linux-kernel - [PATCH v2 0/1] livepatch: Add using attribute to klp

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Message-Id: <20240805064656.40017-1-zhangyongde.zyd@alibaba-inc.com>
Date: Mon,  5 Aug 2024 14:46:55 +0800
From: "zhangyongde.zyd" <zhangwarden@...il.com>
To: jpoimboe@...nel.org,
	mbenes@...e.cz,
	jikos@...nel.org,
	pmladek@...e.com,
	joe.lawrence@...hat.com
Cc: live-patching@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/1] livepatch: Add using attribute to klp_func for using function

This patch introduce one sysfs attribute of "using" to klp_func.
For example, if there are serval patches  make changes to function
"meminfo_proc_show", the attribute "enabled" of all the patch is 1.
With this attribute, we can easily know the version enabling belongs
to which patch.

Changes v1 => v2:
1. reset using type from bool to int
2. the value of "using" contains 3 types, 0(not used),
 1(using), -1(unknown). (As suggested by Petr).
3. add the process of transition state (-1 state). (suggested by Petr and Miroslav)

v1: https://lore.kernel.org/live-patching/1A0E6D0A-4245-4F44-8667-CDD86A925347@gmail.com/T/#t