diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2022-09-19 14:03:07 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-10-20 15:02:15 -0700 |
| commit | 27120e7d2c4d5c438b76f9c6330037a52ad0722e (patch) | |
| tree | eee74a59c913407dd4956937a3af5710886ee3bd /include/linux/srcutree.h | |
| parent | 2e83b879fb91dafe995967b46a1d38a5b0889242 (diff) | |
| download | lwn-27120e7d2c4d5c438b76f9c6330037a52ad0722e.tar.gz lwn-27120e7d2c4d5c438b76f9c6330037a52ad0722e.zip | |
srcu: Check for consistent per-CPU per-srcu_struct NMI safety
This commit adds runtime checks to verify that a given srcu_struct uses
consistent NMI-safe (or not) read-side primitives on a per-CPU basis.
Link: https://lore.kernel.org/all/20220910221947.171557773@linutronix.de/
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'include/linux/srcutree.h')
| -rw-r--r-- | include/linux/srcutree.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h index 0c4eca07d78d..1ef8f2a4884f 100644 --- a/include/linux/srcutree.h +++ b/include/linux/srcutree.h @@ -25,6 +25,7 @@ struct srcu_data { /* Read-side state. */ atomic_long_t srcu_lock_count[2]; /* Locks per CPU. */ atomic_long_t srcu_unlock_count[2]; /* Unlocks per CPU. */ + int srcu_nmi_safety; /* NMI-safe srcu_struct structure? */ /* Update-side state. */ spinlock_t __private lock ____cacheline_internodealigned_in_smp; @@ -42,6 +43,10 @@ struct srcu_data { struct srcu_struct *ssp; }; +#define SRCU_NMI_UNKNOWN 0x0 +#define SRCU_NMI_NMI_UNSAFE 0x1 +#define SRCU_NMI_NMI_SAFE 0x2 + /* * Node in SRCU combining tree, similar in function to rcu_data. */ |