Re: [PATCH] net/mlx4_core: Avoid impossible mlx4_db_alloc() order value

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 10 Feb 2025 09:45:05 -0800 you wrote:
> GCC can see that the value range for "order" is capped, but this leads
> it to consider that it might be negative, leading to a false positive
> warning (with GCC 15 with -Warray-bounds -fdiagnostics-details):
> 
> ../drivers/net/ethernet/mellanox/mlx4/alloc.c:691:47: error: array subscript -1 is below array bounds of 'long unsigned int *[2]' [-Werror=array-bounds=]
>   691 |                 i = find_first_bit(pgdir->bits[o], MLX4_DB_PER_PAGE >> o);
>       |                                    ~~~~~~~~~~~^~~
>   'mlx4_alloc_db_from_pgdir': events 1-2
>   691 |                 i = find_first_bit(pgdir->bits[o], MLX4_DB_PER_PAGE >> o);                        |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>       |                     |                         |                                                   |                     |                         (2) out of array bounds here
>       |                     (1) when the condition is evaluated to true                             In file included from ../drivers/net/ethernet/mellanox/mlx4/mlx4.h:53,
>                  from ../drivers/net/ethernet/mellanox/mlx4/alloc.c:42:
> ../include/linux/mlx4/device.h:664:33: note: while referencing 'bits'
>   664 |         unsigned long          *bits[2];
>       |                                 ^~~~
> 
> [...]

Here is the summary with links:
  - net/mlx4_core: Avoid impossible mlx4_db_alloc() order value
    https://git.kernel.org/netdev/net-next/c/4a6f18f28627

You are awesome, thank you!
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