Subject: Re: [PATCH net] wifi: ath12k: fix build vs old compiler

From: [email-masked]
Date: Tue, 16 Jul 2024 15:00:32 +0000

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <[email-masked]>:

On Tue, 16 Jul 2024 13:06:39 +0200 you wrote:
> gcc 11.4.1-3 warns about memcpy() with overlapping pointers:
> 
> drivers/net/wireless/ath/ath12k/wow.c: In function ‘ath12k_wow_convert_8023_to_80211.constprop’:
> ./include/linux/fortify-string.h:114:33: error: ‘__builtin_memcpy’ accessing 18446744073709551611 or more bytes at offsets 0 and 0 overlaps 9223372036854775799 bytes at offset -9223372036854775804 [-Werror=restrict]
>   114 | #define __underlying_memcpy     __builtin_memcpy
>       |                                 ^
> ./include/linux/fortify-string.h:637:9: note: in expansion of macro ‘__underlying_memcpy’
>   637 |         __underlying_##op(p, q, __fortify_size);                        \
>       |         ^~~~~~~~~~~~~
> ./include/linux/fortify-string.h:682:26: note: in expansion of macro ‘__fortify_memcpy_chk’
>   682 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
>       |                          ^~~~~~~~~~~~~~~~~~~~
> drivers/net/wireless/ath/ath12k/wow.c:190:25: note: in expansion of macro ‘memcpy’
>   190 |                         memcpy(pat, eth_pat, eth_pat_len);
>       |                         ^~~~~~
> ./include/linux/fortify-string.h:114:33: error: ‘__builtin_memcpy’ accessing 18446744073709551605 or more bytes at offsets 0 and 0 overlaps 9223372036854775787 bytes at offset -9223372036854775798 [-Werror=restrict]
>   114 | #define __underlying_memcpy     __builtin_memcpy
>       |                                 ^
> ./include/linux/fortify-string.h:637:9: note: in expansion of macro ‘__underlying_memcpy’
>   637 |         __underlying_##op(p, q, __fortify_size);                        \
>       |         ^~~~~~~~~~~~~
> ./include/linux/fortify-string.h:682:26: note: in expansion of macro ‘__fortify_memcpy_chk’
>   682 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
>       |                          ^~~~~~~~~~~~~~~~~~~~
> drivers/net/wireless/ath/ath12k/wow.c:232:25: note: in expansion of macro ‘memcpy’
>   232 |                         memcpy(pat, eth_pat, eth_pat_len);
>       |                         ^~~~~~
> 
> [...]

Here is the summary with links:
  - [net] wifi: ath12k: fix build vs old compiler
    https://git.kernel.org/netdev/net-next/c/b49991d83bba

You are awesome, thank you!
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