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

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Message-ID: <20170628233254.GR6973@jhogan-linux.le.imgtec.org>
Date:   Thu, 29 Jun 2017 00:32:55 +0100
From:   James Hogan <james.hogan@...tec.com>
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>, <tklauser@...tanz.ch>, <will.deacon@....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 Wed, Jun 28, 2017 at 11:55:34AM -0700, Palmer Dabbelt 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 @@
...
> +#ifdef CONFIG_KPROBES
> +#error "RISC-V doesn't skpport CONFIG_KPROBES"
> +#endif

I'm wondering where your fallback definition of e.g. NOKPROBE_SYMBOL
comes from then.

Could you just use the asm-generic one?

> diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
> new file mode 100644
> index 000000000000..b13d3ea3bf79
> --- /dev/null
> +++ b/arch/riscv/kernel/process.c
> @@ -0,0 +1,131 @@
...
> +void show_regs(struct pt_regs *regs)
> +{
> +	show_regs_print_info(KERN_DEFAULT);
> +
> +	printk(KERN_CONT "sepc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
> +		regs->sepc, regs->ra, regs->sp);

I've noticed inconsistent use of pr_* and printk(KERN_* in this
patchset. Maybe now would be the best time to switch everything to pr_*.

> +	/* Reset FPU context
> +	 *	frm: round to nearest, ties to even (IEEE default)
> +	 *	fflags: accrued exceptions cleared
> +	 */

Similarly lots of multiline comments which don't follow the standard
style in Documentation/process/coding-style.rst. Maybe now is the best
time to convert if you're going to.

Cheers
James

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