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From: Mike Galbraith <efault@gmx.de>
Date: Wed, 23 Aug 2017 11:57:29 +0200
Subject: [PATCH 247/342] drivers/zram: fix zcomp_stream_get()
smp_processor_id() use in preemptible code
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=8623e80cefb82edf752c74cb790d33a96410271d
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>
---
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 dd65a27ae2cc..eece02262000 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -118,7 +118,7 @@ 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;
}
@@ -129,6 +129,7 @@ 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,
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