linux-kernel - Re: [GIT PULL] x86 LTO changes for v3.15

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Message-ID: <CA+55aFyQHdtgQpnS7ar2db5QoZhmMStH_LgxHvAaCUbVEx_PQQ@mail.gmail.com>
Date:	Tue, 1 Apr 2014 17:35:05 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Gleb Natapov <gleb@...hat.com>, Peter Anvin <hpa@...or.com>,
	Jan Hubicka <hubicka@....cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [GIT PULL] x86 LTO changes for v3.15

On Tue, Apr 1, 2014 at 5:01 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> Why would they break tracing? I remember there was a issue with compat
> calls, are these related to that?

They "break" tracing by being invisible to syscall tracing. As you
really should know ;)

The syscall tracing feature depends on the wrappers that
SYSCALL_DEFINEx() creates. See the SYSCALL_TRACE_ENTER_EVENT() etc
crud in <linux/syscalls.h>

So there's no SYSCALL_METADATA for those system calls that weren't
created with the proper SYSCALL_DEFINE() wrappers.

                  Linus
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