From: Miroslav Benes <mbenes@suse.cz>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
Masami Hiramatsu <mhiramat@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Jiri Kosina <jikos@kernel.org>, Petr Mladek <pmladek@suse.com>,
Joe Lawrence <joe.lawrence@redhat.com>,
live-patching@vger.kernel.org
Subject: Re: [PATCH 06/11 v3] livepatch/ftrace: Add recursion protection to the ftrace callback
Date: Fri, 6 Nov 2020 11:05:17 +0100 (CET) [thread overview]
Message-ID: <alpine.LSU.2.21.2011061105030.10425@pobox.suse.cz> (raw)
In-Reply-To: <20201106023547.122802424@goodmis.org>
On Thu, 5 Nov 2020, Steven Rostedt wrote:
> From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
>
> If a ftrace callback does not supply its own recursion protection and
> does not set the RECURSION_SAFE flag in its ftrace_ops, then ftrace will
> make a helper trampoline to do so before calling the callback instead of
> just calling the callback directly.
>
> The default for ftrace_ops is going to change. It will expect that handlers
> provide their own recursion protection, unless its ftrace_ops states
> otherwise.
>
> Link: https://lkml.kernel.org/r/20201028115613.291169246@goodmis.org
>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Josh Poimboeuf <jpoimboe@redhat.com>
> Cc: Jiri Kosina <jikos@kernel.org>
> Cc: Miroslav Benes <mbenes@suse.cz>
> Cc: Joe Lawrence <joe.lawrence@redhat.com>
> Cc: live-patching@vger.kernel.org
> Reviewed-by: Petr Mladek <pmladek@suse.com>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Miroslav Benes <mbenes@suse.cz>
M
next prev parent reply other threads:[~2020-11-06 10:05 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-06 2:32 [PATCH 00/11 v3] ftrace: Have callbacks handle their own recursion Steven Rostedt
2020-11-06 2:32 ` [PATCH 01/11 v3] ftrace: Move the recursion testing into global headers Steven Rostedt
2020-11-06 2:32 ` [PATCH 02/11 v3] ftrace: Add ftrace_test_recursion_trylock() helper function Steven Rostedt
2020-11-06 2:32 ` [PATCH 03/11 v3] ftrace: Optimize testing what context current is in Steven Rostedt
2020-11-09 12:17 ` Peter Zijlstra
2020-11-09 16:51 ` Steven Rostedt
2020-11-06 2:32 ` [PATCH 04/11 v3] pstore/ftrace: Add recursion protection to the ftrace callback Steven Rostedt
2020-11-06 2:32 ` [PATCH 05/11 v3] kprobes/ftrace: " Steven Rostedt
2020-11-06 2:32 ` Steven Rostedt
2020-11-06 10:25 ` Masami Hiramatsu
2020-11-06 10:25 ` Masami Hiramatsu
2020-11-06 2:32 ` [PATCH 06/11 v3] livepatch/ftrace: " Steven Rostedt
2020-11-06 10:05 ` Miroslav Benes [this message]
2020-11-06 2:32 ` [PATCH 07/11 v3] livepatch: Trigger WARNING if livepatch function fails due to recursion Steven Rostedt
2020-11-06 10:07 ` Miroslav Benes
2020-11-06 2:32 ` [PATCH 08/11 v3] perf/ftrace: Add recursion protection to the ftrace callback Steven Rostedt
2020-11-06 2:32 ` [PATCH 09/11 v3] perf/ftrace: Check for rcu_is_watching() in callback function Steven Rostedt
2020-11-06 2:32 ` [PATCH 10/11 v3] ftrace: Reverse what the RECURSION flag means in the ftrace_ops Steven Rostedt
2020-11-06 2:32 ` [PATCH 11/11 v3] ftrace: Add recording of functions that caused recursion Steven Rostedt
2020-11-06 2:32 ` Steven Rostedt
2020-11-06 13:13 ` Petr Mladek
2020-11-06 13:13 ` Petr Mladek
2020-11-06 13:41 ` Steven Rostedt
2020-11-06 13:41 ` Steven Rostedt
2020-11-06 14:27 ` Petr Mladek
2020-11-06 14:27 ` Petr Mladek
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