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

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Date:   Tue, 25 Oct 2016 10:38:31 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Mark Rutland <mark.rutland@....com>
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 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).

It so happens that the patch I've been sending people probably fixes
that odd case too, almost entirely by mistake (if "by mistake" you
mean "it gets rid of the insane special cases that cause problems like
this").

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

              Linus

View attachment "patch.diff" of type "text/plain" (19844 bytes)