riscv: Add license to fence.h

Add a missing license to fence.h.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20240729-riscv_fence_license-v1-1-7d5648069640@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/arch/riscv/include/asm/fence.h b/arch/riscv/include/asm/fence.h
index 6bcd80325dfc1724aee2e5863ba39881ebea120b..182db7930edc2214b51f747abc906dac207052ef 100644 (file)
--- a/arch/riscv/include/asm/fence.h
+++ b/arch/riscv/include/asm/fence.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef _ASM_RISCV_FENCE_H
 #define _ASM_RISCV_FENCE_H