sched_ext: Fix timer pinning and return value in scx_central

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central_timerfn() re-arms the timer with a hardcoded
BPF_F_TIMER_CPU_PIN flag and ignores the return value, defeating
start_central_timer()'s -EINVAL fallback for kernels without the flag
(<6.7): on such kernels the first tick kills the timer permanently
with no diagnostic.  Honor timer_pinned and check the return like
the initial arm does.

Fixes: 22a920209a ("sched_ext: Implement tickless support")
Signed-off-by: Wanwu Li <liwanwu@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Wanwu Li 2026-08-27 16:07:36 +08:00 • committed by Tejun Heo

parent 6586705bc2

commit 2376135986

1 changed files with 5 additions and 1 deletions

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tools/sched_ext/scx_central.bpf.c

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