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SubjectRe: [PATCH v2] [next] pcmcia: synclink_cs: replace 1-element array with flex-array member
On Wed, Dec 14, 2022 at 10:58 AM Paulo Miguel Almeida
<> wrote:
> One-element arrays are deprecated, and we are replacing them with
> flexible array members instead. So, replace one-element array with
> flexible-array member in struct RXBUF. No changes were required
> within the source code because of the existing padding in RXBUF struct

You shouldn't rely on padding. Make you change robust independently on
the padding. See also below.

> It's worth mentioning that doing a build before/after this patch
> results in no binary output differences.

This is interesting...

> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [1].
> Link:
> Link: [1]


The blank lines are not allowed in the tag block (in case you want to
have Link: to be recognized as a tag).

> Signed-off-by: Paulo Miguel Almeida <>
> ---
> Changelog:
> - v2: removed changes to how the size of RXBUF was calculated. I
> changed my mind after thinking about the existing padding in the
> struct. Happy to discuss it if anyone sees it differently.

I feel worried about in particular this code:

/* each buffer has header and data */
info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;

which means that entire rx_alloc_buffers() should be revisited. Also
take into account the use of one or more macros from overflow.h for
memory allocation.

With Best Regards,
Andy Shevchenko

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