FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/config/kernel-proc-operations.m4

     dnl #
     dnl # 5.6 API Change
     dnl # The proc_ops structure was introduced to replace the use of
     dnl # of the file_operations structure when registering proc handlers.
     dnl #
     AC_DEFUN([ZFS_AC_KERNEL_SRC_PROC_OPERATIONS], [
             ZFS_LINUX_TEST_SRC([proc_ops_struct], [
                     #include <linux/proc_fs.h>
     
                    int test_open(struct inode *ip, struct file *fp) { return 0; }
                    ssize_t test_read(struct file *fp, char __user *ptr,
                        size_t size, loff_t *offp) { return 0; }
                    ssize_t test_write(struct file *fp, const char __user *ptr,
                        size_t size, loff_t *offp) { return 0; }
                    loff_t test_lseek(struct file *fp, loff_t off, int flag)
                        { return 0; }
                    int test_release(struct inode *ip, struct file *fp)
                        { return 0; }
    
                    const struct proc_ops test_ops __attribute__ ((unused)) = {
                            .proc_open      = test_open,
                            .proc_read      = test_read,
                            .proc_write     = test_write,
                            .proc_lseek     = test_lseek,
                            .proc_release   = test_release,
                    };
            ], [
                    struct proc_dir_entry *entry __attribute__ ((unused)) =
                        proc_create_data("test", 0444, NULL, &test_ops, NULL);
            ])
    ])
    
    AC_DEFUN([ZFS_AC_KERNEL_PROC_OPERATIONS], [
            AC_MSG_CHECKING([whether proc_ops structure exists])
            ZFS_LINUX_TEST_RESULT([proc_ops_struct], [
                    AC_MSG_RESULT(yes)
                    AC_DEFINE(HAVE_PROC_OPS_STRUCT, 1, [proc_ops structure exists])
            ], [
                    AC_MSG_RESULT(no)
            ])
    ])

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