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drm: vblank: remove drm_timestamp_monotonic parameter

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There is a risk of overflowing vblank timestamps in 2038 or 2106 if
someone sets the drm_timestamp_monotonic module parameter to zero.

I found no indication of anyone ever setting the parameter, or
complaining about the default being wrong, after it was introduced
as a way to handle backwards-compatibility with linux prior to
c61eef726a ("drm: add support for monotonic vblank timestamps"),
so it's probably safer to just remove the parameter completely
and only allowing the default behavior.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Arnd Bergmann
2017-10-11 17:20:13 +02:00
committed by Dave Airlie
parent 67680d3c04
commit 25e1a79874
3 changed files with 7 additions and 25 deletions
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1
drivers/gpu/drm/drm_internal.h
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@@ -55,7 +55,6 @@ int drm_clients_info(struct seq_file *m, void* data);
int drm_gem_name_info(struct seq_file *m, void *data);
/* drm_vblank.c */
extern unsigned int drm_timestamp_monotonic;
void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe);
void drm_vblank_cleanup(struct drm_device *dev);