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Just like for 'panic_print's systcl interface, add similar note for setup of kernel cmdline parameter and parameter under /sys/module/kernel/. Also add __core_param_cb() macro, which enables to add special get/set operation for a kernel parameter. Link: https://lkml.kernel.org/r/20250825025701.81921-4-feng.tang@linux.alibaba.com Signed-off-by: Feng Tang <feng.tang@linux.alibaba.com> Suggested-by: Petr Mladek <pmladek@suse.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Cc: Askar Safin <safinaskar@zohomail.com> Cc: John Ogness <john.ogness@linutronix.de> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Lance Yang <lance.yang@linux.dev> Cc: "Paul E . McKenney" <paulmck@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>