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From e2e03d2e904d1df3d1e70dd70d5d939a6f5ccb26 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 9 Jan 2013 12:08:15 +0100
Subject: [PATCH 082/347] slub: Enable irqs for __GFP_WAIT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.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 | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/mm/slub.c b/mm/slub.c
index 959ccf873292..3b1edb545215 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1597,10 +1597,17 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
void *start, *p;
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;
@@ -1659,7 +1666,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
page->frozen = 1;
out:
- if (gfpflags_allow_blocking(flags))
+ if (enableirqs)
local_irq_disable();
if (!page)
return NULL;
--
2.36.1
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