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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=7JTqB5slGWNqmPcHQg0gX2jPDhSmZshqLrbRwDwrvQQ=; b=sPeETjA6kLATuY+2Gk+vaLSYwJSZzFAEKXOMD7TpcGZKGJXGHVMsNTQugBCm/ckhjN iYJCUDtXhGjNPQqIp9lMXhPH+LyTGjtTCJDQZ5Xs7HD6rgg5/e1vybBrKhX7ULF7C2X0 DIkuchWAYqp4a39EYmTv4GTxJf7YSxRlh7nij9r718wbpqwblRP+nIcRjiUPeUd6zeku y0A+ZwZaad5VES+J7gnHOJRluzQdlUwh7PUu4pxyZI2jtJh5v1T9hGeqkheeu9U2gguv Y1hEeM9Tr3SWcsqXp+5MxzwF2BKUUACC5Rru/cVmNwrLoHRBiY2JsePT7K/gJeNOyJLw cXIA== X-Gm-Message-State: AOAM532Wgd8davhfdNv9oCd10f1+feGdV9UzQ4QYhJMkcxW21kwKgeqh z9oblXHKC/pz0/PlWwW4dp+cyfsfW9UzKWKM8Y1K3g== X-Google-Smtp-Source: ABdhPJzlaBMxTWwrZe4YERy10lN7ECFDWF6Vu5QVaYVW+Htu2uWuMYN38XkknSqycX+o/PgPMS9zy6pkp2BhDOPkYdc= X-Received: by 2002:a17:906:eb93:: with SMTP id mh19mr9298900ejb.552.1595006904583; Fri, 17 Jul 2020 10:28:24 -0700 (PDT) MIME-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> <20200624203200.78870-5-samitolvanen@google.com> <20200624212737.GV4817@hirez.programming.kicks-ass.net> <20200624214530.GA120457@google.com> <20200625074530.GW4817@hirez.programming.kicks-ass.net> <20200625161503.GB173089@google.com> <20200625200235.GQ4781@hirez.programming.kicks-ass.net> <20200625224042.GA169781@google.com> <20200626112931.GF4817@hirez.programming.kicks-ass.net> In-Reply-To: <20200626112931.GF4817@hirez.programming.kicks-ass.net> From: Sami Tolvanen Date: Fri, 17 Jul 2020 10:28:13 -0700 Message-ID: Subject: Re: [RFC][PATCH] objtool,x86_64: Replace recordmcount with objtool To: Steven Rostedt , Peter Zijlstra X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200717_132828_593154_12F72D31 X-CRM114-Status: GOOD ( 15.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch , X86 ML , Kees Cook , "Paul E. McKenney" , Kernel Hardening , Greg Kroah-Hartman , Masahiro Yamada , linux-kbuild , Nick Desaulniers , LKML , clang-built-linux , Josh Poimboeuf , linux-pci@vger.kernel.org, Will Deacon , linux-arm-kernel , Matt Helsley Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jun 26, 2020 at 4:29 AM Peter Zijlstra wrote: > > On Thu, Jun 25, 2020 at 03:40:42PM -0700, Sami Tolvanen wrote: > > > > Not boot tested, but it generates the required sections and they look > > > more or less as expected, ymmv. > > > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > > > index a291823f3f26..189575c12434 100644 > > > --- a/arch/x86/Kconfig > > > +++ b/arch/x86/Kconfig > > > @@ -174,7 +174,6 @@ config X86 > > > select HAVE_EXIT_THREAD > > > select HAVE_FAST_GUP > > > select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE > > > - select HAVE_FTRACE_MCOUNT_RECORD > > > select HAVE_FUNCTION_GRAPH_TRACER > > > select HAVE_FUNCTION_TRACER > > > select HAVE_GCC_PLUGINS > > > > This breaks DYNAMIC_FTRACE according to kernel/trace/ftrace.c: > > > > #ifndef CONFIG_FTRACE_MCOUNT_RECORD > > # error Dynamic ftrace depends on MCOUNT_RECORD > > #endif > > > > And the build errors after that seem to confirm this. It looks like we might > > need another flag to skip recordmcount. > > Hurm, Steve, how you want to do that? Steven, did you have any thoughts about this? Moving recordmcount to an objtool pass that knows about call sites feels like a much cleaner solution than annotating kernel code to avoid unwanted relocations. Sami _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel