WTF: patch "[PATCH] drm/mgag200: Remove declaration of mgag200_mmap() from header" was seriously submitted to be applied to the 5.8-stable tree?

The patch below was submitted to be applied to the 5.8-stable tree.

I fail to see how this patch meets the stable kernel rules as found at Documentation/process/stable-kernel-rules.rst.

I could be totally wrong, and if so, please respond to <[email protected]> and let me know why this patch should be applied. Otherwise, it is now dropped from my patch queues, never to be seen again.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 1d8d42ba365101fa68d210c0e2ed2bc9582fda6c Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <[email protected]>
Date: Fri, 5 Jun 2020 15:57:50 +0200
Subject: [PATCH] drm/mgag200: Remove declaration of mgag200_mmap() from header
file
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Commit 94668ac796a5 ("drm/mgag200: Convert mgag200 driver to VRAM MM") removed the implementation of mgag200_mmap(). Also remove the declaration.

index 47df62b1ad29..92b6679029fe 100644
@@ -198,6 +198,5 @@ void mgag200_i2c_destroy(struct mga_i2c_chan *i2c);
 
 int mgag200_mm_init(struct mga_device *mdev);
 void mgag200_mm_fini(struct mga_device *mdev);
-int mgag200_mmap(struct file *filp, struct vm_area_struct *vma);
 
 #endif				/* __MGAG200_DRV_H__ */