Re: [PATCH v3 4/7] riscv: Clear pending IPIs on initialization

Even though we no longer call smp_function if an IPI was not sent by U-Boot, we still need to clear any IPIs which were pending from the execution environment. Otherwise, secondary harts will busy-wait in secondary_hart_loop, instead of relaxing.

Along with the previous commit ("riscv: Use a valid bit to ignore already-pending IPIs"), this fixes SMP booting on the Kendryte K210.

Signed-off-by: Sean Anderson seanga2@gmail.com Reviewed-by: Bin Meng bin.meng@windriver.com

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Changes in v3:

• Rename riscv_ipi_init_secondary_hart to dummy_pending_ipi_clear
• Only compile dummy_pending_ipi_clear when SMP is enabled

Changes in v2:

• Make riscv_ipi_init_secondary_hart static

arch/riscv/cpu/cpu.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)

Reviewed-by: Rick Chen rick@andestech.com