linux-kernel - [PATCH 1/2] blk-wbt: Use tracepoint_string() for wbt

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Date:   Fri, 17 Apr 2020 16:00:22 +0300
From:   Tommi Rantala <tommi.t.rantala@...ia.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Tommi Rantala <tommi.t.rantala@...ia.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] blk-wbt: Use tracepoint_string() for wbt_step tracepoint string literals

Use tracepoint_string() for string literals that are used in the
wbt_step tracepoint, so that userspace tools can display the string
content.

Signed-off-by: Tommi Rantala <tommi.t.rantala@...ia.com>
---
 block/blk-wbt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index 8641ba9793c5..9cb082f38b93 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -313,7 +313,7 @@ static void scale_up(struct rq_wb *rwb)
 	calc_wb_limits(rwb);
 	rwb->unknown_cnt = 0;
 	rwb_wake_all(rwb);
-	rwb_trace_step(rwb, "scale up");
+	rwb_trace_step(rwb, tracepoint_string("scale up"));
 }
 
 static void scale_down(struct rq_wb *rwb, bool hard_throttle)
@@ -322,7 +322,7 @@ static void scale_down(struct rq_wb *rwb, bool hard_throttle)
 		return;
 	calc_wb_limits(rwb);
 	rwb->unknown_cnt = 0;
-	rwb_trace_step(rwb, "scale down");
+	rwb_trace_step(rwb, tracepoint_string("scale down"));
 }
 
 static void rwb_arm_timer(struct rq_wb *rwb)
-- 
2.25.2