Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20190428133826.3e142cfd@oasis.local.home> <CALCETrXvmZPHsfRVnW0AtyddfN-2zaCmWn+FsrF6XPTOFd_Jmw@mail.gmail.com>
 <CAHk-=whtt4K2f0KPtG-4Pykh3FK8UBOjD8jhXCUKB5nWDj_YRA@mail.gmail.com>
 <CALCETrWELBCK-kqX5FCEDVUy8kCT-yVu7m_7Dtn=GCsHY0Du5A@mail.gmail.com>
 <CAHk-=wgewK4eFhF3=0RNtk1KQjMANFH6oDE=8m=84RExn2gxhw@mail.gmail.com>
 <CAHk-=whay7eN6+2gZjY-ybRbkbcqAmgrLwwszzHx8ws3c=S-MA@mail.gmail.com>
 <CALCETrXzVU0Q7u1q=QFPaDr=aojjF5cjbOi9CxxXnp5GqTqsWA@mail.gmail.com>
 <CAHk-=wg1QPz0m+7jnVcjQgkySUQLzAXE8_PZARV-vWYK27LB=w@mail.gmail.com>
 <20190430135602.GD2589@hirez.programming.kicks-ass.net> <CAHk-=wg7vUGMRHyBsLig6qiPK0i4_BK3bRrTN+HHHziUGg1P_A@mail.gmail.com>
 <CALCETrXujRWxwkgAwB+8xja3N9H22t52AYBYM_mbrjKKZ624Eg@mail.gmail.com>
 <20190430130359.330e895b@gandalf.local.home> <20190430132024.0f03f5b8@gandalf.local.home>
 <20190430134913.4e29ce72@gandalf.local.home> <20190430175334.423821c0@gandalf.local.home>
 <20190430213517.7bcfaf8e@oasis.local.home>
In-Reply-To: <20190430213517.7bcfaf8e@oasis.local.home>
From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue, 30 Apr 2019 18:58:08 -0700
Message-ID: <CAHk-=whpS92oz-FkzaVdTEXVMre1NQioiLfqyEYYkmrVoVvgzw@mail.gmail.com>
Subject: Re: [RFC][PATCH v2] ftrace/x86: Emulate call function while updating
 in breakpoint handler
To:     Steven Rostedt <rostedt@goodmis.org>
Cc:     Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Nicolai Stange <nstange@suse.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Jiri Kosina <jikos@kernel.org>,
        Miroslav Benes <mbenes@suse.cz>,
        Petr Mladek <pmladek@suse.com>,
        Joe Lawrence <joe.lawrence@redhat.com>,
        Shuah Khan <shuah@kernel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Mimi Zohar <zohar@linux.ibm.com>,
        Juergen Gross <jgross@suse.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nayna Jain <nayna@linux.ibm.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Joerg Roedel <jroedel@suse.de>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        live-patching@vger.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Tue, Apr 30, 2019 at 6:35 PM Steven Rostedt <rostedt@goodmis.org> wrote:
>
>
> Probably easier to move it from inline asm to ftrace_X.S and use the
> lockdep TRACE_ON/OFF macros.

Yeah, that should clean up the percpu stuff too since we have helper
macros for it for *.S files anyway.

I only did the asm() in C because it made the "look, something like
this" patch simpler to test (and it made it easy to check the
generated asm file). Not because it was a good idea ;)

                 Linus