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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     John David Anglin <dave.anglin@bell.net>,
        Helge Deller <deller@gmx.de>, Sasha Levin <sashal@kernel.org>,
        linux-parisc@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 16/16] parisc: Bump 64-bit IRQ stack size to 64 KB
Date:   Wed, 24 Feb 2021 07:55:13 -0500
Message-Id: <20210224125514.483935-16-sashal@kernel.org>
In-Reply-To: <20210224125514.483935-1-sashal@kernel.org>
References: <20210224125514.483935-1-sashal@kernel.org>
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From: John David Anglin <dave.anglin@bell.net>

[ Upstream commit 31680c1d1595a59e17c14ec036b192a95f8e5f4a ]

Bump 64-bit IRQ stack size to 64 KB.

I had a kernel IRQ stack overflow on the mx3210 debian buildd machine.  This patch increases the
64-bit IRQ stack size to 64 KB.  The 64-bit stack size needs to be larger than the 32-bit stack
size since registers are twice as big.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/parisc/kernel/irq.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index 0ca254085a662..c152c30c2d06d 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -380,7 +380,11 @@ static inline int eirr_to_irq(unsigned long eirr)
 /*
  * IRQ STACK - used for irq handler
  */
+#ifdef CONFIG_64BIT
+#define IRQ_STACK_SIZE      (4096 << 4) /* 64k irq stack size */
+#else
 #define IRQ_STACK_SIZE      (4096 << 3) /* 32k irq stack size */
+#endif
 
 union irq_stack_union {
 	unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)];
-- 
2.27.0