linux-kernel - Re: [PATCH v4 2/5] devcoredump: Add per device sysfs entry to enable/disable coredump

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Date:   Tue, 9 Aug 2022 19:27:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Manish Mandlik <mmandlik@...gle.com>
Cc:     Arend van Spriel <aspriel@...il.com>, marcel@...tmann.org,
        luiz.dentz@...il.com, chromeos-bluetooth-upstreaming@...omium.org,
        linux-bluetooth@...r.kernel.org,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Johannes Berg <johannes@...solutions.net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Won Chung <wonchung@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/5] devcoredump: Add per device sysfs entry to
 enable/disable coredump

On Tue, Aug 09, 2022 at 08:35:24AM -0700, Manish Mandlik wrote:
> The /sys/class/devcoredump/disabled provides only one-way disable
> functionality. Also, disabling devcoredump using it disables the
> devcoredump functionality for everyone who is using it.
> 
> Provide a way to selectively enable/disable devcoredump for the device
> which is bound to a driver that implements the '.coredump()' callback.
> 
> This adds the 'coredump_disabled' driver attribute. When the driver
> implements the '.coredump()' callback, 'coredump_disabled' file is added
> along with the 'coredump' file in the sysfs folder of the device upon
> driver binding. The file is removed when the driver is unbound.
> 
> Drivers can use this attribute to enable/disable devcoredump and the
> userspace can write 0 or 1 to /sys/devices/.../coredump_disabled sysfs
> entry to control enabling/disabling of devcoredump for that device.
> 
> Signed-off-by: Manish Mandlik <mmandlik@...gle.com>
> Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> ---
> 
> Changes in v4:
> - New patch in the series
> 
>  drivers/base/dd.c          | 43 +++++++++++++++++++++++++++++++++++---
>  drivers/base/devcoredump.c |  2 +-
>  include/linux/device.h     |  4 ++++
>  3 files changed, 45 insertions(+), 4 deletions(-)

You can't add a new sysfs file without also a Documentation/ABI update
at the same time :(

thanks,

greg k-h