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rust: lock: introduce SpinLock

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This is the `spinlock_t` lock backend and allows Rust code to use the
kernel spinlock idiomatically.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Link: https://lore.kernel.org/r/20230419174426.132207-1-wedsonaf@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Wedson Almeida Filho
2023-04-19 14:44:26 -03:00
committed by Miguel Ojeda
parent 6d20d629c6
commit c6d917a498
4 changed files with 142 additions and 1 deletions
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24
rust/helpers.c
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@@ -23,6 +23,7 @@
#include <linux/err.h>
#include <linux/refcount.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
__noreturn void rust_helper_BUG(void)
{
@@ -36,6 +37,29 @@ void rust_helper_mutex_lock(struct mutex *lock)
}
EXPORT_SYMBOL_GPL(rust_helper_mutex_lock);
void rust_helper___spin_lock_init(spinlock_t *lock, const char *name,
struct lock_class_key *key)
{
#ifdef CONFIG_DEBUG_SPINLOCK
__raw_spin_lock_init(spinlock_check(lock), name, key, LD_WAIT_CONFIG);
#else
spin_lock_init(lock);
#endif
}
EXPORT_SYMBOL_GPL(rust_helper___spin_lock_init);
void rust_helper_spin_lock(spinlock_t *lock)
{
spin_lock(lock);
}
EXPORT_SYMBOL_GPL(rust_helper_spin_lock);
void rust_helper_spin_unlock(spinlock_t *lock)
{
spin_unlock(lock);
}
EXPORT_SYMBOL_GPL(rust_helper_spin_unlock);
refcount_t rust_helper_REFCOUNT_INIT(int n)
{
return (refcount_t)REFCOUNT_INIT(n);