Hello Mao Han, On Thu, 29 Aug 2019, Mao Han wrote: > This patch implements the perf registers sampling and validation API > for riscv arch. The valid registers and their register ID are defined in > perf_regs.h. Perf tool can backtrace in userspace with unwind library > and the registers/user stack dump support. [ ... ] > diff --git a/arch/riscv/include/uapi/asm/perf_regs.h b/arch/riscv/include/uapi/asm/perf_regs.h > new file mode 100644 > index 0000000..df1a581 > --- /dev/null > +++ b/arch/riscv/include/uapi/asm/perf_regs.h > @@ -0,0 +1,42 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ All of the other Linux architectures use "GPL-2.0 WITH Linux-syscall-note" for their license for the perf uapi files. Could you please change this license string to match the standard Linux practice? Then I think it should be good to merge. - Paul