linux-kernel - Re: [RFC PATCH 28/30] Improved symbolic error names

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Message-ID: <20220901232645.4dogffr26oisd7p5@moria.home.lan>
Date:   Thu, 1 Sep 2022 19:26:45 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Joe Perches <joe@...ches.com>
Cc:     Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org,
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Subject: Re: [RFC PATCH 28/30] Improved symbolic error names

On Thu, Sep 01, 2022 at 04:19:35PM -0700, Joe Perches wrote:
> On Tue, 2022-08-30 at 14:49 -0700, Suren Baghdasaryan wrote:
> > From: Kent Overstreet <kent.overstreet@...ux.dev>
> > 
> > This patch adds per-error-site error codes, with error strings that
> > include their file and line number.
> > 
> > To use, change code that returns an error, e.g.
> >     return -ENOMEM;
> > to
> >     return -ERR(ENOMEM);
> > 
> > Then, errname() will return a string that includes the file and line
> > number of the ERR() call, for example
> >     printk("Got error %s!\n", errname(err));
> > will result in
> >     Got error ENOMEM at foo.c:1234
> 
> Why? Something wrong with just using %pe ?
> 
> 	printk("Got error %pe at %s:%d!\n", ERR_PTR(err), __FILE__, __LINE__);
> 
> Likely __FILE__ and __LINE__ aren't particularly useful.

That doesn't do what this patchset does. If it only did that, it wouldn't make
much sense, would it? :)

With this patchset,
     printk("Got error %pe!\n", ptr);

prints out a file and line number, but it's _not_ the file/line number of the
printk statement - it's the file/line number where the error originated!

:)