From: Stafford Horne <shorne@gmail.com>
To: openrisc@lists.librecores.org
Subject: [OpenRISC] [PATCH v3 07/13] openrisc: fix initial preempt state for secondary cpu tasks
Date: Sun, 22 Oct 2017 12:15:54 +0900 [thread overview]
Message-ID: <20171022031600.29612-8-shorne@gmail.com> (raw)
In-Reply-To: <20171022031600.29612-1-shorne@gmail.com>
During SMP testing we were getting the below warning after booting the
secondary cpu:
[ 0.060000] BUG: scheduling while atomic: swapper/1/0/0x00000000
This change follows similar patterns from other architectures to start
the schduler with preempt disabled.
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
arch/openrisc/include/asm/thread_info.h | 2 +-
arch/openrisc/kernel/smp.c | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/openrisc/include/asm/thread_info.h b/arch/openrisc/include/asm/thread_info.h
index 6e619a79a401..c229aa6bb502 100644
--- a/arch/openrisc/include/asm/thread_info.h
+++ b/arch/openrisc/include/asm/thread_info.h
@@ -74,7 +74,7 @@ struct thread_info {
.task = &tsk, \
.flags = 0, \
.cpu = 0, \
- .preempt_count = 1, \
+ .preempt_count = INIT_PREEMPT_COUNT, \
.addr_limit = KERNEL_DS, \
.ksp = 0, \
}
diff --git a/arch/openrisc/kernel/smp.c b/arch/openrisc/kernel/smp.c
index fd724123229a..154c94a0cfbc 100644
--- a/arch/openrisc/kernel/smp.c
+++ b/arch/openrisc/kernel/smp.c
@@ -128,6 +128,7 @@ asmlinkage __init void secondary_start_kernel(void)
local_irq_enable();
+ preempt_disable();
/*
* OK, it's off to the idle thread for us
*/
--
2.13.6
next prev parent reply other threads:[~2017-10-22 3:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-22 3:15 [OpenRISC] [PATCH v3 00/13] OpenRISC SMP Support Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 01/13] openrisc: use shadow registers to save regs on exception Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 02/13] openrisc: add 1 and 2 byte cmpxchg support Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 03/13] openrisc: use qspinlocks and qrwlocks Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 04/13] dt-bindings: add openrisc to vendor prefixes list Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 05/13] irqchip: add initial support for ompic Stafford Horne
2017-10-23 8:00 ` Marc Zyngier
2017-10-23 12:57 ` Stafford Horne
2017-10-27 3:19 ` Rob Herring
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 06/13] openrisc: initial SMP support Stafford Horne
2017-10-22 3:15 ` Stafford Horne [this message]
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 08/13] openrisc: sleep instead of spin on secondary wait Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 09/13] openrisc: add cacheflush support to fix icache aliasing Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 10/13] openrisc: add simple_smp dts and defconfig for simulators Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 11/13] openrisc: support framepointers and STACKTRACE_SUPPORT Stafford Horne
2017-10-22 3:15 ` [OpenRISC] [PATCH v3 12/13] openrisc: enable LOCKDEP_SUPPORT and irqflags tracing Stafford Horne
2017-10-22 3:16 ` [OpenRISC] [PATCH v3 13/13] openrisc: add tick timer multi-core sync logic Stafford Horne
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