diff options
| author |   Dennis Zhou <dennis@kernel.org> | 2018-12-18 08:42:27 -0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-12 19:46:05 +0100 |
| commit | 04fed9d3e7d2fdce1217195fc5ddc08e8209579a (patch) | |
| tree | 10fd4a9e1c1abcce24e9a87ce21be16a67738fee /mm | |
| parent | usb: musb: dsps: fix otg state machine (diff) | |
| download | linux-stable-04fed9d3e7d2fdce1217195fc5ddc08e8209579a.tar.xz linux-stable-04fed9d3e7d2fdce1217195fc5ddc08e8209579a.zip | |
percpu: convert spin_lock_irq to spin_lock_irqsave.
[ 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@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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/percpu-km.c | 5 |
1 files 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); |