From patchwork Tue Nov 22 17:45:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 627595 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1801AC433FE for ; Tue, 22 Nov 2022 17:46:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234566AbiKVRqF (ORCPT ); Tue, 22 Nov 2022 12:46:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233878AbiKVRpl (ORCPT ); Tue, 22 Nov 2022 12:45:41 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA4A27CB84; Tue, 22 Nov 2022 09:45:03 -0800 (PST) Message-ID: <20221122173648.737720888@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1669139102; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=y8/Vu8FUleXD3Q2rM81FfgxNTEn3ZV50/HwHiGfKzVY=; b=FseicS90xmf4gF1/tgcarYUG2IWEALo5wjRDB5bPlMl5usMOp61n8lHSQXUIyyfy+AVZWt iM/QqKgTQH8STr2H2lrM9Xq1hciVp6V5y8RujYnhgjUAsZdI3wCpwrpVzG88Oc9b1skgsr odLIAshZxWvWhd8Jx5W1nb7nWzQh6x2BBkIp5R0L6DbPU8bNLhu0KgFqQBv1DOo45wOKAw ZXnzBWLDK/DC85WTrCTi5cUnDvM3UFLDHRDYdXhfkArYoxZxp8w1+2JhIeTmpfWgRAsm29 z3xJzrfkUdt1RG7KN0QX7t5oh/oofsc3JWYZr+e5OPmrlxLj/mo7o8b6hyf6TA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1669139102; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=y8/Vu8FUleXD3Q2rM81FfgxNTEn3ZV50/HwHiGfKzVY=; b=U3tuUlrXkU0PYik4DgaMpL9uwmedgy2Vu16MaSbtxwVzRVFHlkPCeYS3NdwrZUK+ht15f+ pjQXICn3DDkGOBCA== From: Thomas Gleixner To: LKML Cc: Linus Torvalds , Steven Rostedt , Anna-Maria Behnsen , Peter Zijlstra , Stephen Boyd , Guenter Roeck , Andrew Morton , Julia Lawall , Arnd Bergmann , Viresh Kumar , Marc Zyngier , Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz , linux-bluetooth@vger.kernel.org, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org Subject: [patch V2 11/17] Documentation: Replace del_timer/del_timer_sync() References: <20221122171312.191765396@linutronix.de> MIME-Version: 1.0 Date: Tue, 22 Nov 2022 18:45:01 +0100 (CET) Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Adjust to the new preferred function names. Suggested-by: Steven Rostedt Signed-off-by: Thomas Gleixner --- Documentation/RCU/Design/Requirements/Requirements.rst | 2 +- Documentation/core-api/local_ops.rst | 2 +- Documentation/kernel-hacking/locking.rst | 11 +++++------ Documentation/timers/hrtimers.rst | 2 +- Documentation/translations/it_IT/kernel-hacking/locking.rst | 10 +++++----- Documentation/translations/zh_CN/core-api/local_ops.rst | 2 +- 6 files changed, 14 insertions(+), 15 deletions(-) --- a/Documentation/RCU/Design/Requirements/Requirements.rst +++ b/Documentation/RCU/Design/Requirements/Requirements.rst @@ -1858,7 +1858,7 @@ unloaded. After a given module has been one of its functions results in a segmentation fault. The module-unload functions must therefore cancel any delayed calls to loadable-module functions, for example, any outstanding mod_timer() must be dealt -with via del_timer_sync() or similar. +with via timer_delete_sync() or similar. Unfortunately, there is no way to cancel an RCU callback; once you invoke call_rcu(), the callback function is eventually going to be --- a/Documentation/core-api/local_ops.rst +++ b/Documentation/core-api/local_ops.rst @@ -191,7 +191,7 @@ Here is a sample module which implements static void __exit test_exit(void) { - del_timer_sync(&test_timer); + timer_delete_sync(&test_timer); } module_init(test_init); --- a/Documentation/kernel-hacking/locking.rst +++ b/Documentation/kernel-hacking/locking.rst @@ -967,7 +967,7 @@ If you want to destroy the entire collec while (list) { struct foo *next = list->next; - del_timer(&list->timer); + timer_delete(&list->timer); kfree(list); list = next; } @@ -981,7 +981,7 @@ the lock after we spin_unlock_bh(), and the element (which has already been freed!). This can be avoided by checking the result of -del_timer(): if it returns 1, the timer has been deleted. +timer_delete(): if it returns 1, the timer has been deleted. If 0, it means (in this case) that it is currently running, so we can do:: @@ -990,7 +990,7 @@ If 0, it means (in this case) that it is while (list) { struct foo *next = list->next; - if (!del_timer(&list->timer)) { + if (!timer_delete(&list->timer)) { /* Give timer a chance to delete this */ spin_unlock_bh(&list_lock); goto retry; @@ -1005,8 +1005,7 @@ If 0, it means (in this case) that it is Another common problem is deleting timers which restart themselves (by calling add_timer() at the end of their timer function). Because this is a fairly common case which is prone to races, you should -use del_timer_sync() (``include/linux/timer.h``) to -handle this case. +use timer_delete_sync() (``include/linux/timer.h``) to handle this case. Locking Speed ============= @@ -1334,7 +1333,7 @@ lock. - kfree() -- add_timer() and del_timer() +- add_timer() and timer_delete() Mutex API reference =================== --- a/Documentation/timers/hrtimers.rst +++ b/Documentation/timers/hrtimers.rst @@ -118,7 +118,7 @@ existing timer wheel code, as it is matu was not really a win, due to the different data structures. Also, the hrtimer functions now have clearer behavior and clearer names - such as hrtimer_try_to_cancel() and hrtimer_cancel() [which are roughly -equivalent to del_timer() and del_timer_sync()] - so there's no direct +equivalent to timer_delete() and timer_delete_sync()] - so there's no direct 1:1 mapping between them on the algorithmic level, and thus no real potential for code sharing either. --- a/Documentation/translations/it_IT/kernel-hacking/locking.rst +++ b/Documentation/translations/it_IT/kernel-hacking/locking.rst @@ -990,7 +990,7 @@ Se volete eliminare l'intera collezione while (list) { struct foo *next = list->next; - del_timer(&list->timer); + timer_delete(&list->timer); kfree(list); list = next; } @@ -1003,7 +1003,7 @@ e prenderà il *lock* solo dopo spin_unl di eliminare il suo oggetto (che però è già stato eliminato). Questo può essere evitato controllando il valore di ritorno di -del_timer(): se ritorna 1, il temporizzatore è stato già +timer_delete(): se ritorna 1, il temporizzatore è stato già rimosso. Se 0, significa (in questo caso) che il temporizzatore è in esecuzione, quindi possiamo fare come segue:: @@ -1012,7 +1012,7 @@ rimosso. Se 0, significa (in questo caso while (list) { struct foo *next = list->next; - if (!del_timer(&list->timer)) { + if (!timer_delete(&list->timer)) { /* Give timer a chance to delete this */ spin_unlock_bh(&list_lock); goto retry; @@ -1026,7 +1026,7 @@ rimosso. Se 0, significa (in questo caso Un altro problema è l'eliminazione dei temporizzatori che si riavviano da soli (chiamando add_timer() alla fine della loro esecuzione). Dato che questo è un problema abbastanza comune con una propensione -alle corse critiche, dovreste usare del_timer_sync() +alle corse critiche, dovreste usare timer_delete_sync() (``include/linux/timer.h``) per gestire questo caso. Velocità della sincronizzazione @@ -1372,7 +1372,7 @@ contesto, o trattenendo un qualsiasi *lo - kfree() -- add_timer() e del_timer() +- add_timer() e timer_delete() Riferimento per l'API dei Mutex =============================== --- a/Documentation/translations/zh_CN/core-api/local_ops.rst +++ b/Documentation/translations/zh_CN/core-api/local_ops.rst @@ -185,7 +185,7 @@ UP之间没有不同的行为，在你� static void __exit test_exit(void) { - del_timer_sync(&test_timer); + timer_delete_sync(&test_timer); } module_init(test_init);