linux-kernel - Re: [RFC PATCH 1/3] config: provide a fragment to enable gdb for qemu

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Message-ID: <20181218132920.GC6537@sirena.org.uk>
Date:   Tue, 18 Dec 2018 13:29:20 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Anders Roxell <anders.roxell@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 1/3] config: provide a fragment to enable gdb for qemu

On Tue, Dec 18, 2018 at 10:07:21AM +0100, Arnd Bergmann wrote:
> On Tue, Dec 18, 2018 at 9:45 AM Anders Roxell <anders.roxell@...aro.org> wrote:
> > On Thu, 13 Dec 2018 at 13:40, Mark Brown <broonie@...nel.org> wrote:

> > > Is this specifically for qemu or is this just good for debugging with
> > > GDB in general (eg, via JTAG)?

> > I haven't tried, and I don't have a JTAG so I could test it =/

> The DEBUG_INFO=y and (as a dependency for that) CONFIG_COMPILE_TEST
> are definitely needed for all GDB operation. I would assume that
> the scripts also work with any other gdb environment, but haven't tried either.

I'm fairly sure the requirements are identical, though it has been quite
some time since I tried and I don't have relevant hardware any more so
can't confirm.

> For CONFIG_RANDOMIZE_BASE, I'm not actually sure if that helps or
> not. I think I originally suggested to Anders to turn that off when he
> was analyzing a bug, but I don't know if it helped or if it works just
> as well without that.

Yeah, I'd think it'd be helpful to turn that off.

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