From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Matlack Subject: [PATCH 1/2] jump_labels: API for flushing deferred jump label updates Date: Fri, 16 Dec 2016 14:30:35 -0800 Message-ID: <1481927436-104568-1-git-send-email-dmatlack@google.com> Cc: pbonzini@redhat.com, rkrcmar@redhat.com, peterz@infradead.org, haokexin@gmail.com, mpe@ellerman.id.au, yongjun_wei@trendmicro.com.cn, rusty@rustcorp.com.au, jbaron@akamai.com, David Matlack To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Received: from mail-pg0-f54.google.com ([74.125.83.54]:36811 "EHLO mail-pg0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753596AbcLPWbA (ORCPT ); Fri, 16 Dec 2016 17:31:00 -0500 Received: by mail-pg0-f54.google.com with SMTP id f188so36456300pgc.3 for ; Fri, 16 Dec 2016 14:30:59 -0800 (PST) Sender: kvm-owner@vger.kernel.org List-ID: 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 --- include/linux/jump_label_ratelimit.h | 5 +++++ kernel/jump_label.c | 7 +++++++ 2 files changed, 12 insertions(+) diff --git a/include/linux/jump_label_ratelimit.h b/include/linux/jump_label_ratelimit.h index 089f70f..23da3af 100644 --- 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_deferred(struct static_key_deferred *key) 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) diff --git a/kernel/jump_label.c b/kernel/jump_label.c index 93ad6c1..a9b8cf5 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -182,6 +182,13 @@ void static_key_slow_dec_deferred(struct static_key_deferred *key) } 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) { -- 2.8.0.rc3.226.g39d4020