linux-kernel - [patch-rt] drivers/zram: fix zcomp_stream_get() smp_processor

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Date:   Wed, 23 Aug 2017 11:57:29 +0200
From:   Mike Galbraith <efault@....de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [patch-rt] drivers/zram: fix zcomp_stream_get() smp_processor_id()
 use in preemptible code


Use get_local_ptr() vs this_cpu_ptr().

Signed-off-by: Mike Galbraith <efault@....de>
---
 drivers/block/zram/zcomp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -120,7 +120,7 @@ struct zcomp_strm *zcomp_stream_get(stru
 {
 	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,