Re: [PATCH v4 28/39] unwind_user/deferred: Add deferred unwinding interface

Jens Remus
2025-01-24T16:36:09Z

On 22.01.2025 03:31, Josh Poimboeuf wrote:

> diff --git a/include/linux/unwind_deferred.h b/include/linux/unwind_deferred.h

> +#ifdef CONFIG_UNWIND_USER
> +
> +void unwind_task_init(struct task_struct *task);
> +void unwind_task_free(struct task_struct *task);
> +
> +void unwind_deferred_init(struct unwind_work *work, unwind_callback_t func);
> +int unwind_deferred_request(struct unwind_work *work, u64 *cookie);
> +bool unwind_deferred_cancel(struct task_struct *task, struct unwind_work *work);
> +
> +static __always_inline void unwind_enter_from_user_mode(void)
> +{
> + current->unwind_info.cookie = 0;
> +}
> +
> +#else /* !CONFIG_UNWIND_USER */
> +
> +static inline void unwind_task_init(struct task_struct *task) {}
> +static inline void unwind_task_free(struct task_struct *task) {}
> +
> +static inline void unwind_deferred_init(struct unwind_work *work, unwind_callback_t func) {}
> +static inline int unwind_deferred_request(struct task_struct *task, struct unwind_work *work, u64 *cookie) { return -ENOSYS; }

static inline int unwind_deferred_request(struct unwind_work *work, u64 *cookie) { return -ENOSYS; }

Otherwise this does not compile on architectures that do not enable
UNWIND_USER.

> +static inline bool unwind_deferred_cancel(struct task_struct *task, struct unwind_work *work) { return false; }
> +
> +static inline void unwind_enter_from_user_mode(void) {}
> +
> +#endif /* !CONFIG_UNWIND_USER */

Regards,
Jens
--
Jens Remus
Linux on Z Development (D3303)
+49-7031-16-1128 Office
jremus@de.ibm.com

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