RISC-V: Use a local variable instead of smp_processor_id()

Store the smp_processor_id() in a local variable to save some
pointer chasing.

Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 4e9922790f6eac76ef641feae8d5b07f8adccf52..3e033e97dd083ecb6a0ffc193d50e8d1ddad1849 100644 (file)
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -146,6 +146,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
 asmlinkage __visible void smp_callin(void)
 {
        struct mm_struct *mm = &init_mm;
+       unsigned int curr_cpuid = smp_processor_id();
 
        if (!IS_ENABLED(CONFIG_RISCV_SBI))
                clint_clear_ipi(cpuid_to_hartid_map(smp_processor_id()));
@@ -155,9 +156,9 @@ asmlinkage __visible void smp_callin(void)
        current->active_mm = mm;
 
        trap_init();
-       notify_cpu_starting(smp_processor_id());
-       update_siblings_masks(smp_processor_id());
-       set_cpu_online(smp_processor_id(), 1);
+       notify_cpu_starting(curr_cpuid);
+       update_siblings_masks(curr_cpuid);
+       set_cpu_online(curr_cpuid, 1);
        /*
         * Remote TLB flushes are ignored while the CPU is offline, so emit
         * a local TLB flush right now just in case.