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rcu: remove qatomic_mb_set, expand comments

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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-03-03 13:46:03 +01:00
parent 792f77f376
commit 6e288b00ef
2 changed files with 15 additions and 14 deletions
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5
include/qemu/rcu.h
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@ -87,7 +87,10 @@ static inline void rcu_read_lock(void)
ctr = qatomic_read(&rcu_gp_ctr);
qatomic_set(&p_rcu_reader->ctr, ctr);
/* Write p_rcu_reader->ctr before reading RCU-protected pointers. */
/*
* Read rcu_gp_ptr and write p_rcu_reader->ctr before reading
* RCU-protected pointers.
*/
smp_mb_placeholder();
}