linux-kernel - [PATCH] [irq] Fix boot failure when irqaffinity is passed.

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Message-Id: <20171026045800.27087-1-rakib.mullick@gmail.com>
Date:   Thu, 26 Oct 2017 10:58:00 +0600
From:   Rakib Mullick <rakib.mullick@...il.com>
To:     mingo@...nel.org, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH]  [irq] Fix boot failure when irqaffinity is passed.

When irqaffinity kernel param is passed in a CPUMASK_OFFSTACK=y build
kernel, it fails to boot. zalloc_cpumask_var() cannot be used before
initializing mm stuff (slab allocator) to allocate cpumask. So, use
alloc_bootmem_cpumask_var(). Also in init_irq_default_affinity() removes
unneeded ifdef, these ifdef conditions are handled at defination site.

Signed-off-by: Rakib Mullick <rakib.mullick@...il.com>
---
 kernel/irq/irqdesc.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 982a357..db6380d 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -27,7 +27,7 @@ static struct lock_class_key irq_desc_lock_class;
 #if defined(CONFIG_SMP)
 static int __init irq_affinity_setup(char *str)
 {
-	zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
+	alloc_bootmem_cpumask_var(&irq_default_affinity);
 	cpulist_parse(str, irq_default_affinity);
 	/*
 	 * Set at least the boot cpu. We don't want to end up with
@@ -40,10 +40,8 @@ __setup("irqaffinity=", irq_affinity_setup);

 static void __init init_irq_default_affinity(void)
 {
-#ifdef CONFIG_CPUMASK_OFFSTACK
 	if (!irq_default_affinity)
 		zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
-#endif
 	if (cpumask_empty(irq_default_affinity))
 		cpumask_setall(irq_default_affinity);
 }
-- 
2.9.3