linux-kernel - RE: [PATCH RFCv3 3/3] lib/test_printf: add test cases for '%pD'

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Date:   Tue, 15 Jun 2021 07:56:01 +0000
From:   Justin He <Justin.He@....com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Petr Mladek <pmladek@...e.com>
CC:     Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        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-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: RE: [PATCH RFCv3 3/3] lib/test_printf: add test cases for '%pD'



> -----Original Message-----
> From: Rasmus Villemoes <linux@...musvillemoes.dk>
> Sent: Tuesday, June 15, 2021 3:48 PM
> To: Justin He <Justin.He@....com>; Petr Mladek <pmladek@...e.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>; Sergey Senozhatsky
> <senozhatsky@...omium.org>; Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com>; 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-doc@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> fsdevel@...r.kernel.org
> Subject: Re: [PATCH RFCv3 3/3] lib/test_printf: add test cases for '%pD'
>
> On 15/06/2021 09.07, Justin He wrote:
> > Hi Petr
> >
>
> >>> +static void __init
> >>> +f_d_path(void)
> >>> +{
> >>> +   test("(null)", "%pD", NULL);
> >>> +   test("(efault)", "%pD", PTR_INVALID);
> >>> +
> >>> +   is_prepend_buf = true;
> >>> +   test("/bravo/alfa   |/bravo/alfa   ", "%-14pD|%*pD", &test_file, -
> 14,
> >> &test_file);
> >>> +   test("   /bravo/alfa|   /bravo/alfa", "%14pD|%*pD", &test_file, 14,
> >> &test_file);
> >>> +   test("   /bravo/alfa|/bravo/alfa   ", "%14pD|%-14pD", &test_file,
> >> &test_file);
> >>
> >> Please, add more test for scenarios when the path does not fit into
> >> the buffer or when there are no limitations, ...
> >
> > Indeed, thanks
>
> Doesn't the existing test() helper do this for you automatically?
>
>         /*
>          * Every fmt+args is subjected to four tests: Three where we
>          * tell vsnprintf varying buffer sizes (plenty, not quite
>          * enough and 0), and then we also test that kvasprintf would
>          * be able to print it as expected.
>          */
>

Yes, it had invoked vsnprintf for 3 times in __test()
vsnprintf(buf,256)
vsnprintf(buf,random_bytes,...)
vsnprintf(buf, 0,...);
seems no need to add more test cases

> I don't see why one would need to do anything special for %pD.

Okay, got it, agree


--
Cheers,
Justin (Jia He)


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