From 10d94ff4d558b96bfc4f55bb0051ae4d938246fe Mon Sep 17 00:00:00 2001
From: Rakib Mullick <rakib.mullick@gmail.com>
Date: Wed, 1 Nov 2017 10:14:51 +0600
Subject: [PATCH] irq/core: Fix boot crash when the irqaffinity= boot parameter is passed on CPUMASK_OFFSTACK=y kernels(v1)
Git-commit: 10d94ff4d558b96bfc4f55bb0051ae4d938246fe
Patch-mainline: v4.15-rc1
References: bsc#1051510
When the irqaffinity= kernel parameter is passed in a CPUMASK_OFFSTACK=y
kernel, it fails to boot, because zalloc_cpumask_var() cannot be used before
initializing the slab allocator to allocate a cpumask.
So, use alloc_bootmem_cpumask_var() instead.
Also do some cleanups while at it: in init_irq_default_affinity() remove
an #ifdef via using cpumask_available().
Signed-off-by: Rakib Mullick <rakib.mullick@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171026045800.27087-1-rakib.mullick@gmail.com
Link: http://lkml.kernel.org/r/20171101041451.12581-1-rakib.mullick@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
kernel/irq/irqdesc.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 982a3576fb01..f2edcf85780d 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)
+ if (!cpumask_available(irq_default_affinity))
zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
-#endif
if (cpumask_empty(irq_default_affinity))
cpumask_setall(irq_default_affinity);
}
--
2.18.0