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

From: Justin He <Justin.He@arm.com>
To: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	Jonathan Corbet <corbet@lwn.net>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Eric Biggers <ebiggers@google.com>,
	"Ahmed S. Darwish" <a.darwish@linutronix.de>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: RE: [PATCH RFCv3 3/3] lib/test_printf: add test cases for '%pD'
Date: Tue, 15 Jun 2021 07:07:03 +0000	[thread overview]
Message-ID: <AM6PR08MB4376096643BA02A1AE2BA8F4F7309@AM6PR08MB4376.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <YMd5StgkBINLlb8E@alley>

Hi Petr

> -----Original Message-----
> From: Petr Mladek <pmladek@suse.com>
> Sent: Monday, June 14, 2021 11:44 PM
> To: Justin He <Justin.He@arm.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>; Sergey Senozhatsky
> <senozhatsky@chromium.org>; Andy Shevchenko
> <andriy.shevchenko@linux.intel.com>; Rasmus Villemoes
> <linux@rasmusvillemoes.dk>; Jonathan Corbet <corbet@lwn.net>; Alexander
> Viro <viro@zeniv.linux.org.uk>; Linus Torvalds <torvalds@linux-
> foundation.org>; Peter Zijlstra (Intel) <peterz@infradead.org>; Eric
> Biggers <ebiggers@google.com>; Ahmed S. Darwish <a.darwish@linutronix.de>;
> linux-doc@vger.kernel.org; linux-kernel@vger.kernel.org; linux-
> fsdevel@vger.kernel.org
> Subject: Re: [PATCH RFCv3 3/3] lib/test_printf: add test cases for '%pD'
>
> On Fri 2021-06-11 23:59:53, Jia He 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 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@arm.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 ec0d5976bb69..3632bd6cf906 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, BUF_SIZE +
> PAD_SIZE - (written + 1))) {
> > +   if (!is_prepend_buf && memchr_inv(test_buffer + written + 1,
> FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
> >             pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-
> terminator\n",
> >                     bufsize, fmt);
> >             return 1;
> > @@ -496,6 +498,27 @@ dentry(void)
> >     test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2],
> 12, &test_dentry[2]);
> >  }
> >
> > +static struct vfsmount test_vfsmnt = {};
> > +
> > +static struct file test_file __initdata = {
> > +   .f_path = { .dentry = &test_dentry[2],
> > +               .mnt = &test_vfsmnt,
> > +   },
> > +};
> > +
> > +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

--
Cheers,
Justin (Jia He)

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