How to tell whether a task_struct is running in kernelmode or usermode ?

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To: linux-newbie@xxxxxxxxxxxxxxx
Subject: How to tell whether a task_struct is running in kernelmode or usermode ?
From: William Tambe <tambewilliam@xxxxxxxxx>
Date: Sun, 29 Sep 2019 13:25:55 -0500

When a task execute a system-call, it runs in kernelmode and later
resume in usermode.

Which field of task_struct tells whether a task is currently running
kernelmode or usermode ?

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