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qom/cpu: atomically clear the tb_jmp_cache

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The ThreadSanitizer rightly complains that something initialised with a
normal access is later updated and read atomically.

Backports commit ce7cf6a973f4b614162b9518954d441fa5e32fc6 from qemu
This commit is contained in:
Alex Bennée 2018-02-26 05:08:12 -05:00 committed by Lioncash
parent 12d7e946a1
commit e1cf9ca84a
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 5 additions and 1 deletions
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6
qemu/qom/cpu.c
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@ -155,6 +155,7 @@ void cpu_reset(CPUState *cpu)
static void cpu_common_reset(CPUState *cpu) static void cpu_common_reset(CPUState *cpu)
{ {
CPUClass *cc = CPU_GET_CLASS(cpu->uc, cpu); CPUClass *cc = CPU_GET_CLASS(cpu->uc, cpu);
int i;
if (qemu_loglevel_mask(CPU_LOG_RESET)) { if (qemu_loglevel_mask(CPU_LOG_RESET)) {
qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index); qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
@ -170,7 +171,10 @@ static void cpu_common_reset(CPUState *cpu)
cpu->can_do_io = 0; cpu->can_do_io = 0;
cpu->exception_index = -1; cpu->exception_index = -1;
cpu->crash_occurred = false; cpu->crash_occurred = false;
memset(cpu->tb_jmp_cache, 0, TB_JMP_CACHE_SIZE * sizeof(void *));
for (i = 0; i < TB_JMP_CACHE_SIZE; ++i) {
atomic_set(&cpu->tb_jmp_cache[i], NULL);
}
} }
static bool cpu_common_has_work(CPUState *cs) static bool cpu_common_has_work(CPUState *cs)