linux-kernel - [PATCH] genirq: Increase the number of interrupters

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Date:   Thu, 23 Jun 2022 08:45:41 +0530
From:   George Cherian <george.cherian@...vell.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <sgoutham@...vell.com>, <tglx@...utronix.de>,
        George Cherian <george.cherian@...vell.com>
Subject: [PATCH] genirq: Increase the number of interrupters

Currently the maximum number of interrupters is capped at 8260 (64 +
8196) in most of the architectures were CONFIG_SPARSE_IRQ is selected.
This upper limit is not sufficient for couple of existing SoC's from
Marvell.
For eg: Octeon TX2 series of processors support a maximum of 32K
interrupters.

Bump up the upper limit from 8196 to 65536.

Signed-off-by: George Cherian <george.cherian@...vell.com>
---
 kernel/irq/internals.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index f09c60393e559..9bb42757d4afc 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -12,7 +12,7 @@
 #include <linux/sched/clock.h>
 
 #ifdef CONFIG_SPARSE_IRQ
-# define IRQ_BITMAP_BITS	(NR_IRQS + 8196)
+# define IRQ_BITMAP_BITS	(NR_IRQS + 65536)
 #else
 # define IRQ_BITMAP_BITS	NR_IRQS
 #endif
-- 
2.25.1