Upstream-PR: https://github.com/sched-ext/scx/pull/1860

From 47622a1081ff849d224dc925752a4d860c217c4e Mon Sep 17 00:00:00 2001
From: Violet Purcell <vimproved@inventati.org>
Date: Sun, 11 May 2025 16:08:49 -0400
Subject: [PATCH] scx_utils: cast ioctl opcodes to libc::Ioctl

The opcode type that ioctl() accepts can differ between platforms,
namely between glibc where it accepts an unsigned 32-bit int, and musl
where it accepts a signed 32-bit int. Either way, the underlying value
of the opcode is a 32-bit integer. Currently, bindgen is storing the
enum values defined in perf_bindings.h as u32, which is fine for glibc,
but not musl (which wants an i32). This commit casts the opcodes to
libc::Ioctl before passing them to fix this.
--- a/rust/scx_utils/src/perf.rs
+++ b/rust/scx_utils/src/perf.rs
@@ -52,11 +52,11 @@ pub mod ioctls {
 
     #[allow(clippy::missing_safety_doc)]
     pub unsafe fn enable(fd: c_int, arg: c_uint) -> c_int {
-        unsafe { libc::ioctl(fd, perf::bindings::ENABLE.into(), arg) }
+        unsafe { libc::ioctl(fd, perf::bindings::ENABLE as libc::Ioctl, arg) }
     }
 
     #[allow(clippy::missing_safety_doc)]
     pub unsafe fn reset(fd: c_int, arg: c_uint) -> c_int {
-        unsafe { libc::ioctl(fd, perf::bindings::RESET.into(), arg) }
+        unsafe { libc::ioctl(fd, perf::bindings::RESET as libc::Ioctl, arg) }
     }
 }
-- 
2.49.0