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Merge branch 'for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu

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Pull percpu update from Dennis Zhou:
 "Michael Cree noted generic UP Alpha has been broken since v3.18. This
  is a small fix for locking in UP percpu code that fixes the issue"

* 'for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
  percpu: convert spin_lock_irq to spin_lock_irqsave.
This commit is contained in:
Linus Torvalds 2018-12-29 10:13:23 -08:00
commit 55db91fbaa
1 changed files with 3 additions and 2 deletions
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5
mm/percpu-km.c
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@ -50,6 +50,7 @@ static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
struct pcpu_chunk *chunk;
struct page *pages;
unsigned long flags;
int i;
chunk = pcpu_alloc_chunk(gfp);
@ -68,9 +69,9 @@ static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
chunk->data = pages;
chunk->base_addr = page_address(pages) - pcpu_group_offsets[0];
spin_lock_irq(&pcpu_lock);
spin_lock_irqsave(&pcpu_lock, flags);
pcpu_chunk_populated(chunk, 0, nr_pages, false);
spin_unlock_irq(&pcpu_lock);
spin_unlock_irqrestore(&pcpu_lock, flags);
pcpu_stats_chunk_alloc();
trace_percpu_create_chunk(chunk->base_addr);