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

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Message-ID: <3164e897-a423-3948-d50a-f2bdd4ad05e9@sony.com>
Date:   Mon, 24 Apr 2023 15:17:09 +0200
From:   Peter Enderborg <Peter.Enderborg@...y.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Brown <broonie@...nel.org>
Cc:     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 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.


> thanks,
>
> greg k-h