diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2025-12-15 17:52:06 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-01-22 11:11:16 +0100 |
| commit | f8380f976804533df4c6c3d3a0b2cd03c2d262bc (patch) | |
| tree | a575c2e92d8ee13ee36669b815113810110285f4 /include | |
| parent | d7a5da7a0f7fa7ff081140c4f6f971db98882703 (diff) | |
rseq: Provide static branch for time slice extensions
Guard the time slice extension functionality with a static key, which can
be disabled on the kernel command line.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251215155708.733429292@linutronix.de
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/rseq_entry.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/rseq_entry.h b/include/linux/rseq_entry.h index a36b472627de..d0ec4714ffd6 100644 --- a/include/linux/rseq_entry.h +++ b/include/linux/rseq_entry.h @@ -75,6 +75,17 @@ DECLARE_STATIC_KEY_MAYBE(CONFIG_RSEQ_DEBUG_DEFAULT_ENABLE, rseq_debug_enabled); #define rseq_inline __always_inline #endif +#ifdef CONFIG_RSEQ_SLICE_EXTENSION +DECLARE_STATIC_KEY_TRUE(rseq_slice_extension_key); + +static __always_inline bool rseq_slice_extension_enabled(void) +{ + return static_branch_likely(&rseq_slice_extension_key); +} +#else /* CONFIG_RSEQ_SLICE_EXTENSION */ +static inline bool rseq_slice_extension_enabled(void) { return false; } +#endif /* !CONFIG_RSEQ_SLICE_EXTENSION */ + bool rseq_debug_update_user_cs(struct task_struct *t, struct pt_regs *regs, unsigned long csaddr); bool rseq_debug_validate_ids(struct task_struct *t); |