linux-kernel - Re: [PATCH v2 5/9] arm64: Add call_break_hook() to early

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Message-ID: <20200427165255.bjwkjobfzinzzlxb@holly.lan>
Date:   Mon, 27 Apr 2020 17:52:55 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     jason.wessel@...driver.com, gregkh@...uxfoundation.org,
        kgdb-bugreport@...ts.sourceforge.net, mingo@...hat.com,
        hpa@...or.com, bp@...en8.de, linux-serial@...r.kernel.org,
        agross@...nel.org, tglx@...utronix.de, frowand.list@...il.com,
        bjorn.andersson@...aro.org, jslaby@...e.com,
        catalin.marinas@....com, corbet@....net, will@...nel.org,
        Alexios Zavras <alexios.zavras@...el.com>,
        Allison Randal <allison@...utok.net>,
        Dave Martin <Dave.Martin@....com>,
        Enrico Weigelt <info@...ux.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        James Morse <james.morse@....com>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        jinho lim <jordan.lim@...sung.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/9] arm64: Add call_break_hook() to early_brk64() for
 early kgdb

On Tue, Apr 21, 2020 at 02:14:43PM -0700, Douglas Anderson wrote:
> In order to make early kgdb work properly we need early_brk64() to be
> able to call into it.  This is as easy as adding a call into
> call_break_hook() just like we do later in the normal brk_handler().
> 
> Once we do this we can let kgdb know that it can break into the
> debugger a little earlier (specifically when parsing early_param's).
> 
> NOTE: without this patch it turns out that arm64 can't do breakpoints
> even at dbg_late_init(), so if we decide something about this patch is
> wrong we might need to move dbg_late_init() a little later.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>

I haven't done any testing at this point (I'd hope to enable tests
for this in the test suite), however FWIW and just so you know I didn't
forget about this patch:

Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>


Daniel.