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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id z125sm28300985wme.37.2019.10.07.05.55.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Oct 2019 05:55:21 -0700 (PDT) Date: Mon, 7 Oct 2019 14:55:19 +0200 From: Ingo Molnar To: Peter Zijlstra Cc: x86@kernel.org, linux-kernel@vger.kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, bristot@redhat.com, jbaron@akamai.com, torvalds@linux-foundation.org, tglx@linutronix.de, namit@vmware.com, hpa@zytor.com, luto@kernel.org, ard.biesheuvel@linaro.org, jpoimboe@redhat.com, hjl.tools@gmail.com Subject: Re: [RFC][PATCH 0/9] Variable size jump_label support Message-ID: <20191007125519.GA56546@gmail.com> References: <20191007090225.44108711.6@infradead.org> <20191007084443.79370128.1@infradead.org> <20191007120756.GE2311@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191007120756.GE2311@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Peter Zijlstra wrote: > IIRC the recordmcount variant from Steve was also rewriting JMP8 to NOP2 > at build time. > > I dug this here link out of my IRC logs: > > https://lore.kernel.org/lkml/1318007374.4729.58.camel@gandalf.stny.rr.com/ Ancient indeed ... > Looking at that, part of the reason might've been running yet another > tool, instead of having one tool do everything. Yeah - that too wouldn't be a problem with objtool, as we are running it anyway, right? So I can see about 2 valid technical reasons why Linus would have objected to that old approach from Steve while finding the objtool approach more acceptable. Basically the main assumption is that we better never run out of competent objtool experts... :-) Thanks, Ingo