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[Qemu-devel] [PATCH v3 07/15] qom/cpu: atomically clear the tb_jmp_cache


From: Alex Bennée
Subject: [Qemu-devel] [PATCH v3 07/15] qom/cpu: atomically clear the tb_jmp_cache
Date: Fri, 30 Sep 2016 22:30:58 +0100

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

Signed-off-by: Alex Bennée <address@hidden>
---
 qom/cpu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/qom/cpu.c b/qom/cpu.c
index 484c493..ef905da 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -253,6 +253,7 @@ void cpu_reset(CPUState *cpu)
 static void cpu_common_reset(CPUState *cpu)
 {
     CPUClass *cc = CPU_GET_CLASS(cpu);
+    int i;
 
     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
         qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
@@ -268,7 +269,10 @@ static void cpu_common_reset(CPUState *cpu)
     cpu->can_do_io = 1;
     cpu->exception_index = -1;
     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)
-- 
2.9.3




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