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From: Steven Rostedt <rostedt@goodmis.org>
To: Miroslav Benes <mbenes@suse.cz>
Cc: mingo@redhat.com, jpoimboe@redhat.com, jikos@kernel.org,
	pmladek@suse.com, joe.lawrence@redhat.com,
	linux-kernel@vger.kernel.org, live-patching@vger.kernel.org,
	shuah@kernel.org, kamalesh@linux.vnet.ibm.com,
	linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v3 0/3] ftrace: Introduce PERMANENT ftrace_ops flag
Date: Wed, 16 Oct 2019 10:58:14 -0400	[thread overview]
Message-ID: <20191016105814.2061a106@gandalf.local.home> (raw)
In-Reply-To: <20191016113316.13415-1-mbenes@suse.cz>

On Wed, 16 Oct 2019 13:33:12 +0200
Miroslav Benes <mbenes@suse.cz> wrote:

> Livepatch uses ftrace for redirection to new patched functions. It means
> that if ftrace is disabled, all live patched functions are disabled as
> well. Toggling global 'ftrace_enabled' sysctl thus affect it directly.
> It is not a problem per se, because only administrator can set sysctl
> values, but it still may be surprising.
> 
> Introduce PERMANENT ftrace_ops flag to amend this. If the
> FTRACE_OPS_FL_PERMANENT is set on any ftrace ops, the tracing cannot be
> disabled by disabling ftrace_enabled. Equally, a callback with the flag
> set cannot be registered if ftrace_enabled is disabled.
> 
> v2->v3:
> - ftrace_enabled explicitly set to true
> - selftest from Joe Lawrence (I just split it to two patches)
> - typo fix
> 
> v1->v2:
> - different logic, proposed by Joe Lawrence
> 
> Joe Lawrence (2):
>   selftests/livepatch: Make dynamic debug setup and restore generic
>   selftests/livepatch: Test interaction with ftrace_enabled
> 
> Miroslav Benes (1):
>   ftrace: Introduce PERMANENT ftrace_ops flag
> 

Would you like me to take all three patches through my tree?

-- Steve

  parent reply	other threads:[~2019-10-16 14:58 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-16 11:33 Miroslav Benes
2019-10-16 11:33 ` [PATCH v3 1/3] " Miroslav Benes
2019-10-16 13:48   ` Steven Rostedt
2019-10-16 14:25     ` Steven Rostedt
2019-10-16 11:33 ` [PATCH v3 2/3] selftests/livepatch: Make dynamic debug setup and restore generic Miroslav Benes
2019-10-16 15:08   ` Petr Mladek
2019-10-16 17:10   ` Kamalesh Babulal
2019-10-16 21:39     ` Joe Lawrence
2019-10-16 11:33 ` [PATCH v3 3/3] selftests/livepatch: Test interaction with ftrace_enabled Miroslav Benes
2019-10-16 15:07   ` Petr Mladek
2019-10-16 17:06   ` Kamalesh Babulal
2019-10-16 21:47     ` Joe Lawrence
2019-10-17  7:25       ` Kamalesh Babulal
2019-10-16 14:58 ` Steven Rostedt [this message]
2019-10-16 15:01   ` [PATCH v3 0/3] ftrace: Introduce PERMANENT ftrace_ops flag Miroslav Benes

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