linux-kernel - Re: [PATCHv7 2/8] printk: rename nmi.c and exported api

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Message-ID: <CAMuHMdVT2CHYjrs_V8CN7RiEOHCyDvBH5ko64Y50AvyrRE6Erg@mail.gmail.com>
Date:   Thu, 23 Feb 2017 10:23:28 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, Tejun Heo <tj@...nel.org>,
        Calvin Owens <calvinowens@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Hurley <peter@...leysoftware.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv7 2/8] printk: rename nmi.c and exported api

Hi Sergey,

On Thu, Feb 23, 2017 at 9:02 AM, Sergey Senozhatsky
<sergey.senozhatsky.work@...il.com> wrote:
> On (02/23/17 08:50), Geert Uytterhoeven wrote:
>> > -config NMI_LOG_BUF_SHIFT
>> > -       int "Temporary per-CPU NMI log buffer size (12 => 4KB, 13 => 8KB)"
>> > +config PRINTK_SAFE_LOG_BUF_SHIFT
>> > +       int "Temporary per-CPU printk log buffer size (12 => 4KB, 13 => 8KB)"
>> >         range 10 21
>> >         default 13
>> > -       depends on PRINTK_NMI
>> > +       depends on PRINTK
>>
>> Was this dependency change intentional?
>> My platform doesn't have PRINTK_NMI.
>
> yes. printk-safe uses the same mechanism as printk-nmi (per-CPU buffers, etc.)
> and does not depend on HAVE_NMI/PRINTK_NMI, but depends on PRINTK.
>
> NMI related part of printk-safe (printk-nmi per-CPU buffers, etc.) is not
> compiled for !HAVE_NMI systems (since PRINTK_NMI is unset there).

OK, thanks for the clarification!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds