linux-kernel - [PATCH v8 1/7] powerpc/mce: Schedule work from irq

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Message-Id: <20190807145700.25599-2-santosh@fossix.org>
Date:   Wed,  7 Aug 2019 20:26:54 +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>
Subject: [PATCH v8 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")
Signed-off-by: Santosh Sivaraj <santosh@...six.org>
---
 arch/powerpc/kernel/mce.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c
index b18df633eae9..0ab6fa7cbbbb 100644
--- a/arch/powerpc/kernel/mce.c
+++ b/arch/powerpc/kernel/mce.c
@@ -144,7 +144,6 @@ void save_mce_event(struct pt_regs *regs, long handled,
 		if (phys_addr != ULONG_MAX) {
 			mce->u.ue_error.physical_address_provided = true;
 			mce->u.ue_error.physical_address = phys_addr;
-			machine_check_ue_event(mce);
 		}
 	}
 	return;
@@ -275,8 +274,7 @@ static void machine_process_ue_event(struct work_struct *work)
 	}
 }
 /*
- * process pending MCE event from the mce event queue. This function will be
- * called during syscall exit.
+ * process pending MCE event from the mce event queue.
  */
 static void machine_check_process_queued_event(struct irq_work *work)
 {
@@ -292,6 +290,10 @@ static void machine_check_process_queued_event(struct irq_work *work)
 	while (__this_cpu_read(mce_queue_count) > 0) {
 		index = __this_cpu_read(mce_queue_count) - 1;
 		evt = this_cpu_ptr(&mce_event_queue[index]);
+
+		if (evt->error_type == MCE_ERROR_TYPE_UE)
+			machine_check_ue_event(evt);
+
 		machine_check_print_event_info(evt, false, false);
 		__this_cpu_dec(mce_queue_count);
 	}
-- 
2.20.1