linux-kernel - [patch] drivers/zram: Don't disable preemption in zcomp_stream

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Date:   Sun, 16 Oct 2016 05:14:22 +0200
From:   Mike Galbraith <umgwanakikbuti@...il.com>
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] drivers/zram: Don't disable preemption in
 zcomp_stream_get/put()


In v4.7, the driver switched to percpu compression streams, disabling
preemption (get/put_cpu_ptr()).  Use get/put_cpu_light() instead.

Signed-off-by: Mike Galbraith <umgwanakikbuti@...il.com>
---
 drivers/block/zram/zcomp.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -118,12 +118,12 @@ ssize_t zcomp_available_show(const char
 
 struct zcomp_strm *zcomp_stream_get(struct zcomp *comp)
 {
-	return *get_cpu_ptr(comp->stream);
+	return *per_cpu_ptr(comp->stream, get_cpu_light());
 }
 
 void zcomp_stream_put(struct zcomp *comp)
 {
-	put_cpu_ptr(comp->stream);
+	put_cpu_light();
 }
 
 int zcomp_compress(struct zcomp_strm *zstrm,