linux-kernel - Re: [PATCH] Documentation: coding-style: don't encourage WARN*()

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Date: Mon, 15 Apr 2024 10:35:21 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Christoph Hellwig <hch@...radead.org>
Cc: Alex Elder <elder@...aro.org>, corbet@....net,
	workflows@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation: coding-style: don't encourage WARN*()

On Mon, Apr 15, 2024 at 01:07:41AM -0700, Christoph Hellwig wrote:
> No, this advice is wronger than wrong.  If you set panic_on_warn you
> get to keep the pieces.  
> 

But don't add new WARN() calls please, just properly clean up and handle
the error.  And any WARN() that userspace can trigger ends up triggering
syzbot reports which also is a major pain, even if you don't have
panic_on_warn enabled.

And I think the "do not use panic_on_warn" recommendation has been
ignored, given the huge use of it by vendors who have enabled it (i.e.
all Samsung phones and cloud servers).

thanks,

greg k-h