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Subject: slub: Enable irqs for __GFP_WAIT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 09 Jan 2013 12:08:15 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.0/older/patches-5.0.10-rt7.tar.xz
SYSTEM_RUNNING might be too late for enabling interrupts. Allocations
with GFP_WAIT can happen before that. So use this as an indicator.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
mm/slub.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1630,10 +1630,18 @@ static struct page *allocate_slab(struct
void *start, *p, *next;
int idx, order;
bool shuffle;
+ bool enableirqs = false;
flags &= gfp_allowed_mask;
if (gfpflags_allow_blocking(flags))
+ enableirqs = true;
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+ if (system_state > SYSTEM_BOOTING)
+ enableirqs = true;
+#endif
+ if (enableirqs)
local_irq_enable();
flags |= s->allocflags;
@@ -1693,7 +1701,7 @@ static struct page *allocate_slab(struct
page->frozen = 1;
out:
- if (gfpflags_allow_blocking(flags))
+ if (enableirqs)
local_irq_disable();
if (!page)
return NULL;
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