linux-kernel - Re: [RFC v3 08/19] arch: um: add shim to trap to allow installing a fault catcher for tests

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Message-ID: <20181130034135.GN18410@garbanzo.do-not-panic.com>
Date:   Thu, 29 Nov 2018 19:41:35 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Brendan Higgins <brendanhiggins@...gle.com>
Cc:     gregkh@...uxfoundation.org, keescook@...gle.com, shuah@...nel.org,
        joel@....id.au, mpe@...erman.id.au, joe@...ches.com, brakmo@...com,
        rostedt@...dmis.org, Tim.Bird@...y.com, khilman@...libre.com,
        julia.lawall@...6.fr, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        jdike@...toit.com, richard@....at, linux-um@...ts.infradead.org,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org, robh@...nel.org,
        dan.j.williams@...el.com, linux-nvdimm@...ts.01.org,
        kieran.bingham@...asonboard.com, frowand.list@...il.com,
        knut.omang@...cle.com
Subject: Re: [RFC v3 08/19] arch: um: add shim to trap to allow installing a
 fault catcher for tests

On Wed, Nov 28, 2018 at 11:36:25AM -0800, Brendan Higgins wrote:
> +static void segv_run_catcher(jmp_buf *catcher, void *fault_addr)
> +{
> +	current->thread.fault_addr = fault_addr;
> +	UML_LONGJMP(catcher, 1);
> +}

Some documentation about what this does exactly would be appreciated.
With the goal it may be useful to others wanting to consider support
for other archs -- if that actually ends up being desirable.

  Luis