RE: [PATCH v5 2/4] lib/vsprintf.c: make '%pD' print the full path of file

[Justin He <Justin.He@arm.com>]

Hi Andy

> -----Original Message-----
> From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Sent: Tuesday, June 22, 2021 10:40 PM
> To: Justin He <Justin.He@arm.com>
> Cc: Petr Mladek <pmladek@suse.com>; Steven Rostedt <rostedt@goodmis.org>;
> Sergey Senozhatsky <senozhatsky@chromium.org>; 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; Matthew Wilcox <willy@infradead.org>; Christoph
> Hellwig <hch@infradead.org>; nd <nd@arm.com>
> Subject: Re: [PATCH v5 2/4] lib/vsprintf.c: make '%pD' print the full path
> of file
> 
> On Tue, Jun 22, 2021 at 10:06:32PM +0800, Jia He wrote:
> > Previously, the specifier '%pD' is for printing dentry name of struct
> > file. It may not be perfect (by default it only prints one component.)
> >
> > As suggested by Linus [1]:
> 
> Citing is better looked when you shift right it by two white spaces.

Okay, I plan to cite it with "> "
> 
> > A dentry has a parent, but at the same time, a dentry really does
> > inherently have "one name" (and given just the dentry pointers, you
> > can't show mount-related parenthood, so in many ways the "show just
> > one name" makes sense for "%pd" in ways it doesn't necessarily for
> > "%pD"). But while a dentry arguably has that "one primary component",
> > a _file_ is certainly not exclusively about that last component.
> >
> > Hence change the behavior of '%pD' to print the full path of that file.
> >
> > Precision is never going to be used with %p (or any of its kernel
> > extensions) if -Wformat is turned on.
> 
> > Link: https://lore.kernel.org/lkml/CAHk-=wimsMqGdzik187YWLb-
> ru+iktb4MYbMQG1rnZ81dXYFVg@mail.gmail.com/ [1]
> 
> 
> >
> 
> Shouldn't be blank lines in the tag block. I have an impression that I have
> commented on this already...

Okay
> 
> ...
> 
> > -last components.  %pD does the same thing for struct file.
> > +last components.  %pD prints full file path together with mount-related
> 
> I guess you may also convert double space to a single one.
> 

Okay

--
Cheers,
Justin (Jia He)