From mboxrd@z Thu Jan 1 00:00:00 1970 From: Will Deacon Subject: Re: [for-next][PATCH 04/18] arm64: function_graph: Simplify with function_graph_entry() Date: Tue, 27 Nov 2018 18:07:23 +0000 Message-ID: <20181127180722.GB19216@arm.com> References: <20181122002801.501220343@goodmis.org> <20181122003331.917870132@goodmis.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20181122003331.917870132@goodmis.org> Sender: linux-kernel-owner@vger.kernel.org To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Linus Torvalds , Ingo Molnar , Andrew Morton , Thomas Gleixner , Peter Zijlstra , linux-arch@vger.kernel.org, Joel Fernandes , Masami Hiramatsu , Josh Poimboeuf , Andy Lutomirski , Frederic Weisbecker , Catalin Marinas , linux-arm-kernel@lists.infradead.org, stable@kernel.org List-Id: linux-arch.vger.kernel.org On Wed, Nov 21, 2018 at 07:28:05PM -0500, Steven Rostedt wrote: > From: "Steven Rostedt (VMware)" > > The function_graph_entry() function does the work of calling the function > graph hook function and the management of the shadow stack, simplifying the > work done in the architecture dependent prepare_ftrace_return(). > > Have arm64 use the new code, and remove the shadow stack management as well as > having to set up the trace structure. > > This is needed to prepare for a fix of a design bug on how the curr_ret_stack > is used. > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: linux-arm-kernel@lists.infradead.org > Cc: stable@kernel.org > Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback") > Signed-off-by: Steven Rostedt (VMware) > --- > arch/arm64/kernel/ftrace.c | 15 +-------------- > 1 file changed, 1 insertion(+), 14 deletions(-) Minor nit: the subject refers to function_graph_entry(), but looks like you settled on function_graph_enter() in the end. Anyway, looks like no change for us, so: Acked-by: Will Deacon Will From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:44586 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725883AbeK1FFs (ORCPT ); Wed, 28 Nov 2018 00:05:48 -0500 Date: Tue, 27 Nov 2018 18:07:23 +0000 From: Will Deacon Subject: Re: [for-next][PATCH 04/18] arm64: function_graph: Simplify with function_graph_entry() Message-ID: <20181127180722.GB19216@arm.com> References: <20181122002801.501220343@goodmis.org> <20181122003331.917870132@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181122003331.917870132@goodmis.org> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Linus Torvalds , Ingo Molnar , Andrew Morton , Thomas Gleixner , Peter Zijlstra , linux-arch@vger.kernel.org, Joel Fernandes , Masami Hiramatsu , Josh Poimboeuf , Andy Lutomirski , Frederic Weisbecker , Catalin Marinas , linux-arm-kernel@lists.infradead.org, stable@kernel.org Message-ID: <20181127180723.thT2viM0fEqwkASXhLviVfV2g0AhbtrG5ktk3-w2_58@z> On Wed, Nov 21, 2018 at 07:28:05PM -0500, Steven Rostedt wrote: > From: "Steven Rostedt (VMware)" > > The function_graph_entry() function does the work of calling the function > graph hook function and the management of the shadow stack, simplifying the > work done in the architecture dependent prepare_ftrace_return(). > > Have arm64 use the new code, and remove the shadow stack management as well as > having to set up the trace structure. > > This is needed to prepare for a fix of a design bug on how the curr_ret_stack > is used. > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: linux-arm-kernel@lists.infradead.org > Cc: stable@kernel.org > Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback") > Signed-off-by: Steven Rostedt (VMware) > --- > arch/arm64/kernel/ftrace.c | 15 +-------------- > 1 file changed, 1 insertion(+), 14 deletions(-) Minor nit: the subject refers to function_graph_entry(), but looks like you settled on function_graph_enter() in the end. Anyway, looks like no change for us, so: Acked-by: Will Deacon Will