RISC-V: Provide a cleaner raw_smp_processor_id()

palmer-dabbelt · palmer-dabbelt · commit 9639a44394b9 · 2018-10-22T17:03:36.000-07:00
I'm not sure how I managed to miss this the first time, but this is much
better.

Signed-off-by: Palmer Dabbelt &lt;palmer@sifive.com&gt;
[Atish: code comment formatting and other fixes]
Signed-off-by: Atish Patra &lt;atish.patra@wdc.com&gt;
Reviewed-by: Christoph Hellwig &lt;hch@lst.de&gt;
Signed-off-by: Palmer Dabbelt &lt;palmer@sifive.com&gt;
diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
@@ -14,13 +14,9 @@
 #ifndef _ASM_RISCV_SMP_H
 #define _ASM_RISCV_SMP_H
 
-/* This both needs asm-offsets.h and is used when generating it. */
-#ifndef GENERATING_ASM_OFFSETS
-#include <asm/asm-offsets.h>
-#endif
-
 #include <linux/cpumask.h>
 #include <linux/irqreturn.h>
+#include <linux/thread_info.h>
 
 #ifdef CONFIG_SMP
 
@@ -34,12 +30,10 @@ void arch_send_call_function_ipi_mask(struct cpumask *mask);
 void arch_send_call_function_single_ipi(int cpu);
 
 /*
- * This is particularly ugly: it appears we can't actually get the definition
- * of task_struct here, but we need access to the CPU this task is running on.
- * Instead of using C we're using asm-offsets.h to get the current processor
- * ID.
+ * Obtains the hart ID of the currently executing task.  This relies on
+ * THREAD_INFO_IN_TASK, but we define that unconditionally.
  */
-#define raw_smp_processor_id() (*((int*)((char*)get_current() + TASK_TI_CPU)))
+#define raw_smp_processor_id() (current_thread_info()->cpu)
 
 #endif /* CONFIG_SMP */
 
