linux-kernel - Re: [PATCH 5/9] RISC-V: Task implementation

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Date:   Thu, 29 Jun 2017 10:22:23 +0200
From:   Tobias Klauser <tklauser@...tanz.ch>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     peterz@...radead.org, mingo@...hat.com, mcgrof@...nel.org,
        viro@...iv.linux.org.uk, sfr@...b.auug.org.au,
        nicolas.dichtel@...nd.com, rmk+kernel@...linux.org.uk,
        msalter@...hat.com, will.deacon@....com, james.hogan@...tec.com,
        paul.gortmaker@...driver.com, linux@...ck-us.net,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        albert@...ive.com
Subject: Re: [PATCH 5/9] RISC-V: Task implementation

On 2017-06-28 at 20:55:34 +0200, Palmer Dabbelt <palmer@...belt.com> wrote:
[...]
> diff --git a/arch/riscv/include/asm/kprobes.h b/arch/riscv/include/asm/kprobes.h
> new file mode 100644
> index 000000000000..1190de7a0f74
> --- /dev/null
> +++ b/arch/riscv/include/asm/kprobes.h
> @@ -0,0 +1,22 @@
> +/*
> + * Copyright (C) 2017 SiFive
> + *
> + *   This program is free software; you can redistribute it and/or
> + *   modify it under the terms of the GNU General Public License
> + *   as published by the Free Software Foundation, version 2.
> + *
> + *   This program is distributed in the hope that it will be useful,
> + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *   GNU General Public License for more details.
> + */
> +
> +
> +#ifndef ASM_RISCV_KPROBES_H
> +#define ASM_RISCV_KPROBES_H
> +
> +#ifdef CONFIG_KPROBES
> +#error "RISC-V doesn't skpport CONFIG_KPROBES"

Typo: s/skpport/support/

> +#endif
> +
> +#endif
> diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
> new file mode 100644
> index 000000000000..65aa014db9b4
> --- /dev/null
> +++ b/arch/riscv/include/asm/processor.h
> @@ -0,0 +1,102 @@
> +/*
> + * Copyright (C) 2012 Regents of the University of California
> + *
> + *   This program is free software; you can redistribute it and/or
> + *   modify it under the terms of the GNU General Public License
> + *   as published by the Free Software Foundation, version 2.
> + *
> + *   This program is distributed in the hope that it will be useful,
> + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *   GNU General Public License for more details.
> + */
> +
> +#ifndef _ASM_RISCV_PROCESSOR_H
> +#define _ASM_RISCV_PROCESSOR_H
> +
> +#include <linux/const.h>
> +
> +#include <asm/ptrace.h>
> +
> +/*
> + * This decides where the kernel will search for a free chunk of vm
> + * space during mmap's.
> + */
> +#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE >> 1)
> +
> +#ifdef __KERNEL__
> +#define STACK_TOP		TASK_SIZE
> +#define STACK_TOP_MAX		STACK_TOP
> +#define STACK_ALIGN		16
> +#endif /* __KERNEL__ */
> +
> +#ifndef __ASSEMBLY__
> +
> +struct task_struct;
> +struct pt_regs;
> +
> +/*
> + * Default implementation of macro that returns current
> + * instruction pointer ("program counter").
> + */
> +#define current_text_addr()	({ __label__ _l; _l: &&_l; })
> +
> +/* CPU-specific state of a task */
> +struct thread_struct {
> +	/* Callee-saved registers */
> +	unsigned long ra;
> +	unsigned long sp;	/* Kernel mode stack */
> +	unsigned long s[12];	/* s[0]: frame pointer */
> +	struct __riscv_d_ext_state fstate;
> +};
> +
> +#define INIT_THREAD {					\
> +	.sp = sizeof(init_stack) + (long)&init_stack,	\
> +}
> +
> +/* Return saved (kernel) PC of a blocked thread. */
> +#define thread_saved_pc(t)	((t)->thread.ra)
> +#define thread_saved_sp(t)	((t)->thread.sp)
> +#define thread_saved_fp(t)	((t)->thread.s[0])

These aren't needed outside of arch-specific code (anymore) and the
riscv port doesn't seem to be using them, so they can be omitted.