[PATCH v6 06/14] RISC-V: Provide a cleaner raw_smp_processor_id()

Atish Patra atish.patra at wdc.com
Tue Oct 2 12:14:59 PDT 2018

From: Palmer Dabbelt <palmer at sifive.com>

I'm not sure how I managed to miss this the first time, but this is much

Signed-off-by: Palmer Dabbelt <palmer at sifive.com>
[Atish: code comment formatting and other fixes]
Signed-off-by: Atish Patra <atish.patra at wdc.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
 arch/riscv/include/asm/smp.h | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
index 36016845..85d7619e 100644
--- 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. */
-#include <asm/asm-offsets.h>
 #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 */

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