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Subject[PATCH RT 1/4] drivers/zram: fix zcomp_stream_get() smp_processor_id() use in preemptible code
4.9.61-rt52-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Mike Galbraith <efault@gmx.de>

Use get_local_ptr() instead this_cpu_ptr() to avoid a warning regarding
smp_processor_id() in preemptible code.
raw_cpu_ptr() would be fine, too because the per-CPU data structure is
protected with a spin lock so it does not matter much if we take the
other one.

Cc: stable-rt@vger.kernel.org
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
drivers/block/zram/zcomp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index fa8329ad79fd..8c93ee150ee8 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -120,7 +120,7 @@ struct zcomp_strm *zcomp_stream_get(struct zcomp *comp)
{
struct zcomp_strm *zstrm;

- zstrm = *this_cpu_ptr(comp->stream);
+ zstrm = *get_local_ptr(comp->stream);
spin_lock(&zstrm->zcomp_lock);
return zstrm;
}
@@ -131,6 +131,7 @@ void zcomp_stream_put(struct zcomp *comp)

zstrm = *this_cpu_ptr(comp->stream);
spin_unlock(&zstrm->zcomp_lock);
+ put_local_ptr(zstrm);
}

int zcomp_compress(struct zcomp_strm *zstrm,
--
2.13.2

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