Re: [PATCH] firmware: cirrus: cs_dsp: Avoid padding bytes in cs_dsp_coeff_ctl

From: Mark Brown
Date: Mon Apr 25 2022 - 13:26:08 EST

On Mon, 25 Apr 2022 10:51:59 +0100, Richard Fitzgerald wrote:
> Change the order of members in struct cs_dsp_coeff_ctl to avoid
> the compiler having to insert alignment padding bytes. On a x86_64
> build this saves 16 bytes per control.
> - Pointers are collected to the top of the struct (with the exception of
> priv, as noted below), so that they are inherently aligned.
> - The set and enable bitflags are placed together so they can be merged.
> - priv is placed at the end of the struct - it is for use by the
> client so it is helpful to make it stand out, and since the compiler
> will always pad the struct size to an alignment multiple putting a
> pointer last won't introduce any more padding.
> - struct cs_dsp_alg_region is placed at the end, right before priv, for
> the same reasoning as priv.
> [...]

Applied to for-next


[1/1] firmware: cirrus: cs_dsp: Avoid padding bytes in cs_dsp_coeff_ctl
commit: 430c3500995484962bdbccf358201afef8055535

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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