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Message-Id: <20190812092236.16648-2-santosh@fossix.org>
Date: Mon, 12 Aug 2019 14:52:30 +0530
From: Santosh Sivaraj <santosh@...six.org>
To: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
Linux Kernel <linux-kernel@...r.kernel.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
Mahesh Salgaonkar <mahesh@...ux.ibm.com>,
Reza Arbab <arbab@...ux.ibm.com>,
Balbir Singh <bsingharora@...il.com>,
Chandan Rajendra <chandan@...ux.vnet.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
christophe leroy <christophe.leroy@....fr>,
Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
stable@...r.kernel.org
Subject: [PATCH v9 1/7] powerpc/mce: Schedule work from irq_work
schedule_work() cannot be called from MCE exception context as MCE can
interrupt even in interrupt disabled context.
fixes: 733e4a4c ("powerpc/mce: hookup memory_failure for UE errors")
Suggested-by: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
Signed-off-by: Santosh Sivaraj <santosh@...six.org>
Cc: stable@...r.kernel.org # v4.15+
---
arch/powerpc/kernel/mce.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c
index b18df633eae9..cff31d4a501f 100644
--- a/arch/powerpc/kernel/mce.c
+++ b/arch/powerpc/kernel/mce.c
@@ -33,6 +33,7 @@ static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT],
mce_ue_event_queue);
static void machine_check_process_queued_event(struct irq_work *work);
+static void machine_check_ue_irq_work(struct irq_work *work);
void machine_check_ue_event(struct machine_check_event *evt);
static void machine_process_ue_event(struct work_struct *work);
@@ -40,6 +41,10 @@ static struct irq_work mce_event_process_work = {
.func = machine_check_process_queued_event,
};
+static struct irq_work mce_ue_event_irq_work = {
+ .func = machine_check_ue_irq_work,
+};
+
DECLARE_WORK(mce_ue_event_work, machine_process_ue_event);
static void mce_set_error_info(struct machine_check_event *mce,
@@ -199,6 +204,10 @@ void release_mce_event(void)
get_mce_event(NULL, true);
}
+static void machine_check_ue_irq_work(struct irq_work *work)
+{
+ schedule_work(&mce_ue_event_work);
+}
/*
* Queue up the MCE event which then can be handled later.
@@ -216,7 +225,7 @@ void machine_check_ue_event(struct machine_check_event *evt)
memcpy(this_cpu_ptr(&mce_ue_event_queue[index]), evt, sizeof(*evt));
/* Queue work to process this event later. */
- schedule_work(&mce_ue_event_work);
+ irq_work_queue(&mce_ue_event_irq_work);
}
/*
--
2.21.0
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