linux-kernel - Re: [PATCH v2 1/8] lib/printbuf: New data structure for heap-allocated strings

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Message-ID: <9ab6601364a16c782ca36ab22a2c67face0785a7.camel@perches.com>
Date:   Sun, 24 Apr 2022 21:48:58 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kent Overstreet <kent.overstreet@...il.com>,
        Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, hch@....de, hannes@...xchg.org,
        akpm@...ux-foundation.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-input@...r.kernel.org,
        roman.gushchin@...ux.dev
Subject: Re: [PATCH v2 1/8] lib/printbuf: New data structure for
 heap-allocated strings

On Mon, 2022-04-25 at 00:19 -0400, Kent Overstreet wrote:
> On Mon, Apr 25, 2022 at 03:44:34AM +0100, Matthew Wilcox wrote:
> > On Sun, Apr 24, 2022 at 04:46:03PM -0700, Joe Perches wrote:
> > > > + * pr_human_readable_u64, pr_human_readable_s64: Print an integer with human
> > > > + * readable units.
> > > 
> > > Why not extend vsprintf for this using something like %pH[8|16|32|64] 
> > > or %pH[c|s|l|ll|uc|us|ul|ull] ?
> > 
> > The %pX extension we have is _cute_, but ultimately a bad idea.  It
> > centralises all kinds of unrelated things in vsprintf.c, eg bdev_name()
> > and clock() and ip_addr_string().
> 
> And it's not remotely discoverable. I didn't realize we had bdev_name()
> available as a format string until just now or I would've been using it!

Documentation/core-api/printk-formats.rst