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percpu: fix early calls for spinlock in pcpu_stats

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From 2c06e795162cb306c9707ec51d3e1deadb37f573 Mon Sep 17 00:00:00 2001
From: Dennis Zhou <dennisz@fb.com>
Date: Wed, 21 Jun 2017 10:17:09 -0700

Commit 30a5b5367e ("percpu: expose statistics about percpu memory via
debugfs") introduces percpu memory statistics. pcpu_stats_chunk_alloc
takes the spin lock and disables/enables irqs on creation of a chunk. Irqs
are not enabled when the first chunk is initialized and thus kernels are
failing to boot with kernel debugging enabled. Fixed by changing _irq to
_irqsave and _irqrestore.

Fixes: 30a5b5367e ("percpu: expose statistics about percpu memory via debugfs")
Signed-off-by: Dennis Zhou <dennisz@fb.com>
Reported-by: Alexander Levin <alexander.levin@verizon.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Dennis Zhou 2017-06-21 13:52:46 -04:00 • committed by Tejun Heo
parent 11df02bf9b
commit 303abfdf76
1 changed files with 6 additions and 4 deletions
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10
mm/percpu-internal.h
View file

@ -116,13 +116,14 @@ static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
*/ */
static inline void pcpu_stats_chunk_alloc(void) static inline void pcpu_stats_chunk_alloc(void)
{ {
spin_lock_irq(&pcpu_lock); unsigned long flags;
spin_lock_irqsave(&pcpu_lock, flags);
pcpu_stats.nr_chunks++; pcpu_stats.nr_chunks++;
pcpu_stats.nr_max_chunks = pcpu_stats.nr_max_chunks =
max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks); max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks);
spin_unlock_irq(&pcpu_lock); spin_unlock_irqrestore(&pcpu_lock, flags);
} }
/* /*
@ -130,11 +131,12 @@ static inline void pcpu_stats_chunk_alloc(void)
*/ */
static inline void pcpu_stats_chunk_dealloc(void) static inline void pcpu_stats_chunk_dealloc(void)
{ {
spin_lock_irq(&pcpu_lock); unsigned long flags;
spin_lock_irqsave(&pcpu_lock, flags);
pcpu_stats.nr_chunks--; pcpu_stats.nr_chunks--;
spin_unlock_irq(&pcpu_lock); spin_unlock_irqrestore(&pcpu_lock, flags);
} }
#else #else