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From c0f57e0b6278391f1fec71ccb1e25fe46deade2b Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 9 Jan 2013 12:08:15 +0100
Subject: [PATCH 205/323] slub: Enable irqs for __GFP_WAIT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.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.
[bigeasy: Add warning on RT for allocations in atomic context.
Don't enable interrupts on allocations during SYSTEM_SUSPEND. This is done
during suspend by ACPI, noticed by Liwei Song <liwei.song@windriver.com>
]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
mm/slub.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/mm/slub.c b/mm/slub.c
index ac2ddf6a4220..00f1d1206dbc 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1750,10 +1750,18 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
void *start, *p, *next;
int idx;
bool shuffle;
+ bool enableirqs = false;
flags &= gfp_allowed_mask;
if (gfpflags_allow_blocking(flags))
+ enableirqs = true;
+
+#ifdef CONFIG_PREEMPT_RT
+ if (system_state > SYSTEM_BOOTING && system_state < SYSTEM_SUSPEND)
+ enableirqs = true;
+#endif
+ if (enableirqs)
local_irq_enable();
flags |= s->allocflags;
@@ -1812,7 +1820,7 @@ 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;
@@ -2870,6 +2878,10 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s,
unsigned long tid;
struct obj_cgroup *objcg = NULL;
+ if (IS_ENABLED(CONFIG_PREEMPT_RT) && IS_ENABLED(CONFIG_DEBUG_ATOMIC_SLEEP))
+ WARN_ON_ONCE(!preemptible() &&
+ (system_state > SYSTEM_BOOTING && system_state < SYSTEM_SUSPEND));
+
s = slab_pre_alloc_hook(s, &objcg, 1, gfpflags);
if (!s)
return NULL;
@@ -3338,6 +3350,10 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
int i;
struct obj_cgroup *objcg = NULL;
+ if (IS_ENABLED(CONFIG_PREEMPT_RT) && IS_ENABLED(CONFIG_DEBUG_ATOMIC_SLEEP))
+ WARN_ON_ONCE(!preemptible() &&
+ (system_state > SYSTEM_BOOTING && system_state < SYSTEM_SUSPEND));
+
/* memcg and kmem_cache debug support */
s = slab_pre_alloc_hook(s, &objcg, size, flags);
if (unlikely(!s))
--
2.43.0
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