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12  * scheme where we can return either an error code or a normal
23  * IS_ERR_VALUE - Detect an error pointer.
31  * ERR_PTR - Create an error pointer.
48  * PTR_ERR - Extract the error code from an error pointer.
49  * @ptr: An error pointer.
57 /* Read an error pointer from the percpu address space. */
61  * IS_ERR - Detect an error pointer.
63  * Return: true if @ptr is an error pointer, false otherwise.
70 /* Read an error pointer from the percpu address space. */
74  * IS_ERR_OR_NULL - Detect an error pointer or a null pointer.
85  * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
88  * Explicitly cast an error-valued pointer to another pointer type in such a
102  * an error code to propagate errors received as error pointers.
112  * Return: The error code within @ptr if it is an error pointer; 0 otherwise.