blk-iolatency: remove set but not used variables 'changed' and 'blkiolat'

Fixes gcc '-Wunused-but-set-variable' warning:

block/blk-iolatency.c: In function 'scale_change':
block/blk-iolatency.c:301:7: warning:
 variable 'changed' set but not used [-Wunused-but-set-variable]

block/blk-iolatency.c: In function 'iolatency_set_limit':
block/blk-iolatency.c:765:24: warning:
 variable 'blkiolat' set but not used [-Wunused-but-set-variable]

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index 19923f8..a6f2152 100644 (file)
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -298,7 +298,6 @@ static void scale_change(struct iolatency_grp *iolat, bool up)
        unsigned long qd = blk_queue_depth(iolat->blkiolat->rqos.q);
        unsigned long scale = scale_amount(qd, up);
        unsigned long old = iolat->rq_depth.max_depth;
-       bool changed = false;
 
        if (old > qd)
                old = qd;
@@ -308,7 +307,6 @@ static void scale_change(struct iolatency_grp *iolat, bool up)
                        return;
 
                if (old < qd) {
-                       changed = true;
                        old += scale;
                        old = min(old, qd);
                        iolat->rq_depth.max_depth = old;
@@ -316,7 +314,6 @@ static void scale_change(struct iolatency_grp *iolat, bool up)
                }
        } else if (old > 1) {
                old >>= 1;
-               changed = true;
                iolat->rq_depth.max_depth = max(old, 1UL);
        }
 }
@@ -761,7 +758,6 @@ static ssize_t iolatency_set_limit(struct kernfs_open_file *of, char *buf,
 {
        struct blkcg *blkcg = css_to_blkcg(of_css(of));
        struct blkcg_gq *blkg;
-       struct blk_iolatency *blkiolat;
        struct blkg_conf_ctx ctx;
        struct iolatency_grp *iolat;
        char *p, *tok;
@@ -774,7 +770,6 @@ static ssize_t iolatency_set_limit(struct kernfs_open_file *of, char *buf,
                return ret;
 
        iolat = blkg_to_lat(ctx.blkg);
-       blkiolat = iolat->blkiolat;
        p = ctx.body;
 
        ret = -EINVAL;