[PATCH v2 2/3] drivers/perf: convert sysfs scnprintf family to sysfs_emit_at() and sysfs_emit()

[Qi Liu]

Use the generic sysfs_emit_at() and sysfs_emit() function to take place
of scnprintf()

Signed-off-by: Qi Liu <liuqi...@huawei.com>
---
 drivers/perf/arm-ccn.c | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c
index 3a2ddc0..96d47cb 100644
--- a/drivers/perf/arm-ccn.c
+++ b/drivers/perf/arm-ccn.c
@@ -326,43 +326,38 @@ static ssize_t arm_ccn_pmu_event_show(struct device *dev,
        struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev));
        struct arm_ccn_pmu_event *event = container_of(attr,
                        struct arm_ccn_pmu_event, attr);
-       ssize_t res;
+       int res;
 
-       res = scnprintf(buf, PAGE_SIZE, "type=0x%x", event->type);
+       res = sysfs_emit(buf, "type=0x%x", event->type);
        if (event->event)
-               res += scnprintf(buf + res, PAGE_SIZE - res, ",event=0x%x",
-                               event->event);
+               res += sysfs_emit_at(buf, res, ",event=0x%x", event->event);
        if (event->def)
-               res += scnprintf(buf + res, PAGE_SIZE - res, ",%s",
-                               event->def);
+               res += sysfs_emit_at(buf, res, ",%s", event->def);
        if (event->mask)
-               res += scnprintf(buf + res, PAGE_SIZE - res, ",mask=0x%x",
-                               event->mask);
+               res += sysfs_emit_at(buf, res, ",mask=0x%x", event->mask);
 
        /* Arguments required by an event */
        switch (event->type) {
        case CCN_TYPE_CYCLES:
                break;
        case CCN_TYPE_XP:
-               res += scnprintf(buf + res, PAGE_SIZE - res,
-                               ",xp=?,vc=?");
+               res += sysfs_emit_at(buf, res, ",xp=?,vc=?");
                if (event->event == CCN_EVENT_WATCHPOINT)
-                       res += scnprintf(buf + res, PAGE_SIZE - res,
+                       res += sysfs_emit_at(buf, res,
                                        ",port=?,dir=?,cmp_l=?,cmp_h=?,mask=?");
                else
-                       res += scnprintf(buf + res, PAGE_SIZE - res,
-                                       ",bus=?");
+                       res += sysfs_emit_at(buf, res, ",bus=?");
 
                break;
        case CCN_TYPE_MN:
-               res += scnprintf(buf + res, PAGE_SIZE - res, ",node=%d", 
ccn->mn_id);
+               res += sysfs_emit_at(buf, res, ",node=%d", ccn->mn_id);
                break;
        default:
-               res += scnprintf(buf + res, PAGE_SIZE - res, ",node=?");
+               res += sysfs_emit_at(buf, res, ",node=?");
                break;
        }
 
-       res += scnprintf(buf + res, PAGE_SIZE - res, "\n");
+       res += sysfs_emit_at(buf, res, "\n");
 
        return res;
 }
-- 
2.8.1