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Mon, 18 Apr 2022 06:24:44 -0700 (PDT) Message-ID: Date: Mon, 18 Apr 2022 21:24:36 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: [PATCH v4 1/2] ftrace: cleanup ftrace_graph_caller enable and disable Content-Language: en-US To: rostedt@goodmis.org, mingo@redhat.com, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, broonie@kernel.org, mark.rutland@arm.com, ardb@kernel.org, linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, duanxiongchun@bytedance.com, songmuchun@bytedance.com References: <20220409153554.14470-1-zhouchengming@bytedance.com> From: Chengming Zhou In-Reply-To: <20220409153554.14470-1-zhouchengming@bytedance.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220418_062446_075188_EF68C58D X-CRM114-Status: GOOD ( 21.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Hello, friendly ping :-) On 2022/4/9 23:35, Chengming Zhou wrote: > The ftrace_[enable,disable]_ftrace_graph_caller() are used to do > special hooks for graph tracer, which are not needed on some ARCHs > that use graph_ops:func function to install return_hooker. > > So introduce the weak version in ftrace core code to cleanup > in x86. > > Signed-off-by: Chengming Zhou > --- > v4: > - put weak ftrace_enable,disable_ftrace_graph_caller() in > fgraph.c instead of ftrace.c as suggested by Steve. > > v3: > - consolidate two #if into a single #if, suggested by Steve. Thanks. > --- > arch/x86/kernel/ftrace.c | 17 ++--------------- > kernel/trace/fgraph.c | 18 ++++++++++++++++++ > 2 files changed, 20 insertions(+), 15 deletions(-) > > diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c > index 1e31c7d21597..b09d73c2ba89 100644 > --- a/arch/x86/kernel/ftrace.c > +++ b/arch/x86/kernel/ftrace.c > @@ -579,9 +579,7 @@ void arch_ftrace_trampoline_free(struct ftrace_ops *ops) > > #ifdef CONFIG_FUNCTION_GRAPH_TRACER > > -#ifdef CONFIG_DYNAMIC_FTRACE > - > -#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS > +#if defined(CONFIG_DYNAMIC_FTRACE) && !defined(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS) > extern void ftrace_graph_call(void); > static const char *ftrace_jmp_replace(unsigned long ip, unsigned long addr) > { > @@ -610,18 +608,7 @@ int ftrace_disable_ftrace_graph_caller(void) > > return ftrace_mod_jmp(ip, &ftrace_stub); > } > -#else /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ > -int ftrace_enable_ftrace_graph_caller(void) > -{ > - return 0; > -} > - > -int ftrace_disable_ftrace_graph_caller(void) > -{ > - return 0; > -} > -#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ > -#endif /* !CONFIG_DYNAMIC_FTRACE */ > +#endif /* CONFIG_DYNAMIC_FTRACE && !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ > > /* > * Hook the return address and push it in the stack of return addrs > diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c > index 8f4fb328133a..289311680c29 100644 > --- a/kernel/trace/fgraph.c > +++ b/kernel/trace/fgraph.c > @@ -30,6 +30,24 @@ int ftrace_graph_active; > /* Both enabled by default (can be cleared by function_graph tracer flags */ > static bool fgraph_sleep_time = true; > > +/* > + * archs can override this function if they must do something > + * to enable hook for graph tracer. > + */ > +int __weak ftrace_enable_ftrace_graph_caller(void) > +{ > + return 0; > +} > + > +/* > + * archs can override this function if they must do something > + * to disable hook for graph tracer. > + */ > +int __weak ftrace_disable_ftrace_graph_caller(void) > +{ > + return 0; > +} > + > /** > * ftrace_graph_stop - set to permanently disable function graph tracing > * _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel