From nobody Mon Oct 6 20:57:09 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BC11720E715 for ; Thu, 17 Jul 2025 18:44:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752777845; cv=none; b=uQpF021gl3A1/M2lNOYSviD94uR8xYPdwIf9QVE1biGlptNgjg35vOS0aNpiAKAG9lE3bSo+ioGlXaQnnwpbV7G8Q46XOTZAuoOPDsAXjiWRLxZAvbUHd2uzfyPvIOsltD382l1vzDHknYWU7Ld+KUAXVPyOW4+epiLOOCSqROg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752777845; c=relaxed/simple; bh=KhyXpdrnNRmZJArqvpnD6zxS4VpNg0NEmUn14oARH58=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ezG/63hPfpNb62+xZMGoXVtNJyZP8Ud2aYbYiqZC+iELBqARI8vs7o+b1F7XpSPXweMcmr5M56bptSJmNdMZFEEMgxF1ySsRBKfiEIJO6ly6XlSrcfdm1ofgvnCKiB1o7LdekueYXjvrwGS3bDj4wrNFwFmF3kMAyjTNlNkowS4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=bLzKCYc7; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bLzKCYc7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1752777843; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ikpxnE4FqOnYzLdJmrDCnds8Pt84GEOTjPbssWEskjg=; b=bLzKCYc7SCQum+Ubzrzh8axOJMw768cAMxk5q7jezWSAsajEcbKKqbXCv3aykpoQKx+lE1 7pZF3s2IZ13D/bRcaqyfF8WjzQ+jhJNH35CT3h1W8KcEyGerzla7hE636DruGBoI7KarhS gNEa8cOzyzpr9oCOAFlTaUXWxOVeVQY= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-173-mp_ApW7aN-KlrzbkY95wmA-1; Thu, 17 Jul 2025 14:43:59 -0400 X-MC-Unique: mp_ApW7aN-KlrzbkY95wmA-1 X-Mimecast-MFC-AGG-ID: mp_ApW7aN-KlrzbkY95wmA_1752777837 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 32EBF197730A; Thu, 17 Jul 2025 18:43:57 +0000 (UTC) Received: from chopper.redhat.com (unknown [10.22.66.69]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2450930001B1; Thu, 17 Jul 2025 18:43:51 +0000 (UTC) From: Lyude Paul To: rust-for-linux@vger.kernel.org, Thomas Gleixner , Boqun Feng , linux-kernel@vger.kernel.org, Daniel Almeida Cc: Peter Zijlstra , Ingo Molnar , Will Deacon , Waiman Long , Miguel Ojeda , Alex Gaynor , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich Subject: [PATCH v11 12/14] rust: sync: lock/global: Add Backend parameter to GlobalGuard Date: Thu, 17 Jul 2025 14:38:04 -0400 Message-ID: <20250717184055.2071216-13-lyude@redhat.com> In-Reply-To: <20250717184055.2071216-1-lyude@redhat.com> References: <20250717184055.2071216-1-lyude@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" Due to the introduction of sync::lock::Backend::Context, it's now possible for normal locks to return a Guard with a different Backend than their respective lock (e.g. Backend::BackendInContext). We want to be able to support global locks with contexts as well, so add a trait bound to explicitly specify which Backend is in use for a GlobalGuard. Signed-off-by: Lyude Paul --- rust/kernel/sync/lock/global.rs | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/rust/kernel/sync/lock/global.rs b/rust/kernel/sync/lock/global= .rs index f846ecf9168e7..f9a9c4bdc46b0 100644 --- a/rust/kernel/sync/lock/global.rs +++ b/rust/kernel/sync/lock/global.rs @@ -77,14 +77,14 @@ pub unsafe fn init(&'static self) { } =20 /// Lock this global lock. - pub fn lock(&'static self) -> GlobalGuard<'static, G> { + pub fn lock(&'static self) -> GlobalGuard<'static, G, G::Backend> { GlobalGuard { inner: self.inner.lock(), } } =20 /// Try to lock this global lock. - pub fn try_lock(&'static self) -> Option> { + pub fn try_lock(&'static self) -> Option> { Some(GlobalGuard { inner: self.inner.try_lock()?, }) @@ -94,11 +94,11 @@ pub fn try_lock(&'static self) -> Option> { /// A guard for a [`GlobalLock`]. /// /// See [`global_lock!`] for examples. -pub struct GlobalGuard<'a, G: GlobalLockBackend> { - inner: Guard<'a, G::Item, G::Backend>, +pub struct GlobalGuard<'a, G: GlobalLockBackend, B: Backend> { + inner: Guard<'a, G::Item, B>, } =20 -impl<'a, G: GlobalLockBackend> core::ops::Deref for GlobalGuard<'a, G> { +impl<'a, G: GlobalLockBackend, B: Backend> core::ops::Deref for GlobalGuar= d<'a, G, B> { type Target =3D G::Item; =20 fn deref(&self) -> &Self::Target { @@ -106,7 +106,7 @@ fn deref(&self) -> &Self::Target { } } =20 -impl<'a, G: GlobalLockBackend> core::ops::DerefMut for GlobalGuard<'a, G> { +impl<'a, G: GlobalLockBackend, B: Backend> core::ops::DerefMut for GlobalG= uard<'a, G, B> { fn deref_mut(&mut self) -> &mut Self::Target { &mut self.inner } @@ -154,7 +154,7 @@ impl GlobalLockedBy { /// Access the value immutably. /// /// The caller must prove shared access to the lock. - pub fn as_ref<'a>(&'a self, _guard: &'a GlobalGuard<'_, G>) -> &'a T { + pub fn as_ref<'a, B: Backend>(&'a self, _guard: &'a GlobalGuard<'_, G,= B>) -> &'a T { // SAFETY: The lock is globally unique, so there can only be one g= uard. unsafe { &*self.value.get() } } @@ -162,7 +162,7 @@ pub fn as_ref<'a>(&'a self, _guard: &'a GlobalGuard<'_,= G>) -> &'a T { /// Access the value mutably. /// /// The caller must prove shared exclusive to the lock. - pub fn as_mut<'a>(&'a self, _guard: &'a mut GlobalGuard<'_, G>) -> &'a= mut T { + pub fn as_mut<'a, B: Backend>(&'a self, _guard: &'a mut GlobalGuard<'_= , G, B>) -> &'a mut T { // SAFETY: The lock is globally unique, so there can only be one g= uard. unsafe { &mut *self.value.get() } } @@ -216,7 +216,7 @@ pub fn get_mut(&mut self) -> &mut T { /// ``` /// # mod ex { /// # use kernel::prelude::*; -/// use kernel::sync::{GlobalGuard, GlobalLockedBy}; +/// use kernel::sync::{Backend, GlobalGuard, GlobalLockedBy}; /// /// kernel::sync::global_lock! { /// // SAFETY: Initialized in module initializer before first use. @@ -232,7 +232,7 @@ pub fn get_mut(&mut self) -> &mut T { /// /// Increment the counter in this instance. /// /// /// /// The caller must hold the `MY_MUTEX` mutex. -/// fn increment(&self, guard: &mut GlobalGuard<'_, MY_MUTEX>) -> u32 { +/// fn increment(&self, guard: &mut GlobalGuard<'_, MY_MUT= EX, B>) -> u32 { /// let my_counter =3D self.my_counter.as_mut(guard); /// *my_counter +=3D 1; /// *my_counter --=20 2.50.0