linux-kernel - Re: [PATCH v4 03/18] kunit: test: add string_stream a std::stream like string builder

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Message-Id: <20190517174300.7949F20848@mail.kernel.org>
Date:   Fri, 17 May 2019 10:42:59 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Brendan Higgins <brendanhiggins@...gle.com>,
        frowand.list@...il.com, gregkh@...uxfoundation.org,
        jpoimboe@...hat.com, keescook@...gle.com,
        kieran.bingham@...asonboard.com, mcgrof@...nel.org,
        peterz@...radead.org, robh@...nel.org, shuah@...nel.org,
        tytso@....edu, yamada.masahiro@...ionext.com
Cc:     devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        kunit-dev@...glegroups.com, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-um@...ts.infradead.org,
        Alexander.Levin@...rosoft.com, Tim.Bird@...y.com,
        amir73il@...il.com, dan.carpenter@...cle.com, daniel@...ll.ch,
        jdike@...toit.com, joel@....id.au, julia.lawall@...6.fr,
        khilman@...libre.com, knut.omang@...cle.com, logang@...tatee.com,
        mpe@...erman.id.au, pmladek@...e.com, rdunlap@...radead.org,
        richard@....at, rientjes@...gle.com, rostedt@...dmis.org,
        wfg@...ux.intel.com, Brendan Higgins <brendanhiggins@...gle.com>
Subject: Re: [PATCH v4 03/18] kunit: test: add string_stream a std::stream like string builder

Quoting Brendan Higgins (2019-05-14 15:16:56)
> A number of test features need to do pretty complicated string printing
> where it may not be possible to rely on a single preallocated string
> with parameters.
> 
> So provide a library for constructing the string as you go similar to
> C++'s std::string.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@...tatee.com>

Is there any reason why we can't use the seqfile API for this? These
both share a similar goal, formatting strings into a buffer to be read
later. Maybe some new APIs would be needed to extract the buffer
differently, but I hope we could share the code.

If it can't be used, can you please add the reasoning to the commit text
here?