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    Subject[PATCH v8 09/31] rust: add C helpers
    Date
    This source file contains forwarders to C macros and inlined
    functions.

    Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
    Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
    Co-developed-by: Geoffrey Thomas <geofft@ldpreload.com>
    Signed-off-by: Geoffrey Thomas <geofft@ldpreload.com>
    Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
    Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
    Co-developed-by: Sven Van Asbroeck <thesven73@gmail.com>
    Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com>
    Co-developed-by: Gary Guo <gary@garyguo.net>
    Signed-off-by: Gary Guo <gary@garyguo.net>
    Co-developed-by: Boqun Feng <boqun.feng@gmail.com>
    Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
    Co-developed-by: Maciej Falkowski <m.falkowski@samsung.com>
    Signed-off-by: Maciej Falkowski <m.falkowski@samsung.com>
    Co-developed-by: Wei Liu <wei.liu@kernel.org>
    Signed-off-by: Wei Liu <wei.liu@kernel.org>
    Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
    ---
    rust/helpers.c | 679 +++++++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 679 insertions(+)
    create mode 100644 rust/helpers.c

    diff --git a/rust/helpers.c b/rust/helpers.c
    new file mode 100644
    index 000000000000..bf790f46c763
    --- /dev/null
    +++ b/rust/helpers.c
    @@ -0,0 +1,679 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * Non-trivial C macros cannot be used in Rust. Similarly, inlined C functions
    + * cannot be called either. This file explicitly creates functions ("helpers")
    + * that wrap those so that they can be called from Rust.
    + *
    + * Even though Rust kernel modules should never use directly the bindings, some
    + * of these helpers need to be exported because Rust generics and inlined
    + * functions may not get their code generated in the crate where they are
    + * defined. Other helpers, called from non-inline functions, may not be
    + * exported, in principle. However, in general, the Rust compiler does not
    + * guarantee codegen will be performed for a non-inline function either.
    + * Therefore, this file exports all the helpers. In the future, this may be
    + * revisited to reduce the number of exports after the compiler is informed
    + * about the places codegen is required.
    + *
    + * All symbols are exported as GPL-only to guarantee no GPL-only feature is
    + * accidentally exposed.
    + */
    +
    +#include <linux/amba/bus.h>
    +#include <linux/bug.h>
    +#include <linux/build_bug.h>
    +#include <linux/clk.h>
    +#include <linux/errname.h>
    +#include <linux/fs_parser.h>
    +#include <linux/gfp.h>
    +#include <linux/highmem.h>
    +#include <linux/io.h>
    +#include <linux/irqchip/chained_irq.h>
    +#include <linux/irqdomain.h>
    +#include <linux/irq.h>
    +#include <linux/mutex.h>
    +#include <linux/netdevice.h>
    +#include <linux/of_device.h>
    +#include <linux/platform_device.h>
    +#include <linux/sched/signal.h>
    +#include <linux/security.h>
    +#include <linux/skbuff.h>
    +#include <linux/uaccess.h>
    +#include <linux/uio.h>
    +
    +__noreturn void rust_helper_BUG(void)
    +{
    + BUG();
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_BUG);
    +
    +void rust_helper_clk_disable_unprepare(struct clk *clk)
    +{
    + return clk_disable_unprepare(clk);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_clk_disable_unprepare);
    +
    +int rust_helper_clk_prepare_enable(struct clk *clk)
    +{
    + return clk_prepare_enable(clk);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_clk_prepare_enable);
    +
    +unsigned long rust_helper_copy_from_user(void *to, const void __user *from, unsigned long n)
    +{
    + return copy_from_user(to, from, n);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_copy_from_user);
    +
    +unsigned long rust_helper_copy_to_user(void __user *to, const void *from, unsigned long n)
    +{
    + return copy_to_user(to, from, n);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_copy_to_user);
    +
    +unsigned long rust_helper_clear_user(void __user *to, unsigned long n)
    +{
    + return clear_user(to, n);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_clear_user);
    +
    +void __iomem *rust_helper_ioremap(resource_size_t offset, unsigned long size)
    +{
    + return ioremap(offset, size);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_ioremap);
    +
    +u8 rust_helper_readb(const volatile void __iomem *addr)
    +{
    + return readb(addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_readb);
    +
    +u16 rust_helper_readw(const volatile void __iomem *addr)
    +{
    + return readw(addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_readw);
    +
    +u32 rust_helper_readl(const volatile void __iomem *addr)
    +{
    + return readl(addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_readl);
    +
    +#ifdef CONFIG_64BIT
    +u64 rust_helper_readq(const volatile void __iomem *addr)
    +{
    + return readq(addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_readq);
    +#endif
    +
    +void rust_helper_writeb(u8 value, volatile void __iomem *addr)
    +{
    + writeb(value, addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_writeb);
    +
    +void rust_helper_writew(u16 value, volatile void __iomem *addr)
    +{
    + writew(value, addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_writew);
    +
    +void rust_helper_writel(u32 value, volatile void __iomem *addr)
    +{
    + writel(value, addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_writel);
    +
    +#ifdef CONFIG_64BIT
    +void rust_helper_writeq(u64 value, volatile void __iomem *addr)
    +{
    + writeq(value, addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_writeq);
    +#endif
    +
    +u8 rust_helper_readb_relaxed(const volatile void __iomem *addr)
    +{
    + return readb_relaxed(addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_readb_relaxed);
    +
    +u16 rust_helper_readw_relaxed(const volatile void __iomem *addr)
    +{
    + return readw_relaxed(addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_readw_relaxed);
    +
    +u32 rust_helper_readl_relaxed(const volatile void __iomem *addr)
    +{
    + return readl_relaxed(addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_readl_relaxed);
    +
    +#ifdef CONFIG_64BIT
    +u64 rust_helper_readq_relaxed(const volatile void __iomem *addr)
    +{
    + return readq_relaxed(addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_readq_relaxed);
    +#endif
    +
    +void rust_helper_writeb_relaxed(u8 value, volatile void __iomem *addr)
    +{
    + writeb_relaxed(value, addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_writeb_relaxed);
    +
    +void rust_helper_writew_relaxed(u16 value, volatile void __iomem *addr)
    +{
    + writew_relaxed(value, addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_writew_relaxed);
    +
    +void rust_helper_writel_relaxed(u32 value, volatile void __iomem *addr)
    +{
    + writel_relaxed(value, addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_writel_relaxed);
    +
    +#ifdef CONFIG_64BIT
    +void rust_helper_writeq_relaxed(u64 value, volatile void __iomem *addr)
    +{
    + writeq_relaxed(value, addr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_writeq_relaxed);
    +#endif
    +
    +void rust_helper_memcpy_fromio(void *to, const volatile void __iomem *from, long count)
    +{
    + memcpy_fromio(to, from, count);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_memcpy_fromio);
    +
    +void rust_helper___spin_lock_init(spinlock_t *lock, const char *name,
    + struct lock_class_key *key)
    +{
    +#ifdef CONFIG_DEBUG_SPINLOCK
    + __spin_lock_init(lock, name, key);
    +#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);
    +
    +unsigned long rust_helper_spin_lock_irqsave(spinlock_t *lock)
    +{
    + unsigned long flags;
    +
    + spin_lock_irqsave(lock, flags);
    +
    + return flags;
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_spin_lock_irqsave);
    +
    +void rust_helper_spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
    +{
    + spin_unlock_irqrestore(lock, flags);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_spin_unlock_irqrestore);
    +
    +void rust_helper__raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
    + struct lock_class_key *key)
    +{
    +#ifdef CONFIG_DEBUG_SPINLOCK
    + _raw_spin_lock_init(lock, name, key);
    +#else
    + raw_spin_lock_init(lock);
    +#endif
    +}
    +EXPORT_SYMBOL_GPL(rust_helper__raw_spin_lock_init);
    +
    +void rust_helper_raw_spin_lock(raw_spinlock_t *lock)
    +{
    + raw_spin_lock(lock);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_raw_spin_lock);
    +
    +void rust_helper_raw_spin_unlock(raw_spinlock_t *lock)
    +{
    + raw_spin_unlock(lock);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_raw_spin_unlock);
    +
    +unsigned long rust_helper_raw_spin_lock_irqsave(raw_spinlock_t *lock)
    +{
    + unsigned long flags;
    +
    + raw_spin_lock_irqsave(lock, flags);
    +
    + return flags;
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_raw_spin_lock_irqsave);
    +
    +void rust_helper_raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
    + unsigned long flags)
    +{
    + raw_spin_unlock_irqrestore(lock, flags);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_raw_spin_unlock_irqrestore);
    +
    +void rust_helper_init_wait(struct wait_queue_entry *wq_entry)
    +{
    + init_wait(wq_entry);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_init_wait);
    +
    +void rust_helper_init_waitqueue_func_entry(struct wait_queue_entry *wq_entry,
    + wait_queue_func_t func)
    +{
    + init_waitqueue_func_entry(wq_entry, func);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_init_waitqueue_func_entry);
    +
    +int rust_helper_signal_pending(struct task_struct *t)
    +{
    + return signal_pending(t);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_signal_pending);
    +
    +struct page *rust_helper_alloc_pages(gfp_t gfp_mask, unsigned int order)
    +{
    + return alloc_pages(gfp_mask, order);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_alloc_pages);
    +
    +void *rust_helper_kmap(struct page *page)
    +{
    + return kmap(page);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_kmap);
    +
    +void rust_helper_kunmap(struct page *page)
    +{
    + return kunmap(page);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_kunmap);
    +
    +int rust_helper_cond_resched(void)
    +{
    + return cond_resched();
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_cond_resched);
    +
    +size_t rust_helper_copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
    +{
    + return copy_from_iter(addr, bytes, i);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_copy_from_iter);
    +
    +size_t rust_helper_copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
    +{
    + return copy_to_iter(addr, bytes, i);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_copy_to_iter);
    +
    +bool rust_helper_IS_ERR(__force const void *ptr)
    +{
    + return IS_ERR(ptr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_IS_ERR);
    +
    +long rust_helper_PTR_ERR(__force const void *ptr)
    +{
    + return PTR_ERR(ptr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_PTR_ERR);
    +
    +const char *rust_helper_errname(int err)
    +{
    + return errname(err);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_errname);
    +
    +void rust_helper_mutex_lock(struct mutex *lock)
    +{
    + mutex_lock(lock);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_mutex_lock);
    +
    +void rust_helper_amba_set_drvdata(struct amba_device *dev, void *data)
    +{
    + amba_set_drvdata(dev, data);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_amba_set_drvdata);
    +
    +void *rust_helper_amba_get_drvdata(struct amba_device *dev)
    +{
    + return amba_get_drvdata(dev);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_amba_get_drvdata);
    +
    +void *
    +rust_helper_platform_get_drvdata(const struct platform_device *pdev)
    +{
    + return platform_get_drvdata(pdev);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_platform_get_drvdata);
    +
    +void
    +rust_helper_platform_set_drvdata(struct platform_device *pdev,
    + void *data)
    +{
    + return platform_set_drvdata(pdev, data);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_platform_set_drvdata);
    +
    +refcount_t rust_helper_REFCOUNT_INIT(int n)
    +{
    + return (refcount_t)REFCOUNT_INIT(n);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_REFCOUNT_INIT);
    +
    +void rust_helper_refcount_inc(refcount_t *r)
    +{
    + refcount_inc(r);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_refcount_inc);
    +
    +bool rust_helper_refcount_dec_and_test(refcount_t *r)
    +{
    + return refcount_dec_and_test(r);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_refcount_dec_and_test);
    +
    +void rust_helper_rb_link_node(struct rb_node *node, struct rb_node *parent,
    + struct rb_node **rb_link)
    +{
    + rb_link_node(node, parent, rb_link);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_rb_link_node);
    +
    +struct task_struct *rust_helper_get_current(void)
    +{
    + return current;
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_get_current);
    +
    +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);
    +
    +int rust_helper_security_binder_set_context_mgr(const struct cred *mgr)
    +{
    + return security_binder_set_context_mgr(mgr);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_security_binder_set_context_mgr);
    +
    +int rust_helper_security_binder_transaction(const struct cred *from,
    + const struct cred *to)
    +{
    + return security_binder_transaction(from, to);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_security_binder_transaction);
    +
    +int rust_helper_security_binder_transfer_binder(const struct cred *from,
    + const struct cred *to)
    +{
    + return security_binder_transfer_binder(from, to);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_security_binder_transfer_binder);
    +
    +int rust_helper_security_binder_transfer_file(const struct cred *from,
    + const struct cred *to,
    + struct file *file)
    +{
    + return security_binder_transfer_file(from, to, file);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_security_binder_transfer_file);
    +
    +struct file *rust_helper_get_file(struct file *f)
    +{
    + return get_file(f);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_get_file);
    +
    +void rust_helper_rcu_read_lock(void)
    +{
    + rcu_read_lock();
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_rcu_read_lock);
    +
    +void rust_helper_rcu_read_unlock(void)
    +{
    + rcu_read_unlock();
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_rcu_read_unlock);
    +
    +void rust_helper_synchronize_rcu(void)
    +{
    + synchronize_rcu();
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_synchronize_rcu);
    +
    +void *rust_helper_dev_get_drvdata(struct device *dev)
    +{
    + return dev_get_drvdata(dev);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_dev_get_drvdata);
    +
    +const char *rust_helper_dev_name(const struct device *dev)
    +{
    + return dev_name(dev);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_dev_name);
    +
    +void rust_helper___seqcount_init(seqcount_t *s, const char *name,
    + struct lock_class_key *key)
    +{
    + __seqcount_init(s, name, key);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper___seqcount_init);
    +
    +unsigned rust_helper_read_seqcount_begin(seqcount_t *s)
    +{
    + return read_seqcount_begin(s);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_read_seqcount_begin);
    +
    +int rust_helper_read_seqcount_retry(seqcount_t *s, unsigned start)
    +{
    + return read_seqcount_retry(s, start);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_read_seqcount_retry);
    +
    +void rust_helper_write_seqcount_begin(seqcount_t *s)
    +{
    + do_write_seqcount_begin(s);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_write_seqcount_begin);
    +
    +void rust_helper_write_seqcount_end(seqcount_t *s)
    +{
    + do_write_seqcount_end(s);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_write_seqcount_end);
    +
    +void rust_helper_irq_set_handler_locked(struct irq_data *data,
    + irq_flow_handler_t handler)
    +{
    + irq_set_handler_locked(data, handler);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_irq_set_handler_locked);
    +
    +void *rust_helper_irq_data_get_irq_chip_data(struct irq_data *d)
    +{
    + return irq_data_get_irq_chip_data(d);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_irq_data_get_irq_chip_data);
    +
    +struct irq_chip *rust_helper_irq_desc_get_chip(struct irq_desc *desc)
    +{
    + return irq_desc_get_chip(desc);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_irq_desc_get_chip);
    +
    +void *rust_helper_irq_desc_get_handler_data(struct irq_desc *desc)
    +{
    + return irq_desc_get_handler_data(desc);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_irq_desc_get_handler_data);
    +
    +void rust_helper_chained_irq_enter(struct irq_chip *chip,
    + struct irq_desc *desc)
    +{
    + chained_irq_enter(chip, desc);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_chained_irq_enter);
    +
    +void rust_helper_chained_irq_exit(struct irq_chip *chip,
    + struct irq_desc *desc)
    +{
    + chained_irq_exit(chip, desc);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_chained_irq_exit);
    +
    +const struct cred *rust_helper_get_cred(const struct cred *cred)
    +{
    + return get_cred(cred);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_get_cred);
    +
    +void rust_helper_put_cred(const struct cred *cred)
    +{
    + put_cred(cred);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_put_cred);
    +
    +const struct of_device_id *rust_helper_of_match_device(
    + const struct of_device_id *matches, const struct device *dev)
    +{
    + return of_match_device(matches, dev);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_of_match_device);
    +
    +void rust_helper_init_completion(struct completion *c)
    +{
    + init_completion(c);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_init_completion);
    +
    +struct sk_buff *rust_helper_skb_get(struct sk_buff *skb)
    +{
    + return skb_get(skb);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_skb_get);
    +
    +unsigned int rust_helper_skb_headlen(const struct sk_buff *skb)
    +{
    + return skb_headlen(skb);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_skb_headlen);
    +
    +void rust_helper_dev_hold(struct net_device *dev)
    +{
    + return dev_hold(dev);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_dev_hold);
    +
    +void rust_helper_dev_put(struct net_device *dev)
    +{
    + return dev_put(dev);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_dev_put);
    +
    +struct net *rust_helper_get_net(struct net *net)
    +{
    + return get_net(net);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_get_net);
    +
    +void rust_helper_put_net(struct net *net)
    +{
    + return put_net(net);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_put_net);
    +
    +unsigned int rust_helper_NF_QUEUE_NR(unsigned int n)
    +{
    + return NF_QUEUE_NR(n);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_NF_QUEUE_NR);
    +
    +void rust_helper___INIT_WORK_WITH_KEY(struct work_struct *work,
    + work_func_t func, bool on_stack, struct lock_class_key *key)
    +{
    + __INIT_WORK_WITH_KEY(work, func, on_stack, key);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper___INIT_WORK_WITH_KEY);
    +
    +struct dentry *rust_helper_dget(struct dentry *dentry)
    +{
    + return dget(dentry);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_dget);
    +
    +void rust_helper_lockdep_register_key(struct lock_class_key *key)
    +{
    + lockdep_register_key(key);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_lockdep_register_key);
    +
    +void rust_helper_lockdep_unregister_key(struct lock_class_key *key)
    +{
    + lockdep_unregister_key(key);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_lockdep_unregister_key);
    +
    +int rust_helper_fs_parse(struct fs_context *fc,
    + const struct fs_parameter_spec *desc,
    + struct fs_parameter *param,
    + struct fs_parse_result *result)
    +{
    + return fs_parse(fc, desc, param, result);
    +}
    +EXPORT_SYMBOL_GPL(rust_helper_fs_parse);
    +
    +/*
    + * 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
    + * expects a `usize` like slice (array) indices. `usize` is defined to be
    + * the same as C's `uintptr_t` type (can hold any pointer) but not
    + * necessarily the same as `size_t` (can hold the size of any single
    + * object). Most modern platforms use the same concrete integer type for
    + * both of them, but in case we find ourselves on a platform where
    + * that's not true, fail early instead of risking ABI or
    + * integer-overflow issues.
    + *
    + * If your platform fails this assertion, it means that you are in
    + * danger of integer-overflow bugs (even if you attempt to remove
    + * `--size_t-is-usize`). It may be easiest to change the kernel ABI on
    + * your platform such that `size_t` matches `uintptr_t` (i.e., to increase
    + * `size_t`, because `uintptr_t` has to be at least as big as `size_t`).
    + */
    +static_assert(
    + sizeof(size_t) == sizeof(uintptr_t) &&
    + __alignof__(size_t) == __alignof__(uintptr_t),
    + "Rust code expects C `size_t` to match Rust `usize`"
    +);
    --
    2.37.1
    \
     
     \ /
      Last update: 2022-08-02 03:54    [W:4.133 / U:0.300 seconds]
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