linux-kernel - Re: [PATCH] selftests/ipc: skip msgque test if MSG

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Message-ID: <264104b5-ac21-415b-9021-76d4d9b79a55@kernel.org>
Date: Tue, 20 Jan 2026 17:03:58 -0700
From: Shuah <shuah@...nel.org>
To: UYeol Jo <jouyeol8739@...il.com>, Shuah Khan <shuah@...nel.org>
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
 richard.weiyang@...il.com, akpm@...ux-foundation.org, sef1548@...il.com
Subject: Re: [PATCH] selftests/ipc: skip msgque test if MSG_COPY is not
 supported

On 1/19/26 04:21, UYeol Jo wrote:
> The msgque test uses the MSG_COPY flag, which depends on
> CONFIG_CHECKPOINT_RESTORE. On kernels where this option is disabled,
> msgrcv() fails with ENOSYS.
> 
> Currently, the test reports this as a failure:
> 
> Change it to skip the test instead, as the failure is due to missing
> kernel configuration rather than a bug in the IPC subsystem.
>   # selftests: ipc: msgque
>   # not ok 1 Failed to copy IPC message: Function not implemented (38)
>   # not ok 2 Failed to dump queue: -38
> 
> After this patch, the test reports a skip instead of failure:
> 1..0 # SKIP MSG_COPY not supported

Did you happen to test this with CONFIG_CHECKPOINT_RESTORE
enabled and without?

MSG_COPY is not specific to CONFIG_CHECKPOINT_RESTORE - I see
MSG_COPY flag handling on non-CONFIG_CHECKPOINT_RESTORE code
in ipc/msg.c.

thanks,
-- Shuah