linux-kernel - Re: [PATCH] kernel: add a kernel

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Message-Id: <20200721141838.12d19fce025c842138140324@linux-foundation.org>
Date:   Tue, 21 Jul 2020 14:18:38 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Christoph Hellwig <hch@....de>
Cc:     mcgrof@...nel.org, linux-kernel@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] kernel: add a kernel_wait helper

On Tue, 21 Jul 2020 15:04:49 +0200 Christoph Hellwig <hch@....de> wrote:

> Add a helper that waits for a pid and stores the status in the passed
> in kernel pointer.  Use it to fix the usage of kernel_wait4 in
> call_usermodehelper_exec_sync that only happens to work due to the
> implicit set_fs(KERNEL_DS) for kernel threads.

I guess it's cleaner, although it's a bit sad to be adding code to
address a non-problem.

Did you consider a simpler kernel_wait() which just wraps a
set_fs(KERNEL_DS) around a call to kernel_wait4()?