arm64: perf: Remove redundant initialization in perf_event.c

The initialization of value in function armv8pmu_read_hw_counter()
and armv8pmu_read_counter() seem redundant, as they are soon updated.
So, We can remove them.

Signed-off-by: Qi Liu <liuqi115@huawei.com>
Link: https://lore.kernel.org/r/1617275801-1980-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 4658fcf..f594957 100644 (file)
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -470,9 +470,8 @@ static inline u64 armv8pmu_read_evcntr(int idx)
 static inline u64 armv8pmu_read_hw_counter(struct perf_event *event)
 {
        int idx = event->hw.idx;
-       u64 val = 0;
+       u64 val = armv8pmu_read_evcntr(idx);
 
-       val = armv8pmu_read_evcntr(idx);
        if (armv8pmu_event_is_chained(event))
                val = (val << 32) | armv8pmu_read_evcntr(idx - 1);
        return val;
@@ -520,7 +519,7 @@ static u64 armv8pmu_read_counter(struct perf_event *event)
 {
        struct hw_perf_event *hwc = &event->hw;
        int idx = hwc->idx;
-       u64 value = 0;
+       u64 value;
 
        if (idx == ARMV8_IDX_CYCLE_COUNTER)
                value = read_sysreg(pmccntr_el0);