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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id t24sm11012562qtc.97.2019.11.18.09.11.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 18 Nov 2019 09:11:29 -0800 (PST) Message-ID: <1574097087.5937.141.camel@lca.pw> Subject: Re: powerpc ftrace broken due to "manual merge of the ftrace tree with the arm64 tree" From: Qian Cai To: Steven Rostedt Date: Mon, 18 Nov 2019 12:11:27 -0500 In-Reply-To: <20191118101645.2f68c521@oasis.local.home> References: <1573849732.5937.136.camel@lca.pw> <20191115160230.78871d8f@gandalf.local.home> <1573851994.5937.138.camel@lca.pw> <20191118095104.0daebbc3@oasis.local.home> <20191118095842.546b38d8@oasis.local.home> <20191118101645.2f68c521@oasis.local.home> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.6 (3.22.6-10.el7) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Stephen Rothwell , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, 2019-11-18 at 10:16 -0500, Steven Rostedt wrote: > On Mon, 18 Nov 2019 09:58:42 -0500 > Steven Rostedt wrote: > > > On Mon, 18 Nov 2019 09:51:04 -0500 > > Steven Rostedt wrote: > > > > > > > Test this commit please: b83b43ffc6e4b514ca034a0fbdee01322e2f7022 > > > > > > > > # git reset --hard b83b43ffc6e4b514ca034a0fbdee01322e2f7022 > > > > > > > > Yes, that one is bad. > > > > > > Can you see if this patch fixes the issue for you? > > > > Don't bother. This isn't the right fix, I know see the real issue. > > > > New fix coming shortly. > > > > Can you try this? Yes, it works fine. > > It appears that I picked a name "ftrace_graph_stub", that was already in > use by powerpc. This just renames the function stub I used. > > -- Steve > > diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h > index 0f358be551cd..996db32c491b 100644 > --- a/include/asm-generic/vmlinux.lds.h > +++ b/include/asm-generic/vmlinux.lds.h > @@ -112,7 +112,7 @@ > #ifdef CONFIG_FTRACE_MCOUNT_RECORD > #ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY > /* > - * Need to also make ftrace_graph_stub point to ftrace_stub > + * Need to also make ftrace_stub_graph point to ftrace_stub > * so that the same stub location may have different protocols > * and not mess up with C verifiers. > */ > @@ -120,17 +120,17 @@ > __start_mcount_loc = .; \ > KEEP(*(__patchable_function_entries)) \ > __stop_mcount_loc = .; \ > - ftrace_graph_stub = ftrace_stub; > + ftrace_stub_graph = ftrace_stub; > #else > #define MCOUNT_REC() . = ALIGN(8); \ > __start_mcount_loc = .; \ > KEEP(*(__mcount_loc)) \ > __stop_mcount_loc = .; \ > - ftrace_graph_stub = ftrace_stub; > + ftrace_stub_graph = ftrace_stub; > #endif > #else > # ifdef CONFIG_FUNCTION_TRACER > -# define MCOUNT_REC() ftrace_graph_stub = ftrace_stub; > +# define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; > # else > # define MCOUNT_REC() > # endif > diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c > index fa3ce10d0405..67e0c462b059 100644 > --- a/kernel/trace/fgraph.c > +++ b/kernel/trace/fgraph.c > @@ -336,10 +336,10 @@ int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace) > * Simply points to ftrace_stub, but with the proper protocol. > * Defined by the linker script in linux/vmlinux.lds.h > */ > -extern void ftrace_graph_stub(struct ftrace_graph_ret *); > +extern void ftrace_stub_graph(struct ftrace_graph_ret *); > > /* The callbacks that hook a function */ > -trace_func_graph_ret_t ftrace_graph_return = ftrace_graph_stub; > +trace_func_graph_ret_t ftrace_graph_return = ftrace_stub_graph; > trace_func_graph_ent_t ftrace_graph_entry = ftrace_graph_entry_stub; > static trace_func_graph_ent_t __ftrace_graph_entry = ftrace_graph_entry_stub; > > @@ -619,7 +619,7 @@ void unregister_ftrace_graph(struct fgraph_ops *gops) > goto out; > > ftrace_graph_active--; > - ftrace_graph_return = ftrace_graph_stub; > + ftrace_graph_return = ftrace_stub_graph; > ftrace_graph_entry = ftrace_graph_entry_stub; > __ftrace_graph_entry = ftrace_graph_entry_stub; > ftrace_shutdown(&graph_ops, FTRACE_STOP_FUNC_RET);