Patch "driver core: Don't require dynamic_debug for initcall_debug probe timing" has been added to the 6.3-stable tree

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

    driver core: Don't require dynamic_debug for initcall_debug probe timing

to the 6.3-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:
     driver-core-don-t-require-dynamic_debug-for-initcall_debug-probe-timing.patch
and it can be found in the queue-6.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From e2f06aa885081e1391916367f53bad984714b4db Mon Sep 17 00:00:00 2001
From: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Date: Wed, 12 Apr 2023 15:58:42 -0700
Subject: driver core: Don't require dynamic_debug for initcall_debug probe timing

From: Stephen Boyd <swboyd@xxxxxxxxxxxx>

commit e2f06aa885081e1391916367f53bad984714b4db upstream.

Don't require the use of dynamic debug (or modification of the kernel to
add a #define DEBUG to the top of this file) to get the printk message
about driver probe timing. This printk is only emitted when
initcall_debug is enabled on the kernel commandline, and it isn't
immediately obvious that you have to do something else to debug boot
timing issues related to driver probe. Add a comment too so it doesn't
get converted back to pr_debug().

Fixes: eb7fbc9fb118 ("driver core: Add missing '\n' in log messages")
Cc: stable <stable@xxxxxxxxxx>
Cc: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Cc: Brian Norris <briannorris@xxxxxxxxxxxx>
Reviewed-by: Brian Norris <briannorris@xxxxxxxxxxxx>
Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230412225842.3196599-1-swboyd@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/base/dd.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -708,7 +708,12 @@ static int really_probe_debug(struct dev
 	calltime = ktime_get();
 	ret = really_probe(dev, drv);
 	rettime = ktime_get();
-	pr_debug("probe of %s returned %d after %lld usecs\n",
+	/*
+	 * Don't change this to pr_debug() because that requires
+	 * CONFIG_DYNAMIC_DEBUG and we want a simple 'initcall_debug' on the
+	 * kernel commandline to print this all the time at the debug level.
+	 */
+	printk(KERN_DEBUG "probe of %s returned %d after %lld usecs\n",
 		 dev_name(dev), ret, ktime_us_delta(rettime, calltime));
 	return ret;
 }


Patches currently in stable-queue which might be from swboyd@xxxxxxxxxxxx are

queue-6.3/driver-core-don-t-require-dynamic_debug-for-initcall_debug-probe-timing.patch



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