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percpu: convert spin_lock_irq to spin_lock_irqsave.

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[ Upstream commit 6ab7d47bcb ]

From Michael Cree:
  "Bisection lead to commit b38d08f318 ("percpu: restructure
   locking") as being the cause of lockups at initial boot on
   the kernel built for generic Alpha.

   On a suggestion by Tejun Heo that:

   So, the only thing I can think of is that it's calling
   spin_unlock_irq() while irq handling isn't set up yet.
   Can you please try the followings?

   1. Convert all spin_[un]lock_irq() to
      spin_lock_irqsave/unlock_irqrestore()."

Fixes: b38d08f318 ("percpu: restructure locking")
Reported-and-tested-by: Michael Cree <mcree@orcon.net.nz>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dennis Zhou 2018-12-18 08:42:27 -08:00 committed by Greg Kroah-Hartman
parent 4408149278
commit 04fed9d3e7
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);