linux-kernel - RE: [PATCH RFCv4 4/4] lib/test_printf.c: add test cases for '%pD'

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Date:   Tue, 22 Jun 2021 02:21:36 +0000
From:   Justin He <Justin.He@....com>
To:     Petr Mladek <pmladek@...e.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Eric Biggers <ebiggers@...gle.com>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        Linux Documentation List <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: RE: [PATCH RFCv4 4/4] lib/test_printf.c: add test cases for '%pD'



> -----Original Message-----
> From: Petr Mladek <pmladek@...e.com>
> Sent: Thursday, June 17, 2021 10:53 PM
> To: Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: Justin He <Justin.He@....com>; Steven Rostedt <rostedt@...dmis.org>;
> Sergey Senozhatsky <senozhatsky@...omium.org>; Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com>; Rasmus Villemoes
> <linux@...musvillemoes.dk>; Jonathan Corbet <corbet@....net>; Alexander
> Viro <viro@...iv.linux.org.uk>; Linus Torvalds <torvalds@...ux-
> foundation.org>; Peter Zijlstra (Intel) <peterz@...radead.org>; Eric
> Biggers <ebiggers@...gle.com>; Ahmed S. Darwish <a.darwish@...utronix.de>;
> Linux Documentation List <linux-doc@...r.kernel.org>; Linux Kernel Mailing
> List <linux-kernel@...r.kernel.org>; Linux FS Devel <linux-
> fsdevel@...r.kernel.org>; Matthew Wilcox <willy@...radead.org>
> Subject: Re: [PATCH RFCv4 4/4] lib/test_printf.c: add test cases for '%pD'
>
> On Tue 2021-06-15 23:47:29, Andy Shevchenko wrote:
> > On Tue, Jun 15, 2021 at 6:55 PM Jia He <justin.he@....com> wrote:
> > >
> > > After the behaviour of specifier '%pD' is changed to print full path
> > > of struct file, the related test cases are also updated.
> > >
> > > Given the string of '%pD' is prepended from the end of the buffer, the
> > > check of "wrote beyond the nul-terminator" should be skipped.
> > >
> > > Signed-off-by: Jia He <justin.he@....com>
> > > ---
> > >  lib/test_printf.c | 26 +++++++++++++++++++++++++-
> > >  1 file changed, 25 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/lib/test_printf.c b/lib/test_printf.c
> > > index d1d2f898ebae..9f851a82b3af 100644
> > > --- a/lib/test_printf.c
> > > +++ b/lib/test_printf.c
> > > @@ -78,7 +80,7 @@ do_test(int bufsize, const char *expect, int elen,
> > >                 return 1;
> > >         }
> > >
> > > -       if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize -
> (written + 1))) {
> >
> > > +       if (!is_prepended_buf && memchr_inv(test_buffer + written + 1,
> FILL_CHAR, bufsize - (written + 1))) {
> >
> > Can it be parametrized? I don't like the custom test case being
> > involved here like this.
>
> Yup, it would be nice.
>
> Also it is far from obvious what @is_prepended_buf means if you do not
> have context of this patchset. I think about a more generic name
> that comes from the wording used in 3rd patch, e.g.
>
>     @need_scratch_space or @using_scratch_space or @dirty_buf
>
> Anyway, the most easy way to pass this as a parameter would be to add it
> to __test() and define a wrapper, .e.g:
>
> static void __printf(3, 4) __init
> __test(const char *expect, int elen, bool using_scratch_space,
>       const char *fmt, ...)
>
> /*
>  * More relaxed test for non-standard formats that are using the provided
> buffer
>  * as a scratch space and write beyond the trailing '\0'.
>  */
> #define test_using_scratch_space(expect, fmt, ...)                    \
>       __test(expect, strlen(expect), true, fmt, ##__VA_ARGS__)
Okay, thanks for the suggestion.


--
Cheers,
Justin (Jia He)


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