[PATCH v3 09/24] wfx: add hwio.c/hwio.h
Kalle Valo
kvalo at codeaurora.org
Tue Dec 22 15:10:11 UTC 2020
Jerome Pouiller <Jerome.Pouiller at silabs.com> writes:
> +/*
> + * Internal helpers.
> + *
> + * About CONFIG_VMAP_STACK:
> + * When CONFIG_VMAP_STACK is enabled, it is not possible to run DMA on stack
> + * allocated data. Functions below that work with registers (aka functions
> + * ending with "32") automatically reallocate buffers with kmalloc. However,
> + * functions that work with arbitrary length buffers let's caller to handle
> + * memory location. In doubt, enable CONFIG_DEBUG_SG to detect badly located
> + * buffer.
> + */
This sounds very hacky to me, I have understood that you should never
use stack with DMA.
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