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atomics: eliminate mb_read/mb_set

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qatomic_mb_read and qatomic_mb_set were the very first atomic primitives
introduced for QEMU; their semantics are unclear and they provide a false
sense of safety.

The last use of qatomic_mb_read() has been removed, so delete it.
qatomic_mb_set() instead can survive as an optimized
qatomic_set()+smp_mb(), similar to Linux's smp_store_mb(), but
rename it to qatomic_set_mb() to match the order of the two
operations.

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 14:37:51 +01:00
parent 09a49afeae
commit 06831001ac
11 changed files with 20 additions and 46 deletions
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2
softmmu/cpus.c
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@ -405,7 +405,7 @@ static void qemu_cpu_stop(CPUState *cpu, bool exit)
void qemu_wait_io_event_common(CPUState *cpu)
{
qatomic_mb_set(&cpu->thread_kicked, false);
qatomic_set_mb(&cpu->thread_kicked, false);
if (cpu->stop) {
qemu_cpu_stop(cpu, false);
}