From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Jia-Ju Bai <baijiaju1990@gmail.com>,
Jonathan Corbet <corbet@lwn.net>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>, Zhang Rui <rui.zhang@intel.com>,
Eduardo Valentin <edubezval@gmail.com>,
Eric Anholt <eric@anholt.net>,
Stefan Wahren <stefan.wahren@i2se.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Petr Mladek <pmladek@suse.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
linux-doc@vger.kernel.org, linux-clk@vger.kernel.org,
linux-pm@vger.kernel.org, linux-serial@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH 0/4] lib/vsprintf: Remove atomic-unsafe support for printk format %pCr
Date: Fri, 1 Jun 2018 11:28:18 +0200 [thread overview]
Message-ID: <1527845302-12159-1-git-send-email-geert+renesas@glider.be> (raw)
Hi all,
"%pCr" formats the current rate of a clock, and calls clk_get_rate().
The latter obtains a mutex, hence it must not be called from atomic
context. As vsprintf() (and e.g. printk()) must be callable from any
context, it's better to remove support for this (rarely-used) format.
This patch series:
- Changes all existing users of "%pCr" to print the result of
clk_get_rate() directly, which is safe as they all do this in task
context only,
- Removes support for the "%pCr" printk format.
Note that any remaining out-of-tree users will start seeing the clock's
name printed instead of its rate.
Thanks for your comments!
Geert Uytterhoeven (4):
clk: renesas: cpg-mssr: Stop using printk format %pCr
thermal: bcm2835: Stop using printk format %pCr
serial: sh-sci: Stop using printk format %pCr
lib/vsprintf: Remove atomic-unsafe support for %pCr
Documentation/core-api/printk-formats.rst | 3 +--
drivers/clk/renesas/renesas-cpg-mssr.c | 9 +++++----
drivers/thermal/broadcom/bcm2835_thermal.c | 4 ++--
drivers/tty/serial/sh-sci.c | 4 ++--
lib/vsprintf.c | 3 ---
5 files changed, 10 insertions(+), 13 deletions(-)
--
2.7.4
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next reply other threads:[~2018-06-01 9:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-01 9:28 Geert Uytterhoeven [this message]
2018-06-01 9:28 ` [PATCH 1/4] clk: renesas: cpg-mssr: Stop using printk format %pCr Geert Uytterhoeven
2018-06-01 16:37 ` Stephen Boyd
2018-06-01 9:28 ` [PATCH 2/4] thermal: bcm2835: " Geert Uytterhoeven
2018-06-01 9:35 ` Stefan Wahren
2018-06-01 9:28 ` [PATCH 3/4] serial: sh-sci: " Geert Uytterhoeven
2018-06-01 9:28 ` [PATCH 4/4] lib/vsprintf: Remove atomic-unsafe support for %pCr Geert Uytterhoeven
2018-06-01 11:00 ` [PATCH 0/4] lib/vsprintf: Remove atomic-unsafe support for printk format %pCr Linus Torvalds
2018-06-01 11:04 ` Andy Shevchenko
2018-06-01 11:47 ` Petr Mladek
2018-06-01 15:19 ` Petr Mladek
2018-06-01 15:28 ` Geert Uytterhoeven
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