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Subject: Re: [PATCH bpf-next] bpf: avoid gcc overflow warning in test_xdp_vlan.c
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <171555963167.28854.5804115900768160470.git-patchwork-notify@kernel.org>
Date: Mon, 13 May 2024 00:20:31 +0000
References: <20240508193512.152759-1-david.faust@oracle.com>
In-Reply-To: <20240508193512.152759-1-david.faust@oracle.com>
To: David Faust <david.faust@oracle.com>
Cc: bpf@vger.kernel.org, jose.marchesi@oracle.com,
 cupertino.miranda@oracle.com, eddyz87@gmail.com, yonghong.song@linux.dev

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Wed,  8 May 2024 12:35:12 -0700 you wrote:
> This patch fixes an integer overflow warning raised by GCC in
> xdp_prognum1 of progs/test_xdp_vlan.c:
> 
>   GCC-BPF  [test_maps] test_xdp_vlan.bpf.o
> progs/test_xdp_vlan.c: In function 'xdp_prognum1':
> progs/test_xdp_vlan.c:163:25: error: integer overflow in expression
>  '(short int)(((__builtin_constant_p((int)vlan_hdr->h_vlan_TCI)) != 0
>    ? (int)(short unsigned int)((short int)((int)vlan_hdr->h_vlan_TCI
>    << 8 >> 8) << 8 | (short int)((int)vlan_hdr->h_vlan_TCI << 0 >> 8
>    << 0)) & 61440 : (int)__builtin_bswap16(vlan_hdr->h_vlan_TCI)
>    & 61440) << 8 >> 8) << 8' of type 'short int' results in '0' [-Werror=overflow]
>   163 |                         bpf_htons((bpf_ntohs(vlan_hdr->h_vlan_TCI) & 0xf000)
>       |                         ^~~~~~~~~
> 
> [...]

Here is the summary with links:
  - [bpf-next] bpf: avoid gcc overflow warning in test_xdp_vlan.c
    https://git.kernel.org/bpf/bpf-next/c/792a04bed41c

You are awesome, thank you!
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