[PATCH] parisc: Bump 64-bit IRQ stack size to 64 KB

* [PATCH] parisc: Bump 64-bit IRQ stack size to 64 KB
@ 2021-01-28 23:12 John David Anglin
  0 siblings, 0 replies; only message in thread
From: John David Anglin @ 2021-01-28 23:12 UTC (permalink / raw)
  To: linux-parisc; +Cc: Helge Deller, James Bottomley

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>

diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index e76c86619949..60f5829d476f 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -376,7 +376,11 @@ 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)];

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