Patch "lib/vsprintf: Remove atomic-unsafe support for %pCr" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

lib/vsprintf: Remove atomic-unsafe support for %pCr

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
lib-vsprintf-remove-atomic-unsafe-support-for-pcr.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Geert Uytterhoeven <[email protected]>
Date: Fri, 1 Jun 2018 11:28:22 +0200
Subject: lib/vsprintf: Remove atomic-unsafe support for %pCr

From: Geert Uytterhoeven <[email protected]>

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.

To: Jia-Ju Bai <[email protected]>
To: Jonathan Corbet <[email protected]>
To: Michael Turquette <[email protected]>
To: Stephen Boyd <[email protected]>
To: Zhang Rui <[email protected]>
To: Eduardo Valentin <[email protected]>
To: Eric Anholt <[email protected]>
To: Stefan Wahren <[email protected]>
To: Greg Kroah-Hartman <[email protected]>

---
 Documentation/printk-formats.txt |    3 +--
 lib/vsprintf.c                   |    3 ---
 2 files changed, 1 insertion(+), 5 deletions(-)

@@ -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.
 

@@ -1391,9 +1391,6 @@ char *clock(char *buf, char *end, struct
 		return string(buf, end, NULL, spec);
 
 	switch (fmt[1]) {
-	case 'r':
-		return number(buf, end, clk_get_rate(clk), spec);
-
 	case 'n':
 	default:
 #ifdef CONFIG_COMMON_CLK

Patches currently in stable-queue which might be from geert+renesas at glider.be are

queue-4.9/lib-vsprintf-remove-atomic-unsafe-support-for-pcr.patch queue-4.9/serial-sh-sci-use-spin_-try-lock_irqsave-instead-of-open-coding-version.patch queue-4.9/clk-renesas-cpg-mssr-stop-using-printk-format-pcr.patch