linux-kernel - Re: [PATCH] spi: remove return value check of debugfs_create

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Message-ID: <2023042431-crook-stable-5749@gregkh>
Date:   Mon, 24 Apr 2023 15:22:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Peter Enderborg <Peter.Enderborg@...y.com>
Cc:     Mark Brown <broonie@...nel.org>, Yingsha Xu <ysxu@...t.edu.cn>,
        Serge Semin <fancer.lancer@...il.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: remove return value check of debugfs_create_dir()

On Mon, Apr 24, 2023 at 03:17:09PM +0200, Peter Enderborg wrote:
> On 4/24/23 14:53, Greg Kroah-Hartman wrote:
> >
> >>> We can do things with the debug information without filesystem enabled.
> > What exactly do you mean by this?
> >
> >
> We can read out data from kernel with a ramdumper and analyse with crash.
> 
> See https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/kernel_administration_guide/kernel_crash_dump_guide
> 
> If it is useful or not I can not say, but the dws->regset. is lost and can not be read with a post mortem debugger.

What is "dws"?  What is "regset"?

What is the root problem here?

confused,

greg k-h