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Greg Kroah-Hartman ca9d081b49 zram: fix up permission for the hot_add sysfs file 
Commit 75a2d4226b ("driver core: class: mark the struct class for
sysfs callbacks as constant") changed the attribute to use
CLASS_ATTR_RO() which changed the permission from 0400 to 0444.  But
this atribute is "special" in that reading it modifies the system state,
so it MUST be set to 0400 so that only root processes can muck around
with it.

Fix this all up, AND document this so that I don't change it again in
3-4 years when I stumble across it and wonder why it's an open-coded
_ATTR() macro.

Reported-by: Denis Efremov <efremov@linux.com>
Fixes: 75a2d4226b ("driver core: class: mark the struct class for sysfs callbacks as constant")
Link: https://lore.kernel.org/r/2023041810-angelic-conical-52d8@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-04-18 16:06:22 +02:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.