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SubjectRe: [RFC PATCH] drm: disable WC optimization for cache coherent devices on non-x86
> +#include <linux/dma-noncoherent.h>

This header is not for usage in device drivers, but purely for
dma-mapping implementations!

> +static inline bool drm_device_can_wc_memory(struct drm_device *ddev)
> {
> + if (IS_ENABLED(CONFIG_PPC))
> + return IS_ENABLED(CONFIG_NOT_COHERENT_CACHE);
> + else if (IS_ENABLED(CONFIG_MIPS))
> + return !IS_ENABLED(CONFIG_CPU_LOONGSON3);
> + else if (IS_ENABLED(CONFIG_X86))
> + return true;
> +
> + return !dev_is_dma_coherent(ddev->dev);

And even if something like this was valid to do, it would have to be
a core function with an arch hook, and not hidden in a random driver.

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