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>

...

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Dennis Zhou 2018-12-18 08:42:27 -08:00 • committed by Greg Kroah-Hartman

parent ff32c3a3b0

commit 9b8b41319d

1 changed files with 3 additions and 2 deletions

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mm/percpu-km.c

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