Re: [PATCH] wireless: ath: work around false-positive stringop-overread warning

[Simon Horman]

On Mon, Apr 17, 2023 at 10:54:20PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
> 
> In a rare arm64 randconfig build, I got multiple warnings for ath11k
> and ath12k:
> 
> In function 'ath11k_peer_assoc_h_ht',
>     inlined from 'ath11k_peer_assoc_prepare' at drivers/net/wireless/ath/ath11k/mac.c:2665:2:
> drivers/net/wireless/ath/ath11k/mac.c:1709:13: error: 'ath11k_peer_assoc_h_ht_masked' reading 10 bytes from a region of size 0 [-Werror=stringop-overread]
>  1709 |         if (ath11k_peer_assoc_h_ht_masked(ht_mcs_mask))
>       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> This happens whenever gcc-13 fails to inline one of the functions
> that take a fixed-length array argument but gets passed a pointer.
> 
> Change these functions to all take a regular pointer argument
> instead.
> 
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>

Note: I was not able to reproduce the problem described above.