linux-kernel - Re: [PATCH] perf: remove orphan DEBUG_PERF_USE

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Date:   Wed, 28 Sep 2016 08:56:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     Kim Phillips <kim.phillips@....com>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Petr Mladek <pmladek@...e.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-snps-arc@...ts.infradead.org,
        Thomas Garnier <thgarnie@...gle.com>
Subject: Re: [PATCH] perf: remove orphan DEBUG_PERF_USE_VMALLOC

On Tue, Sep 27, 2016 at 09:51:35AM -0700, Vineet Gupta wrote:
> On 09/27/2016 09:37 AM, Kim Phillips wrote:
> > On Tue, 27 Sep 2016 07:53:56 -0700
> > Vineet Gupta <Vineet.Gupta1@...opsys.com> wrote:
> > 
> >> > This doesn't seem to be used anywhere
> > I thought so too, until I got this response for an equivalent patch:
> > 
> > https://lkml.org/lkml/2016/8/31/53
> 
> So this is some sort of "developer shortcut" to quickly enable 2 options with one
> option. Purpose seems dubious to me ! It would still be possible to enable vmalloc
> backed mmap on x86 by simply enabling that option from Kconfig.

PERF_USE_VMALLOC is not a user selectable option. Also
DEBUG_PERF_USE_VMALLOC clearly indicates its a _DEBUG_ option. Heck,
even the help text says what its for.