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Date:   Tue, 10 Mar 2020 04:28:14 +0000
From:   Ganapathi Bhat <>
To:     "Gustavo A. R. Silva" <>,
        Kalle Valo <>,
        "David S. Miller" <>,
        Amitkumar Karwar <>,
        Xinming Hu <>,
        Lennert Buytenhek <>
CC:     "" <>,
        "" <>,
        "" <>
Subject: RE: [EXT] [PATCH][next] wireless: marvell: Replace zero-length array
 with flexible-array member

Hi Gustavo,

> The current codebase makes use of the zero-length array language extension
> to the C90 standard, but the preferred mechanism to declare variable-length
> types such as these ones is a flexible array member[1][2], introduced in C99:
> struct foo {
>         int stuff;
>         struct boo array[];
> };
> By making use of the mechanism above, we will get a compiler warning in
> case the flexible array does not occur last in the structure, which will help us
> prevent some kind of undefined behavior bugs from being inadvertently
> introduced[3] to the codebase from now on.
> Also, notice that, dynamic memory allocations won't be affected by this
> change:
> "Flexible array members have incomplete type, and so the sizeof operator
> may not be applied. As a quirk of the original implementation of zero-length
> arrays, sizeof evaluates to zero."[1]

Thanks for this path.

Acked-by: Ganapathi Bhat <>

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