diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2025-01-08 14:31:27 -0800 |
|---|---|---|
| committer | Boqun Feng <boqun.feng@gmail.com> | 2025-02-05 07:12:05 -0800 |
| commit | f4bde41dd19db5e2ea9e0b4a19ac2573f7244d03 (patch) | |
| tree | 423d501912f23c9be906aa291319a55befd5c0ad /include/linux/srcutree.h | |
| parent | 4d86b1e7e1e98eb1f0e3c5a4635a5c37cbd22919 (diff) | |
srcu: Pull pointer-to-integer conversion into __srcu_ptr_to_ctr()
This commit abstracts the srcu_read_lock*() pointer-to-integer conversion
into a new __srcu_ptr_to_ctr(). This will be used in rcutorture for
testing an srcu_read_lock_fast() that returns a pointer rather than
an integer.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: <bpf@vger.kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Diffstat (limited to 'include/linux/srcutree.h')
| -rw-r--r-- | include/linux/srcutree.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h index e29cc57eac81..f41bb3a55a04 100644 --- a/include/linux/srcutree.h +++ b/include/linux/srcutree.h @@ -211,6 +211,13 @@ void synchronize_srcu_expedited(struct srcu_struct *ssp); void srcu_barrier(struct srcu_struct *ssp); void srcu_torture_stats_print(struct srcu_struct *ssp, char *tt, char *tf); +// Converts a per-CPU pointer to an ->srcu_ctrs[] array element to that +// element's index. +static inline bool __srcu_ptr_to_ctr(struct srcu_struct *ssp, struct srcu_ctr __percpu *scpp) +{ + return scpp - &ssp->sda->srcu_ctrs[0]; +} + /* * Counts the new reader in the appropriate per-CPU element of the * srcu_struct. Returns an index that must be passed to the matching @@ -228,7 +235,7 @@ static inline int __srcu_read_lock_lite(struct srcu_struct *ssp) RCU_LOCKDEP_WARN(!rcu_is_watching(), "RCU must be watching srcu_read_lock_lite()."); this_cpu_inc(scp->srcu_locks.counter); /* Y */ barrier(); /* Avoid leaking the critical section. */ - return scp - &ssp->sda->srcu_ctrs[0]; + return __srcu_ptr_to_ctr(ssp, scp); } /* |