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rust: add basic Task

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It is an abstraction for C's `struct task_struct`. It implements
`AlwaysRefCounted`, so the refcount of the wrapped object is managed
safely on the Rust side.

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Link: https://lore.kernel.org/r/20230411054543.21278-9-wedsonaf@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Wedson Almeida Filho
2023-04-11 02:45:39 -03:00
committed by Miguel Ojeda
parent f1fbd6a864
commit 313c4281bc
4 changed files with 96 additions and 0 deletions
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19
rust/helpers.c
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@@ -24,6 +24,7 @@
#include <linux/refcount.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/sched/signal.h>
__noreturn void rust_helper_BUG(void)
{
@@ -60,6 +61,12 @@ void rust_helper_spin_unlock(spinlock_t *lock)
}
EXPORT_SYMBOL_GPL(rust_helper_spin_unlock);
int rust_helper_signal_pending(struct task_struct *t)
{
return signal_pending(t);
}
EXPORT_SYMBOL_GPL(rust_helper_signal_pending);
refcount_t rust_helper_REFCOUNT_INIT(int n)
{
return (refcount_t)REFCOUNT_INIT(n);
@@ -96,6 +103,18 @@ long rust_helper_PTR_ERR(__force const void *ptr)
}
EXPORT_SYMBOL_GPL(rust_helper_PTR_ERR);
void rust_helper_get_task_struct(struct task_struct *t)
{
get_task_struct(t);
}
EXPORT_SYMBOL_GPL(rust_helper_get_task_struct);
void rust_helper_put_task_struct(struct task_struct *t)
{
put_task_struct(t);
}
EXPORT_SYMBOL_GPL(rust_helper_put_task_struct);
/*
* We use `bindgen`'s `--size_t-is-usize` option to bind the C `size_t` type
* as the Rust `usize` type, so we can use it in contexts where Rust