From: Miroslav Benes <mbenes@suse.cz>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Vince Weaver <vincent.weaver@maine.edu>, Dave Jones <dsj@fb.com>,
Jann Horn <jannh@google.com>, Andy Lutomirski <luto@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 10/14] x86/unwind/orc: Prevent unwinding before ORC initialization
Date: Fri, 13 Mar 2020 13:24:09 +0100 (CET) [thread overview]
Message-ID: <alpine.LSU.2.21.2003131321340.30076@pobox.suse.cz> (raw)
In-Reply-To: <5b3e0cbab4a5e6cf5e3cab87f18f2ae582ec01d7.1584033751.git.jpoimboe@redhat.com>
On Thu, 12 Mar 2020, Josh Poimboeuf wrote:
> If the unwinder is called before the ORC data has been initialized,
> orc_find() returns NULL, and it tries to fall back to using frame
> pointers. This can cause some unexpected warnings during boot.
>
> Move the 'orc_init' check from orc_find() to __unwind_init(), so that it
s/__unwind_init()/__unwind_start()/
> void __unwind_start(struct unwind_state *state, struct task_struct *task,
> struct pt_regs *regs, unsigned long *first_frame)
> {
> + if (!orc_init)
> + goto done;
> +
> memset(state, 0, sizeof(*state));
> state->task = task;
Miroslav
next prev parent reply other threads:[~2020-03-13 12:24 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 17:30 [PATCH 00/14] x86/unwind/orc: ORC fixes Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 01/14] x86/dumpstack: Add SHOW_REGS_IRET mode Josh Poimboeuf
2020-03-13 11:10 ` Miroslav Benes
2020-03-12 17:30 ` [PATCH 02/14] objtool: Fix stack offset tracking for indirect CFAs Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 03/14] x86/entry/64: Fix unwind hints in register clearing code Josh Poimboeuf
2020-03-12 19:29 ` Andy Lutomirski
2020-03-12 19:57 ` Josh Poimboeuf
2020-03-12 20:07 ` Peter Zijlstra
2020-03-12 21:24 ` Jann Horn
2020-03-12 17:30 ` [PATCH 04/14] x86/entry/64: Fix unwind hints in kernel exit path Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 05/14] x86/entry/64: Fix unwind hints in __switch_to_asm() Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 06/14] x86/entry/64: Fix unwind hints in rewind_stack_do_exit() Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 07/14] x86/unwind/orc: Convert global variables to static Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 08/14] x86/unwind: Prevent false warnings for non-current tasks Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 09/14] x86/unwind/orc: Don't skip the first frame for inactive tasks Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 10/14] x86/unwind/orc: Prevent unwinding before ORC initialization Josh Poimboeuf
2020-03-13 12:24 ` Miroslav Benes [this message]
2020-03-12 17:30 ` [PATCH 11/14] x86/unwind/orc: Fix error path for bad ORC entry type Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 12/14] x86/unwind/orc: Fix premature unwind stoppage due to IRET frames Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 13/14] x86/unwind/orc: Add more unwinder warnings Josh Poimboeuf
2020-03-12 19:12 ` Jann Horn
2020-03-12 19:20 ` Josh Poimboeuf
2020-03-12 17:30 ` [PATCH 14/14] x86/unwind/orc: Add 'unwind_debug' cmdline option Josh Poimboeuf
2020-03-12 19:15 ` [PATCH 00/14] x86/unwind/orc: ORC fixes Peter Zijlstra
2020-03-13 14:00 ` Miroslav Benes
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