linux-kernel - [PATCH] genirq/irqdomain: Make sure all irq domain flags are distinct

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Date:   Fri, 21 Feb 2020 10:07:25 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <maz@...nel.org>, <tglx@...utronix.de>,
        <wanghaibin.wang@...wei.com>, Zenghui Yu <yuzenghui@...wei.com>
Subject: [PATCH] genirq/irqdomain: Make sure all irq domain flags are distinct

This was noticed when printing debugfs for MSIs on my ARM64 server.
The new dstate IRQD_MSI_NOMASK_QUIRK came out surprisingly while it
should only be the x86 stuff for the time being...

It's the overlap in irqdomain flags which leads to this confusion.
(1 << 1) might be a good choice for old IRQ_DOMAIN_NAME_ALLOCATED,
use it to avoid this overlap.

Fixes: 6f1a4891a592 ("x86/apic/msi: Plug non-maskable MSI affinity race")
Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
---
 include/linux/irqdomain.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index b2d47571ab67..8d062e86d954 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -192,7 +192,7 @@ enum {
 	IRQ_DOMAIN_FLAG_HIERARCHY	= (1 << 0),
 
 	/* Irq domain name was allocated in __irq_domain_add() */
-	IRQ_DOMAIN_NAME_ALLOCATED	= (1 << 6),
+	IRQ_DOMAIN_NAME_ALLOCATED	= (1 << 1),
 
 	/* Irq domain is an IPI domain with virq per cpu */
 	IRQ_DOMAIN_FLAG_IPI_PER_CPU	= (1 << 2),
-- 
2.19.1