xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge branch 'rtt-speedup.2020.09.16a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into bpf-next

Browse Source 
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov
2020-09-23 19:32:09 -07:00
parent f00f2f7fe8 f747c7e15d
commit 182bf3f3dd
2 changed files with 45 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/rcupdate_trace.h
View File

@@ -50,6 +50,7 @@ static inline void rcu_read_lock_trace(void)
struct task_struct *t = current;
WRITE_ONCE(t->trc_reader_nesting, READ_ONCE(t->trc_reader_nesting) + 1);
barrier();
if (IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB) &&
t->trc_reader_special.b.need_mb)
smp_mb(); // Pairs with update-side barriers
@@ -72,6 +73,9 @@ static inline void rcu_read_unlock_trace(void)
rcu_lock_release(&rcu_trace_lock_map);
nesting = READ_ONCE(t->trc_reader_nesting) - 1;
barrier(); // Critical section before disabling.
// Disable IPI-based setting of .need_qs.
WRITE_ONCE(t->trc_reader_nesting, INT_MIN);
if (likely(!READ_ONCE(t->trc_reader_special.s)) || nesting) {
WRITE_ONCE(t->trc_reader_nesting, nesting);
return; // We assume shallow reader nesting.