splat on boot with spinlock debugging on:
BUG: spinlock cpu recursion on CPU#0, swapper/2
lock: runqueues+0x0/0x47c, .magic: dead4ead, .owner: swapper/0,
.owner_cpu: 0
CPU: 0 PID: 2 Comm: swapper Not tainted 3.19.0-08796-ga747b55 #285
Call Trace:
[<c0032b80>] spin_bug+0x2a/0x36
[<c0032c98>] do_raw_spin_lock+0xa2/0x126
[<c01964b0>] _raw_spin_lock+0x20/0x2a
[<c00286c8>] scheduler_tick+0x22/0x76
[<c003db2c>] update_process_times+0x5e/0x72
[<c0007a94>] timer_interrupt+0x4e/0x6a
[<c00378d6>] handle_irq_event_percpu+0x54/0xf2
[<c00379c4>] handle_irq_event+0x50/0x74
[<c003988e>] handle_simple_irq+0x6c/0xbe
[<c0037270>] generic_handle_irq+0x2a/0x36
[<c0004c40>] do_IRQ+0x38/0x84
[<c000662e>] crisv32_do_IRQ+0x54/0x60
[<c0006204>] IRQ0x4b_interrupt+0x34/0x3c
[<c0192baa>] __schedule+0x24a/0x532
[<c00056b4>] ret_from_kernel_thread+0x0/0x14
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Jesper Nilsson <jespern@axis.com>
| -rw-r--r-- | arch/cris/include/arch-v32/arch/processor.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/cris/include/arch-v32/arch/processor.h b/arch/cris/include/arch-v32/arch/processor.h index a024b7d32fed..568759271ab5 100644 --- a/arch/cris/include/arch-v32/arch/processor.h +++ b/arch/cris/include/arch-v32/arch/processor.h @@ -25,8 +25,7 @@ struct thread_struct { */ #define TASK_SIZE (0xB0000000UL) -/* CCS I=1, enable interrupts. */ -#define INIT_THREAD { 0, 0, (1 << I_CCS_BITNR) } +#define INIT_THREAD { } #define KSTK_EIP(tsk) \ ({ \ |