bpf: Remove unused variable "prev_state"

The variable "prev_state" is not used for any actual operations

v2: Fix commit message and description.

Signed-off-by: Ying Zhang <yingzhang098@163.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/bpf/20240521161702.4339-1-yingzhang098@163.com

diff --git a/samples/bpf/cpustat_kern.c b/samples/bpf/cpustat_kern.c
index 944f13f..7ec7143 100644 (file)
--- a/samples/bpf/cpustat_kern.c
+++ b/samples/bpf/cpustat_kern.c
@@ -211,7 +211,7 @@ int bpf_prog1(struct cpu_args *ctx)
 SEC("tracepoint/power/cpu_frequency")
 int bpf_prog2(struct cpu_args *ctx)
 {
-       u64 *pts, *cstate, *pstate, prev_state, cur_ts, delta;
+       u64 *pts, *cstate, *pstate, cur_ts, delta;
        u32 key, cpu, pstate_idx;
        u64 *val;
 
@@ -232,7 +232,6 @@ int bpf_prog2(struct cpu_args *ctx)
        if (!cstate)
                return 0;
 
-       prev_state = *pstate;
        *pstate = ctx->state;
 
        if (!*pts) {