[Intel-gfx] drivers/gpu/drm/i915/intel_pm.c:4467: bad comparison ?

[Jani Nikula]

On Mon, 17 Jul 2017, David Binderman <dcb314 at hotmail.com> wrote:
> Hello there,

Hello. No need to include LKML for stuff like this. But Cc'd the folks
from the broken commit.

> drivers/gpu/drm/i915/intel_pm.c:4467]: (warning) Comparison of a boolean expression with an integer other than 0 or 1.
>
> Source code is
>
>         else if ((ddb_allocation && ddb_allocation /
>             fixed_16_16_to_u32_round_up(plane_blocks_per_line)) >= 1)

Broken by

commit d555cb5827d603244969e08444340e3db78c8a37
Author: Kumar, Mahesh <mahesh1.kumar at intel.com>
Date:   Wed May 17 17:28:29 2017 +0530

    drm/i915/skl+: use linetime latency if ddb size is not available

The broken code has since been removed by bb9d85f6e9de ("drm/i915/skl:
New ddb allocation algorithm") but restored by 9a30a26122c3 ("Revert
"drm/i915/skl: New ddb allocation algorithm""). *sigh*.

Mahesh et al, please figure it out.


BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center