Patch "jump_label: Invoke jump_label_test() via early_initcall()" has been added to the 4.14-stable tree

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

jump_label: Invoke jump_label_test() via early_initcall()

to the 4.14-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:
jump_label-invoke-jump_label_test-via-early_initcall.patch
and it can be found in the queue-4.14 subdirectory.

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

From: Jason Baron <[email protected]>
Date: Mon, 13 Nov 2017 16:48:47 -0500
Subject: jump_label: Invoke jump_label_test() via early_initcall()

From: Jason Baron <[email protected]>

[ Upstream commit 92ee46efeb505ead3ab06d3c5ce695637ed5f152 ]

Fengguang Wu reported that running the rcuperf test during boot can cause the jump_label_test() to hit a WARN_ON(). The issue is that the core jump label code relies on kernel_text_address() to detect when it can no longer update branches that may be contained in __init sections. The kernel_text_address() in turn assumes that if the system_state variable is greter than or equal to SYSTEM_RUNNING then __init sections are no longer valid (since the assumption is that they have been freed). However, when rcuperf is setup to run in early boot it can call kernel_power_off() which sets the system_state to SYSTEM_POWER_OFF.

Since rcuperf initialization is invoked via a module_init(), we can make the dependency of jump_label_test() needing to complete before rcuperf explicit by calling it via early_initcall().

---
 kernel/jump_label.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -769,7 +769,7 @@ static __init int jump_label_test(void)
 
 	return 0;
 }
-late_initcall(jump_label_test);
+early_initcall(jump_label_test);
 #endif /* STATIC_KEYS_SELFTEST */
 
 #endif /* HAVE_JUMP_LABEL */

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/jump_label-invoke-jump_label_test-via-early_initcall.patch queue-4.14/dynamic-debug-howto-fix-optional-omitted-ending-line-number-to-be-large-instead-of-0.patch