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ac681835b6
The existing `CondVar` abstraction is a wrapper around `wait_queue_head`, but it does not support all use-cases of the C `wait_queue_head` type. To be specific, a `CondVar` cannot be registered with a `struct poll_table`. This limitation has the advantage that you do not need to call `synchronize_rcu` when destroying a `CondVar`. However, we need the ability to register a `poll_table` with a `wait_queue_head` in Rust Binder. To enable this, introduce a type called `PollCondVar`, which is like `CondVar` except that you can register a `poll_table`. We also introduce `PollTable`, which is a safe wrapper around `poll_table` that is intended to be used with `PollCondVar`. The destructor of `PollCondVar` unconditionally calls `synchronize_rcu` to ensure that the removal of epoll waiters has fully completed before the `wait_queue_head` is destroyed. That said, `synchronize_rcu` is rather expensive and is not needed in all cases: If we have never registered a `poll_table` with the `wait_queue_head`, then we don't need to call `synchronize_rcu`. (And this is a common case in Binder - not all processes use Binder with epoll.) The current implementation does not account for this, but if we find that it is necessary to improve this, a future patch could store a boolean next to the `wait_queue_head` to keep track of whether a `poll_table` has ever been registered. Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Reviewed-by: Trevor Gross <tmgross@umich.edu> Signed-off-by: Alice Ryhl <aliceryhl@google.com> Link: https://lore.kernel.org/r/20240915-alice-file-v10-8-88484f7a3dcf@google.com Signed-off-by: Christian Brauner <brauner@kernel.org>
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Header that contains the code (mostly headers) for which Rust bindings
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* will be automatically generated by `bindgen`.
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*
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* Sorted alphabetically.
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*/
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#include <kunit/test.h>
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#include <linux/blk-mq.h>
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#include <linux/blk_types.h>
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#include <linux/blkdev.h>
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#include <linux/cred.h>
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#include <linux/errname.h>
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#include <linux/ethtool.h>
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#include <linux/file.h>
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#include <linux/firmware.h>
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#include <linux/fs.h>
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#include <linux/jiffies.h>
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#include <linux/mdio.h>
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#include <linux/phy.h>
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#include <linux/pid_namespace.h>
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#include <linux/poll.h>
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#include <linux/refcount.h>
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#include <linux/sched.h>
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#include <linux/security.h>
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#include <linux/slab.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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/* `bindgen` gets confused at certain things. */
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const size_t RUST_CONST_HELPER_ARCH_SLAB_MINALIGN = ARCH_SLAB_MINALIGN;
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const size_t RUST_CONST_HELPER_PAGE_SIZE = PAGE_SIZE;
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const gfp_t RUST_CONST_HELPER_GFP_ATOMIC = GFP_ATOMIC;
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const gfp_t RUST_CONST_HELPER_GFP_KERNEL = GFP_KERNEL;
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const gfp_t RUST_CONST_HELPER_GFP_KERNEL_ACCOUNT = GFP_KERNEL_ACCOUNT;
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const gfp_t RUST_CONST_HELPER_GFP_NOWAIT = GFP_NOWAIT;
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const gfp_t RUST_CONST_HELPER___GFP_ZERO = __GFP_ZERO;
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const gfp_t RUST_CONST_HELPER___GFP_HIGHMEM = ___GFP_HIGHMEM;
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const blk_features_t RUST_CONST_HELPER_BLK_FEAT_ROTATIONAL = BLK_FEAT_ROTATIONAL;
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