linux-kernel - Re: [PATCH] arm64: Neaten show_regs, remove KERN

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Date:   Mon, 24 Oct 2016 09:27:57 -0700
From:   Joe Perches <joe@...ches.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: Neaten show_regs, remove KERN_CONT

On Mon, 2016-10-24 at 12:31 +0100, Mark Rutland wrote:
> On Sun, Oct 23, 2016 at 01:40:49PM -0700, Joe Perches wrote:
> > commit db4b0710fae9 ("arm64: fix show_regs fallout from KERN_CONT changes")
> > corrected the KERN_CONT fallout from commit 4bcc595ccd80
> > ("printk: reinstate KERN_CONT for printing continuation lines"), but
> > the code still has unnecessary KERN_CONT uses.  Remove them.
> 
> Why are these unnecessary KERN_CONTs a larger problem than duplicating
> the format string for a third time? Having to duplicate it at all was
> annoying enough.

Not printing partial lines is the best solution to avoiding
message output interleaving.

> Overall, to avoid messing with the KERN_CONT mess it'd be nicer to
> format this all into a buffer (with the format string only existing the
> once) and subsequently print it with one printk call

A single printk call would get one timestamp which would
make for ragged/staggered reading.