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rseq: Make exit debugging static branch based 

Disconnect it from the config switch and use the static debug branch. This
is a temporary measure for validating the rework. At the end this check
needs to be hidden behind lockdep as it has nothing to do with the other
debug infrastructure, which mainly aids user space debugging by enabling a
zoo of checks which terminate misbehaving tasks instead of letting them
keep the hard to diagnose pieces.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/20251027084307.272660745@linutronix.de
This commit is contained in:
Thomas Gleixner 2025-10-27 09:45:02 +01:00 committed by Ingo Molnar
parent f7ee1964ac
commit c1cbad8f99
1 changed files with 1 additions and 1 deletions
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include/linux/rseq_entry.h
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@ -285,7 +285,7 @@ static __always_inline void rseq_exit_to_user_mode(void)
rseq_stat_inc(rseq_stats.exit);
if (IS_ENABLED(CONFIG_DEBUG_RSEQ))
if (static_branch_unlikely(&rseq_debug_enabled))
WARN_ON_ONCE(ev->sched_switch);
/*