clean up kernel_{read,write} & friends v2

[Joe Perches]

On Thu, 2020-05-28 at 12:44 -0700, Matthew Wilcox wrote:
> On Thu, May 28, 2020 at 08:33:40PM +0100, Al Viro wrote:
> > On Thu, May 28, 2020 at 12:22:08PM -0700, Joe Perches wrote:
> > 
> > > Hard limits at 80 really don't work well, especially with
> > > some of the 25+ character length identifiers used today.
> > 
> > IMO any such identifier is a good reason for a warning.
> > 
> > The litmus test is actually very simple: how unpleasant would it be
> > to mention the identifiers while discussing the code over the phone?
> 
> Here's a good example of a function which should be taken out and shot:
> 
> int amdgpu_atombios_get_leakage_vddc_based_on_leakage_params(struct amdgpu_devic
> e *adev,

Ick.

Seems simple enough as it doesn't appear to be used...

$ git grep amdgpu_atombios_get_leakage_vddc_based_on_leakage_params
drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c:int amdgpu_atombios_get_leakage_vddc_based_on_leakage_params(struct amdgpu_device *adev,
drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.h:int amdgpu_atombios_get_leakage_vddc_based_on_leakage_params(struct amdgpu_device *adev,