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 5.15-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-5.15 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
@@ -690,7 +690,12 @@ 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-5.15/driver-core-don-t-require-dynamic_debug-for-initcall_debug-probe-timing.patch
