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

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Date:   Tue, 25 Oct 2016 19:04:08 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Joe Perches <joe@...ches.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: Neaten show_regs, remove KERN_CONT

On Tue, Oct 25, 2016 at 10:38:31AM -0700, Linus Torvalds wrote:
> On Mon, Oct 24, 2016 at 9:42 AM, Mark Rutland <mark.rutland@....com> wrote:
> >
> > That does not appear to be the case; as fr as I can tell the core prints a
> > timestamp per line as required. If I run:
> >
> >         printk("TEST\nLINE1\nLINE2\nLINE3\nLINE4\n");
> 
> Please don't do this.
>
> It has historically not worked well, and it still doesn't actually
> work reliably. In particular, it currently works in the *logs* (ie
> dmesg), but not necessarily on screen (because "msg_print_text()" does
> do the "look for newlines in the middle", but console_cont_flush()
> does not).

Sure; I'll avoid that.

it seems that's a drop in the ocean, though. :/

[mark@...erpostej:~/src/linux]% git grep 'pr\(intk\|_.*\)(.*)' | grep '\\n[^"]' | wc -l 
375

> So you can try the attached patch. It likely fixes your issues simply
> because it removes all the crazy code.

That worked for me. I see consistent results over the UART and in dmesg
with that applied atop of v4.9-rc2. Feel free to add:

Tested-by: Mark Rutland <mark.rutland@....com>

Thanks,
Mark.