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Date: Mon, 28 Jan 2019 11:11:02 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Dennis Zhou <dennis@...nel.org>, Sasha Levin <sashal@...nel.org>, linux-mm@...ck.org Subject: [PATCH AUTOSEL 4.14 112/170] percpu: convert spin_lock_irq to spin_lock_irqsave. From: Dennis Zhou <dennis@...nel.org> [ Upstream commit 6ab7d47bcbf0144a8cb81536c2cead4cde18acfe ] >From Michael Cree: "Bisection lead to commit b38d08f3181c ("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: b38d08f3181c ("percpu: restructure locking") Reported-and-tested-by: Michael Cree <mcree@...on.net.nz> Acked-by: Tejun Heo <tj@...nel.org> Signed-off-by: Dennis Zhou <dennis@...nel.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- mm/percpu-km.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/percpu-km.c b/mm/percpu-km.c index 0d88d7bd5706..c22d959105b6 100644 --- a/mm/percpu-km.c +++ b/mm/percpu-km.c @@ -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); -- 2.19.1
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