Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Sat, 31 Dec 2022 19:55:08 +0000
From:   Gary Guo <gary@garyguo.net>
To:     Wedson Almeida Filho <wedsonaf@gmail.com>
Cc:     rust-for-linux@vger.kernel.org, Miguel Ojeda <ojeda@kernel.org>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        =?UTF-8?B?QmrDtnJu?= Roy Baron <bjorn3_gh@protonmail.com>,
        linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH 1/7] rust: sync: add `Arc` for ref-counted allocations
Message-ID: <20221231195508.7783a774.gary@garyguo.net>
In-Reply-To: <20221228060346.352362-1-wedsonaf@gmail.com>
References: <20221228060346.352362-1-wedsonaf@gmail.com>
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Vxa4fWq2cZumHsa7oRR0p3eB4F+I0naGx2NI4keIQ3aI7ckkHexSTtPVWnwe?=
 =?us-ascii?Q?QlmADWe62M7WfvN6SLYYhjlK+wSyuo7ipPMPhXyI9dxxfe3TlXa1GDq90u9G?=
 =?us-ascii?Q?gEhyOcgLD2NZL+bDzNBvZpJuAxW2Wc3JtOhs7ju+KXblRT5t4k8o4wil8qxs?=
 =?us-ascii?Q?VPPwdT3lVNwl8uyiRvXzkXpP1/XsupPu/VWA5klOmnfR4M2H+9C+sdGNknit?=
 =?us-ascii?Q?pI4ti8KEfBBb9s6Dh7x0xhAfP9hugJLYquxj5iec7xn2cHRUQ9Eq3Hmwe0Mu?=
 =?us-ascii?Q?zI3HYzGe86ht1pMs5WNiKYHAihkOpyAo3/iaJYHIdBU+dTBVshO9lmWTglN7?=
 =?us-ascii?Q?+cFdl1a3aQctKFpw+uuBBMUTDYxvTmpKk6HzAU8hNCebKocIlIlQodoPdNjG?=
 =?us-ascii?Q?mZd8sdHPzJYOKz8pir5+jPjg10tXoJJprfG8F0xirb2lvLkYpffGYp7ybqr7?=
 =?us-ascii?Q?YthleJuuyzaHr40fjfbAPmPJRpOQa3g2BhU9Y9Ud49AkezPLxs6ccTNLVB5X?=
 =?us-ascii?Q?wPtqfYdNDxX0KhVeJi9TynQ4X3lVMHc5rEHcINwY6Ud/tmyRhKjP7ky2Rx7w?=
 =?us-ascii?Q?Nv8ksfTmfS0O2NIP4U2KXWvt7Txi/Usoa1dHA+wJ5+sy89RNG7WsRPK+Lnmw?=
 =?us-ascii?Q?YXCU7HVq9dDMsVCVg8Dm1prqQ8f8HKwo+tPDbwrrqaWOhjgBrKFj67UUexji?=
 =?us-ascii?Q?hmXvynlNqgGRrojvHIR5VDSsUirI4SnJBeKC0QxF2q8g5aBDeqej+A3SwFgU?=
 =?us-ascii?Q?7O0kB60R1E/GewtnrT+pQC8pIf5Bc4Npl0Hhw5hNKhpD0pxMNfjetHVcKH8i?=
 =?us-ascii?Q?2bXkrVme/qTeueHeydSd3XnZynuBBa7KCs9piUw+f0URdFRxTeJOVdUWptxC?=
 =?us-ascii?Q?x28+f0Y2q528qqHaPSqHvoKmQgwkWW8TbL0LempUnuCmFf5BDBEwBEJ81+HK?=
 =?us-ascii?Q?LTX6fzVx6QNxY95vh3Nizz4HP8vviUtjwfRHBkcc+GPtzBH/DH4R6lmtGW6e?=
 =?us-ascii?Q?tzsLA0y+31OZAu05Qulz//SWxSmtD6y8MpEiSAtbbFaM70zs3cnVsjy1NqHk?=
 =?us-ascii?Q?7FSqozHW4CqB1L5ZYZJ/8IQHZWVxvsRV8XTc6aLe7J/smZZeF+kCi1iblKhL?=
 =?us-ascii?Q?2IwQ9XVejFxUp4ZybiYmq/4vkEUKXwaWMQNguhrtKXXqs38uvJgG0BYMGLmW?=
 =?us-ascii?Q?UzRk8yXZAXZRPWPF9CT18uJo5k9KPcdCYckkeR+OmaL/a4E9h7+dzMpyj00d?=
 =?us-ascii?Q?qHls1CfYYw19kOtzpOW6Ib73W4gmKpkhhyihGQgpW4/enDL95rC+UwSlrDS4?=
 =?us-ascii?Q?7BAYsV0gNEMKmCokCjsxc2wBDvQ1J6DdtUTy8j89isZF2eSaXDdnP4GFjYso?=
 =?us-ascii?Q?kjUjNd9B5f3na8R6VhadOlZmByXtcrxNFxcqOmHb3Bq84kpTfzw6I1OQTE/I?=
 =?us-ascii?Q?31MPP/GuX5fCTxvuoXR4wrTuSkiuVy28CNBoRHXlE/ODqOuN79XdOGApaZUL?=
 =?us-ascii?Q?CTJg8viNRJekOStn+WuCxCRpV5uFuRDD6w7Ing7eXIb1rlHs9JEC9uyshL8z?=
 =?us-ascii?Q?YdSW0YxcQHVqkbOy9tI=3D?=
X-OriginatorOrg: garyguo.net
X-MS-Exchange-CrossTenant-Network-Message-Id: e4ea7cba-8f15-4346-3a4e-08daeb68ebd7
X-MS-Exchange-CrossTenant-AuthSource: LO2P265MB5183.GBRP265.PROD.OUTLOOK.COM
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Dec 2022 19:55:09.3473
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: bbc898ad-b10f-4e10-8552-d9377b823d45
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: jHuURqk9XXeS2NJYgq8kbbeekx62SR8NMKcbyzyBuKC5e9HVmdc79i1+0dDu4f4M4O1iKoJjdt6Ck36Rnz2SKQ==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: LOYP265MB2096
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham
        autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, 28 Dec 2022 06:03:40 +0000
Wedson Almeida Filho <wedsonaf@gmail.com> wrote:

> This is a basic implementation of `Arc` backed by C's `refcount_t`. It
> allows Rust code to idiomatically allocate memory that is ref-counted.
> 
> Cc: Will Deacon <will@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Boqun Feng <boqun.feng@gmail.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>

Reviewed-by: Gary Guo <gary@garyguo.net>

> ---
>  rust/bindings/bindings_helper.h |   1 +
>  rust/bindings/lib.rs            |   1 +
>  rust/helpers.c                  |  19 ++++
>  rust/kernel/lib.rs              |   1 +
>  rust/kernel/sync.rs             |  10 ++
>  rust/kernel/sync/arc.rs         | 157 ++++++++++++++++++++++++++++++++
>  6 files changed, 189 insertions(+)
>  create mode 100644 rust/kernel/sync.rs
>  create mode 100644 rust/kernel/sync/arc.rs