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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2018-06-01 12:28:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-03 12:23:06 +0300 |
| commit | ec7bea37c833616b63a740d1ba54d2a030b62b32 (patch) | |
| tree | d5463a3b84e2d8bc8d4609adf66209b4f989ceb9 /Documentation | |
| parent | 676b002f26f98214856dfebd3bba2673ed9037c9 (diff) | |
| download | linux-ec7bea37c833616b63a740d1ba54d2a030b62b32.tar.xz | |
lib/vsprintf: Remove atomic-unsafe support for %pCr
commit 666902e42fd8344b923c02dc5b0f37948ff4f225 upstream.
"%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.
Remove support for this rarely-used format, as vsprintf() (and e.g.
printk()) must be callable from any context.
Any remaining out-of-tree users will start seeing the clock's name
printed instead of its rate.
Reported-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Fixes: 900cca2944254edd ("lib/vsprintf: add %pC{,n,r} format specifiers for clocks")
Link: http://lkml.kernel.org/r/1527845302-12159-5-git-send-email-geert+renesas@glider.be
To: Jia-Ju Bai <baijiaju1990@gmail.com>
To: Jonathan Corbet <corbet@lwn.net>
To: Michael Turquette <mturquette@baylibre.com>
To: Stephen Boyd <sboyd@kernel.org>
To: Zhang Rui <rui.zhang@intel.com>
To: Eduardo Valentin <edubezval@gmail.com>
To: Eric Anholt <eric@anholt.net>
To: Stefan Wahren <stefan.wahren@i2se.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-clk@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Cc: linux-serial@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-renesas-soc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: stable@vger.kernel.org # 4.1+
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/printk-formats.txt | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt index 5962949944fd..d2fbeeb29582 100644 --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -279,11 +279,10 @@ struct clk: %pC pll1 %pCn pll1 - %pCr 1560000000 For printing struct clk structures. '%pC' and '%pCn' print the name (Common Clock Framework) or address (legacy clock framework) of the - structure; '%pCr' prints the current clock rate. + structure. Passed by reference. |