linux-kernel - Re: [PATCH] vmw_vsock: bypass false-positive Wnonnull warning with gcc-16

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Message-Id: 
 <177025982907.136386.5748786579112411957.git-patchwork-notify@kernel.org>
Date: Thu, 05 Feb 2026 02:50:29 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Arnd Bergmann <arnd@...nel.org>
Cc: bryan-bt.tan@...adcom.com, vishnu.dasa@...adcom.com, sgarzare@...hat.com,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 arnd@...db.de, bcm-kernel-feedback-list@...adcom.com, horms@...nel.org,
 harshavardhana.sa@...adcom.com, bobbyeshleman@...a.com, mst@...hat.com,
 linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
 netdev@...r.kernel.org
Subject: Re: [PATCH] vmw_vsock: bypass false-positive Wnonnull warning with
 gcc-16

Hello:

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

On Tue,  3 Feb 2026 17:34:00 +0100 you wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The gcc-16.0.1 snapshot produces a false-positive warning that turns
> into a build failure with CONFIG_WERROR:
> 
> In file included from arch/x86/include/asm/string.h:6,
>                  from net/vmw_vsock/vmci_transport.c:10:
> In function 'vmci_transport_packet_init',
>     inlined from '__vmci_transport_send_control_pkt.constprop' at net/vmw_vsock/vmci_transport.c:198:2:
> arch/x86/include/asm/string_32.h:150:25: error: argument 2 null where non-null expected because argument 3 is nonzero [-Werror=nonnull]
>   150 | #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
>       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
> net/vmw_vsock/vmci_transport.c:164:17: note: in expansion of macro 'memcpy'
>   164 |                 memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait));
>       |                 ^~~~~~
> arch/x86/include/asm/string_32.h:150:25: note: in a call to built-in function '__builtin_memcpy'
> net/vmw_vsock/vmci_transport.c:164:17: note: in expansion of macro 'memcpy'
>   164 |                 memcpy(&pkt->u.wait, wait, sizeof(pkt->u.wait));
>       |                 ^~~~~~
> 
> [...]

Here is the summary with links:
  - vmw_vsock: bypass false-positive Wnonnull warning with gcc-16
    https://git.kernel.org/netdev/net-next/c/e25dbf561e03

You are awesome, thank you!
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