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由 Miao Yan 提交于
When running SMP configuration on QEMU (tcg mode, no kvm), there is a busy loop in start_aps(), calling udelay(), that waits for APs to show up online. However, there is a chance that VCPU1 will be timeout waiting, IOW the secondary VCPUs haven't started their execution yet. This patch adds a 'pause' instruction in __udelay() only for QEMU target, to give other VCPUs a chance to run. When QEMU sees the 'pause' instruction, it will yeild the execution to other CPUs. Signed-off-by: NMiao Yan <yanmiaobest@gmail.com> Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Acked-by: NSimon Glass <sjg@chromium.org> Tested-by: NSimon Glass <sjg@chromium.org>
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