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Date: Wed, 23 May 2018 14:03:02 +0200
From: Linus Walleij <>
To: Laura Abbott <>
Cc: Kees Cook <>, Lukas Wunner <>, 
	Rasmus Villemoes <>, Andy Shevchenko <>, 
	"open list:GPIO SUBSYSTEM" <>, 
	"" <>,, 
	Phil Reid <>, Geert Uytterhoeven <>
Subject: Re: [PATCHv9] gpio: Remove VLA from gpiolib

On Mon, May 21, 2018 at 7:57 PM, Laura Abbott <> wrote:

> The new challenge is to remove VLAs from the kernel
> (see to eventually
> turn on -Wvla.
> Using a kmalloc array is the easy way to fix this but kmalloc is still
> more expensive than stack allocation. Introduce a fast path with a
> fixed size stack array to cover most chip with gpios below some fixed
> amount. The slow path dynamically allocates an array to cover those
> chips with a large number of gpios.
> Reviewed-by: Geert Uytterhoeven <>
> Reviewed-by: Phil Reid <>
> Reviewed-and-tested-by: Lukas Wunner <>
> Signed-off-by: Lukas Wunner <>
> Signed-off-by: Laura Abbott <>
> ---
> v9: switch to bitmap_zero

This v9 applied with Andy's review tag on top and pushed to
the servers for testing!

THANKS A LOT for your tireless work on this, it looks really
really good now, and as it seems we cleaned up some other
code on the way.

Linus Walleij

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