This is a note to let you know that I've just added the patch titled
jump_labels: API for flushing deferred jump label updates
to the 4.4-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_labels-api-for-flushing-deferred-jump-label-updates.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b6416e61012429e0277bd15a229222fd17afc1c1 Mon Sep 17 00:00:00 2001
From: David Matlack <dmatlack@xxxxxxxxxx>
Date: Fri, 16 Dec 2016 14:30:35 -0800
Subject: jump_labels: API for flushing deferred jump label updates
From: David Matlack <dmatlack@xxxxxxxxxx>
commit b6416e61012429e0277bd15a229222fd17afc1c1 upstream.
Modules that use static_key_deferred need a way to synchronize with
any delayed work that is still pending when the module is unloaded.
Introduce static_key_deferred_flush() which flushes any pending
jump label updates.
Signed-off-by: David Matlack <dmatlack@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/jump_label_ratelimit.h | 5 +++++
kernel/jump_label.c | 7 +++++++
2 files changed, 12 insertions(+)
--- a/include/linux/jump_label_ratelimit.h
+++ b/include/linux/jump_label_ratelimit.h
@@ -14,6 +14,7 @@ struct static_key_deferred {
#ifdef HAVE_JUMP_LABEL
extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
+extern void static_key_deferred_flush(struct static_key_deferred *key);
extern void
jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
@@ -26,6 +27,10 @@ static inline void static_key_slow_dec_d
STATIC_KEY_CHECK_USE();
static_key_slow_dec(&key->key);
}
+static inline void static_key_deferred_flush(struct static_key_deferred *key)
+{
+ STATIC_KEY_CHECK_USE();
+}
static inline void
jump_label_rate_limit(struct static_key_deferred *key,
unsigned long rl)
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -138,6 +138,13 @@ void static_key_slow_dec_deferred(struct
}
EXPORT_SYMBOL_GPL(static_key_slow_dec_deferred);
+void static_key_deferred_flush(struct static_key_deferred *key)
+{
+ STATIC_KEY_CHECK_USE();
+ flush_delayed_work(&key->work);
+}
+EXPORT_SYMBOL_GPL(static_key_deferred_flush);
+
void jump_label_rate_limit(struct static_key_deferred *key,
unsigned long rl)
{
Patches currently in stable-queue which might be from dmatlack@xxxxxxxxxx are
queue-4.4/kvm-x86-flush-pending-lapic-jump-label-updates-on-module-unload.patch
queue-4.4/jump_labels-api-for-flushing-deferred-jump-label-updates.patch
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