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From: Palmer Dabbelt <palmerdabbelt@google.com>
To: wangkefeng.wang@huawei.com
Cc: linux-riscv@lists.infradead.org, aou@eecs.berkeley.edu,
	wangkefeng.wang@huawei.com, john.ogness@linutronix.de,
	Paul Walmsley <paul.walmsley@sifive.com>
Subject: Re: [PATCH v2] riscv: Using printk directly in __show_regs
Date: Thu, 10 Dec 2020 17:43:41 -0800 (PST)	[thread overview]
Message-ID: <mhng-749d2791-936b-493d-9b8b-89dfea7ec9da@palmerdabbelt-glaptop1> (raw)
In-Reply-To: <20201126133338.125608-1-wangkefeng.wang@huawei.com>

On Thu, 26 Nov 2020 05:33:38 PST (-0800), wangkefeng.wang@huawei.com wrote:
> Covert bulk of pr_cont("...\n") to separate printk calls.
>
> Note that a pr_cont() message with a trailing newline will
> "terminate" the continous line so that it can no longer be
> continued, also it is possible to sort out simultaneous dumps
> from multiple CPUs with CONFIG_PRINTK_CALLER enabled.
>
> And align the printing formats.
>
> Suggested-by: John Ogness <john.ogness@linutronix.de>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> ---
>  arch/riscv/kernel/process.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
> index e41b733abeaa..2119d49feea5 100644
> --- a/arch/riscv/kernel/process.c
> +++ b/arch/riscv/kernel/process.c
> @@ -44,30 +44,30 @@ void __show_regs(struct pt_regs *regs)
>  {
>  	show_regs_print_info(KERN_DEFAULT);
>
> -	pr_cont("epc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
> +	printk("epc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
>  		regs->epc, regs->ra, regs->sp);
> -	pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
> +	printk("gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
>  		regs->gp, regs->tp, regs->t0);
> -	pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
> +	printk("t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
>  		regs->t1, regs->t2, regs->s0);
> -	pr_cont(" s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n",
> +	printk("s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n",
>  		regs->s1, regs->a0, regs->a1);
> -	pr_cont(" a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n",
> +	printk("a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n",
>  		regs->a2, regs->a3, regs->a4);
> -	pr_cont(" a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n",
> +	printk("a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n",
>  		regs->a5, regs->a6, regs->a7);
> -	pr_cont(" s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n",
> +	printk("s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n",
>  		regs->s2, regs->s3, regs->s4);
> -	pr_cont(" s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n",
> +	printk("s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n",
>  		regs->s5, regs->s6, regs->s7);
> -	pr_cont(" s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n",
> +	printk("s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n",
>  		regs->s8, regs->s9, regs->s10);
> -	pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n",
> +	printk("s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n",
>  		regs->s11, regs->t3, regs->t4);
> -	pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
> +	printk("t5 : " REG_FMT " t6 : " REG_FMT "\n",
>  		regs->t5, regs->t6);
>
> -	pr_cont("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n",
> +	printk("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n",
>  		regs->status, regs->badaddr, regs->cause);
>  }
>  void show_regs(struct pt_regs *regs)

For some reason I remember having these as printk()s originally, but I don't
see that in the git history so maybe it was from before we merged the port?  I
don't really understand the difference here, and I thought using printk()
directly wasn't recommended?

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  reply	other threads:[~2020-12-11  1:43 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-13  6:42 [PATCH 0/3] riscv: cover to ARCH_STACKWALK Kefeng Wang
2020-11-13  6:42 ` [PATCH 1/3] riscv: Cleanup stacktrace Kefeng Wang
2020-11-13  6:42 ` [PATCH 2/3] riscv: Make stack walk callback consistent with generic code Kefeng Wang
2020-11-13  6:42 ` [PATCH 3/3] riscv: Enable ARCH_STACKWALK Kefeng Wang
2020-11-21  3:01 ` [PATCH 0/3] riscv: cover to ARCH_STACKWALK Palmer Dabbelt
2020-11-24 11:20   ` [PATCH 1/2] riscv: Add dump stack in show_regs Kefeng Wang
2020-11-24 11:20     ` [PATCH 2/2] riscv: Fix __show_regs printing formats Kefeng Wang
2020-11-25 22:58       ` Atish Patra
2020-11-26  1:10         ` Kefeng Wang
2020-11-26 10:02           ` John Ogness
2020-11-26 11:55             ` John Ogness
2020-11-26 12:49               ` Kefeng Wang
2020-11-26 13:33       ` [PATCH v2] riscv: Using printk directly in __show_regs Kefeng Wang
2020-12-11  1:43         ` Palmer Dabbelt [this message]
2020-12-11  8:48           ` John Ogness
2020-12-14 11:49             ` Kefeng Wang
2020-11-25 23:04     ` [PATCH 1/2] riscv: Add dump stack in show_regs Atish Patra
2020-12-14 11:52     ` Kefeng Wang
2021-01-09 22:24       ` Palmer Dabbelt
2021-01-11  3:23         ` Kefeng Wang
2020-12-17  2:34   ` [PATCH 0/3] riscv: cover to ARCH_STACKWALK Kefeng Wang

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