linux-kernel - [PATCH] sched_ext: Make scx_bpf_cpuperf

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Date: Sun, 23 Jun 2024 03:10:36 -0500
From: David Vernet <void@...ifault.com>
To: tj@...nel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: [PATCH] sched_ext: Make scx_bpf_cpuperf_set() @cpu arg signed

The scx_bpf_cpuperf_set() kfunc allows a BPF program to set the relative
performance target of a specified CPU. Commit d86adb4fc065 ("sched_ext: Add
cpuperf support") defined the @cpu argument to be unsigned. Let's update it
to be signed to match the norm for the rest of ext.c and the kernel.

Note that the kfunc declaration of scx_bpf_cpuperf_set() in the
common.bpf.h header in tools/sched_ext already listed the cpu as signed, so
this also fixes the build for tools/sched_ext and the sched_ext selftests
due to kfunc declarations now being emitted in vmlinux.h based on BTF (thus
causing the compiler to error due to observing conflicting types).

Fixes: d86adb4fc065 ("sched_ext: Add cpuperf support")
Signed-off-by: David Vernet <void@...ifault.com>
---
 kernel/sched/ext.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 28f7a4266fde..8e8b44f2c74a 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -5893,7 +5893,7 @@ __bpf_kfunc u32 scx_bpf_cpuperf_cur(s32 cpu)
  * use. Consult hardware and cpufreq documentation for more information. The
  * current performance level can be monitored using scx_bpf_cpuperf_cur().
  */
-__bpf_kfunc void scx_bpf_cpuperf_set(u32 cpu, u32 perf)
+__bpf_kfunc void scx_bpf_cpuperf_set(s32 cpu, u32 perf)
 {
 	if (unlikely(perf > SCX_CPUPERF_ONE)) {
 		scx_ops_error("Invalid cpuperf target %u for CPU %d", perf, cpu);
-- 
2.45.2