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

[<gregkh@linuxfoundation.org>]

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 
<stable@vger.kernel.org> 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 <tzimmermann@suse.de>
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.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Fixes: 94668ac796a5 ("drm/mgag200: Convert mgag200 driver to VRAM MM")
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "Noralf Trønnes" <noralf@tronnes.org>
Cc: Armijn Hemel <armijn@tjaldur.nl>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Emil Velikov <emil.velikov@collabora.com>
Cc: <stable@vger.kernel.org> # v5.3+
Link: https://patchwork.freedesktop.org/patch/msgid/20200605135803.19811-2-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
index 47df62b1ad29..92b6679029fe 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -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__ */