kernel/linux.git/tools/sched_ext, branch v7.0-rc7

tools/sched_ext: Add -fms-extensions to bpf build flags

2026-03-03T08:00:23+00:00

Similar to commit 835a50753579 ("selftests/bpf: Add -fms-extensions to bpf build flags") and commit 639f58a0f480 ("bpftool: Fix build warnings due to MS extensions") The kernel is now built with -fms-extensions, therefore generated vmlinux.h contains types like: struct aes_key { struct aes_enckey; union aes_invkey_arch inv_k; }; struct ns_common { ... union { struct ns_tree; struct callback_head ns_rcu; }; }; Which raise warning like below when building scx scheduler: tools/sched_ext/build/include/vmlinux.h:50533:3: warning: declaration does not declare anything [-Wmissing-declarations] 50533 | struct ns_tree; | ^ Fix it by using -fms-extensions and -Wno-microsoft-anon-tag flags to build bpf programs that #include "vmlinux.h" Signed-off-by: Zhao Mengmeng Reviewed-by: Andrea Righi Signed-off-by: Tejun Heo

tools/sched_ext: fix strtoul() misuse in scx_hotplug_seq()

2026-02-27T19:17:44+00:00

scx_hotplug_seq() uses strtoul() but validates the result with a negative check (val < 0), which can never be true for an unsigned return value. Use the endptr mechanism to verify the entire string was consumed, and check errno == ERANGE for overflow detection. Signed-off-by: David Carlier Signed-off-by: Tejun Heo

tools/sched_ext: Add Kconfig to sync with upstream

2026-02-24T17:51:36+00:00

Add the missing Kconfig file to tools/sched_ext/ as referenced in the README. Ref: https://github.com/sched-ext/scx/blob/main/kernel.config Signed-off-by: Cheng-Yang Chou Signed-off-by: Tejun Heo

tools/sched_ext: Sync README.md Kconfig with upstream scx

2026-02-24T17:51:29+00:00

Sync the documentation with the upstream scx repository to reflect the current recommended configuration. Ref: https://github.com/sched-ext/scx/blob/main/README.md#build--install Signed-off-by: Cheng-Yang Chou Signed-off-by: Tejun Heo

tools/sched_ext: scx_sdt: Remove unused '-f' option

2026-02-23T17:45:34+00:00

The '-f' option is defined in getopt() but not handled in the switch statement or documented in the help text. Providing '-f' currently triggers the default error path. Remove it to sync the optstring with the actual implementation. Signed-off-by: Cheng-Yang Chou Signed-off-by: Tejun Heo

tools/sched_ext: scx_central: Remove unused '-p' option

2026-02-23T17:45:30+00:00

The '-p' option is defined in getopt() but not handled in the switch statement or documented in the help text. Providing '-p' currently triggers the default error path. Remove it to sync the optstring with the actual implementation. Signed-off-by: Cheng-Yang Chou Signed-off-by: Tejun Heo

tools/sched_ext: fix getopt not re-parsed on restart

2026-02-21T03:17:38+00:00

After goto restart, optind retains its advanced position from the previous getopt loop, causing getopt() to immediately return -1. This silently drops all command-line options on the restarted skeleton. Reset optind to 1 at the restart label so options are re-parsed. Affected schedulers: scx_simple, scx_central, scx_flatcg, scx_pair, scx_sdt, scx_cpu0. Signed-off-by: David Carlier Signed-off-by: Tejun Heo

tools/sched_ext: scx_userland: fix data races on shared counters

2026-02-21T03:17:31+00:00

The stats thread reads nr_vruntime_enqueues, nr_vruntime_dispatches, nr_vruntime_failed, and nr_curr_enqueued concurrently with the main thread writing them, with no synchronization. Use __atomic builtins with relaxed ordering for all accesses to these counters to eliminate the data races. Only display accuracy is affected, not scheduling correctness. Signed-off-by: David Carlier Signed-off-by: Tejun Heo

tools/sched_ext: scx_pair: fix stride == 0 crash on single-CPU systems

2026-02-18T17:03:57+00:00

nr_cpu_ids / 2 produces stride 0 on a single-CPU system, which later causes SCX_BUG_ON(i == j) to fire. Validate stride after option parsing to also catch invalid user-supplied values via -S. Signed-off-by: David Carlier Signed-off-by: Tejun Heo

tools/sched_ext: scx_central: fix CPU_SET and skeleton leak on early exit

2026-02-18T17:03:50+00:00

Use CPU_SET_S() instead of CPU_SET() on the dynamically allocated cpuset to avoid a potential out-of-bounds write when nr_cpu_ids exceeds CPU_SETSIZE. Also destroy the skeleton before returning on invalid central CPU ID to prevent a resource leak. Signed-off-by: David Carlier Signed-off-by: Tejun Heo