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| author | Paul E. McKenney <paulmck@kernel.org> | 2025-01-08 06:48:15 -0800 |
|---|---|---|
| committer | Boqun Feng <boqun.feng@gmail.com> | 2025-02-05 07:12:05 -0800 |
| commit | 4d86b1e7e1e98eb1f0e3c5a4635a5c37cbd22919 (patch) | |
| tree | 6168181a0fbdc8c7e906975d6d2e88ac06600b15 /kernel/rcu | |
| parent | srcu: Rename srcu_check_read_flavor_lite() to srcu_check_read_flavor_force() (diff) | |
| download | linux-4d86b1e7e1e98eb1f0e3c5a4635a5c37cbd22919.tar.gz linux-4d86b1e7e1e98eb1f0e3c5a4635a5c37cbd22919.zip | |
srcu: Add SRCU_READ_FLAVOR_SLOWGP to flag need for synchronize_rcu()
This commit switches from a direct test of SRCU_READ_FLAVOR_LITE to a new
SRCU_READ_FLAVOR_SLOWGP macro to check for substituting synchronize_rcu()
for smp_mb() in SRCU grace periods. Right now, SRCU_READ_FLAVOR_SLOWGP
is exactly SRCU_READ_FLAVOR_LITE, but the addition of the _fast() flavor
of SRCU will change that.
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 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/srcutree.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index 121dd290cae1..8b5c50bc98e5 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -449,7 +449,7 @@ static bool srcu_readers_lock_idx(struct srcu_struct *ssp, int idx, bool gp, uns } WARN_ONCE(IS_ENABLED(CONFIG_PROVE_RCU) && (mask & (mask - 1)), "Mixed reader flavors for srcu_struct at %ps.\n", ssp); - if (mask & SRCU_READ_FLAVOR_LITE && !gp) + if (mask & SRCU_READ_FLAVOR_SLOWGP && !gp) return false; return sum == unlocks; } @@ -487,7 +487,7 @@ static bool srcu_readers_active_idx_check(struct srcu_struct *ssp, int idx) unsigned long unlocks; unlocks = srcu_readers_unlock_idx(ssp, idx, &rdm); - did_gp = !!(rdm & SRCU_READ_FLAVOR_LITE); + did_gp = !!(rdm & SRCU_READ_FLAVOR_SLOWGP); /* * Make sure that a lock is always counted if the corresponding @@ -1205,7 +1205,7 @@ static bool srcu_should_expedite(struct srcu_struct *ssp) check_init_srcu_struct(ssp); /* If _lite() readers, don't do unsolicited expediting. */ - if (this_cpu_read(ssp->sda->srcu_reader_flavor) & SRCU_READ_FLAVOR_LITE) + if (this_cpu_read(ssp->sda->srcu_reader_flavor) & SRCU_READ_FLAVOR_SLOWGP) return false; /* If the local srcu_data structure has callbacks, not idle. */ sdp = raw_cpu_ptr(ssp->sda); |