* [PATCH RESEND v3 1/2] ftrace: cleanup ftrace_graph_caller enable and disable @ 2022-04-09 8:54 ` Chengming Zhou 0 siblings, 0 replies; 8+ messages in thread From: Chengming Zhou @ 2022-04-09 8:54 UTC (permalink / raw) To: rostedt, mingo, catalin.marinas, will, tglx, bp, dave.hansen, x86, hpa, broonie, mark.rutland, ardb, zhouchengming, linux-arm-kernel Cc: linux-kernel, duanxiongchun, songmuchun 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 <zhouchengming@bytedance.com> --- v3: - consolidate two #if into a single #if, suggested by Steve. Thanks. --- arch/x86/kernel/ftrace.c | 17 ++--------------- kernel/trace/ftrace.c | 20 ++++++++++++++++++++ 2 files changed, 22 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/ftrace.c b/kernel/trace/ftrace.c index 4f1d2f5e7263..30622c755c77 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2721,6 +2721,26 @@ int __weak ftrace_arch_code_modify_post_process(void) return 0; } +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +/* + * 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; +} +#endif + void ftrace_modify_all_code(int command) { int update = command & FTRACE_UPDATE_TRACE_FUNC; -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH RESEND v3 1/2] ftrace: cleanup ftrace_graph_caller enable and disable @ 2022-04-09 8:54 ` Chengming Zhou 0 siblings, 0 replies; 8+ messages in thread From: Chengming Zhou @ 2022-04-09 8:54 UTC (permalink / raw) To: rostedt, mingo, catalin.marinas, will, tglx, bp, dave.hansen, x86, hpa, broonie, mark.rutland, ardb, zhouchengming, linux-arm-kernel Cc: linux-kernel, duanxiongchun, songmuchun 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 <zhouchengming@bytedance.com> --- v3: - consolidate two #if into a single #if, suggested by Steve. Thanks. --- arch/x86/kernel/ftrace.c | 17 ++--------------- kernel/trace/ftrace.c | 20 ++++++++++++++++++++ 2 files changed, 22 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/ftrace.c b/kernel/trace/ftrace.c index 4f1d2f5e7263..30622c755c77 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2721,6 +2721,26 @@ int __weak ftrace_arch_code_modify_post_process(void) return 0; } +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +/* + * 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; +} +#endif + void ftrace_modify_all_code(int command) { int update = command & FTRACE_UPDATE_TRACE_FUNC; -- 2.20.1 ^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH RESEND v3 2/2] arm64/ftrace: Make function graph use ftrace directly 2022-04-09 8:54 ` Chengming Zhou @ 2022-04-09 8:55 ` Chengming Zhou -1 siblings, 0 replies; 8+ messages in thread From: Chengming Zhou @ 2022-04-09 8:55 UTC (permalink / raw) To: rostedt, mingo, catalin.marinas, will, tglx, bp, dave.hansen, x86, hpa, broonie, mark.rutland, ardb, zhouchengming, linux-arm-kernel Cc: linux-kernel, duanxiongchun, songmuchun As we do in commit 0c0593b45c9b ("x86/ftrace: Make function graph use ftrace directly"), we don't need special hook for graph tracer, but instead we use graph_ops:func function to install return_hooker. Since commit 3b23e4991fb6 ("arm64: implement ftrace with regs") add implementation for FTRACE_WITH_REGS on arm64, we can easily adopt the same cleanup on arm64. And this cleanup only changes the FTRACE_WITH_REGS implementation, so the mcount-based implementation is unaffected. Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> --- v3: - Add comments in ftrace_graph_func() as suggested by Steve. Thanks. v2: - Remove FTRACE_WITH_REGS ftrace_graph_caller asm, thanks Mark. --- arch/arm64/include/asm/ftrace.h | 7 +++++++ arch/arm64/kernel/entry-ftrace.S | 17 ----------------- arch/arm64/kernel/ftrace.c | 17 +++++++++++++++++ 3 files changed, 24 insertions(+), 17 deletions(-) diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index 1494cfa8639b..dbc45a4157fa 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -80,8 +80,15 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS struct dyn_ftrace; +struct ftrace_ops; +struct ftrace_regs; + int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ftrace_init_nop ftrace_init_nop + +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs); +#define ftrace_graph_func ftrace_graph_func #endif #define ftrace_return_address(n) return_address(n) diff --git a/arch/arm64/kernel/entry-ftrace.S b/arch/arm64/kernel/entry-ftrace.S index e535480a4069..d42a205ef625 100644 --- a/arch/arm64/kernel/entry-ftrace.S +++ b/arch/arm64/kernel/entry-ftrace.S @@ -97,12 +97,6 @@ SYM_CODE_START(ftrace_common) SYM_INNER_LABEL(ftrace_call, SYM_L_GLOBAL) bl ftrace_stub -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -SYM_INNER_LABEL(ftrace_graph_call, SYM_L_GLOBAL) // ftrace_graph_caller(); - nop // If enabled, this will be replaced - // "b ftrace_graph_caller" -#endif - /* * At the callsite x0-x8 and x19-x30 were live. Any C code will have preserved * x19-x29 per the AAPCS, and we created frame records upon entry, so we need @@ -127,17 +121,6 @@ ftrace_common_return: ret x9 SYM_CODE_END(ftrace_common) -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -SYM_CODE_START(ftrace_graph_caller) - ldr x0, [sp, #S_PC] - sub x0, x0, #AARCH64_INSN_SIZE // ip (callsite's BL insn) - add x1, sp, #S_LR // parent_ip (callsite's LR) - ldr x2, [sp, #PT_REGS_SIZE] // parent fp (callsite's FP) - bl prepare_ftrace_return - b ftrace_common_return -SYM_CODE_END(ftrace_graph_caller) -#endif - #else /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ /* diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c index 4506c4a90ac1..35eb7c9b5e53 100644 --- a/arch/arm64/kernel/ftrace.c +++ b/arch/arm64/kernel/ftrace.c @@ -268,6 +268,22 @@ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent, } #ifdef CONFIG_DYNAMIC_FTRACE + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs) +{ + /* + * Athough graph_ops doesn't have FTRACE_OPS_FL_SAVE_REGS set in flags, + * regs can't be NULL in DYNAMIC_FTRACE_WITH_REGS. By design, it should + * be fixed when DYNAMIC_FTRACE_WITH_ARGS is implemented. + */ + struct pt_regs *regs = arch_ftrace_get_regs(fregs); + unsigned long *parent = (unsigned long *)&procedure_link_pointer(regs); + + prepare_ftrace_return(ip, parent, frame_pointer(regs)); +} +#else /* * Turn on/off the call to ftrace_graph_caller() in ftrace_caller() * depending on @enable. @@ -297,5 +313,6 @@ int ftrace_disable_ftrace_graph_caller(void) { return ftrace_modify_graph_caller(false); } +#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ #endif /* CONFIG_DYNAMIC_FTRACE */ #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH RESEND v3 2/2] arm64/ftrace: Make function graph use ftrace directly @ 2022-04-09 8:55 ` Chengming Zhou 0 siblings, 0 replies; 8+ messages in thread From: Chengming Zhou @ 2022-04-09 8:55 UTC (permalink / raw) To: rostedt, mingo, catalin.marinas, will, tglx, bp, dave.hansen, x86, hpa, broonie, mark.rutland, ardb, zhouchengming, linux-arm-kernel Cc: linux-kernel, duanxiongchun, songmuchun As we do in commit 0c0593b45c9b ("x86/ftrace: Make function graph use ftrace directly"), we don't need special hook for graph tracer, but instead we use graph_ops:func function to install return_hooker. Since commit 3b23e4991fb6 ("arm64: implement ftrace with regs") add implementation for FTRACE_WITH_REGS on arm64, we can easily adopt the same cleanup on arm64. And this cleanup only changes the FTRACE_WITH_REGS implementation, so the mcount-based implementation is unaffected. Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> --- v3: - Add comments in ftrace_graph_func() as suggested by Steve. Thanks. v2: - Remove FTRACE_WITH_REGS ftrace_graph_caller asm, thanks Mark. --- arch/arm64/include/asm/ftrace.h | 7 +++++++ arch/arm64/kernel/entry-ftrace.S | 17 ----------------- arch/arm64/kernel/ftrace.c | 17 +++++++++++++++++ 3 files changed, 24 insertions(+), 17 deletions(-) diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index 1494cfa8639b..dbc45a4157fa 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -80,8 +80,15 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS struct dyn_ftrace; +struct ftrace_ops; +struct ftrace_regs; + int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ftrace_init_nop ftrace_init_nop + +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs); +#define ftrace_graph_func ftrace_graph_func #endif #define ftrace_return_address(n) return_address(n) diff --git a/arch/arm64/kernel/entry-ftrace.S b/arch/arm64/kernel/entry-ftrace.S index e535480a4069..d42a205ef625 100644 --- a/arch/arm64/kernel/entry-ftrace.S +++ b/arch/arm64/kernel/entry-ftrace.S @@ -97,12 +97,6 @@ SYM_CODE_START(ftrace_common) SYM_INNER_LABEL(ftrace_call, SYM_L_GLOBAL) bl ftrace_stub -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -SYM_INNER_LABEL(ftrace_graph_call, SYM_L_GLOBAL) // ftrace_graph_caller(); - nop // If enabled, this will be replaced - // "b ftrace_graph_caller" -#endif - /* * At the callsite x0-x8 and x19-x30 were live. Any C code will have preserved * x19-x29 per the AAPCS, and we created frame records upon entry, so we need @@ -127,17 +121,6 @@ ftrace_common_return: ret x9 SYM_CODE_END(ftrace_common) -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -SYM_CODE_START(ftrace_graph_caller) - ldr x0, [sp, #S_PC] - sub x0, x0, #AARCH64_INSN_SIZE // ip (callsite's BL insn) - add x1, sp, #S_LR // parent_ip (callsite's LR) - ldr x2, [sp, #PT_REGS_SIZE] // parent fp (callsite's FP) - bl prepare_ftrace_return - b ftrace_common_return -SYM_CODE_END(ftrace_graph_caller) -#endif - #else /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ /* diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c index 4506c4a90ac1..35eb7c9b5e53 100644 --- a/arch/arm64/kernel/ftrace.c +++ b/arch/arm64/kernel/ftrace.c @@ -268,6 +268,22 @@ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent, } #ifdef CONFIG_DYNAMIC_FTRACE + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs) +{ + /* + * Athough graph_ops doesn't have FTRACE_OPS_FL_SAVE_REGS set in flags, + * regs can't be NULL in DYNAMIC_FTRACE_WITH_REGS. By design, it should + * be fixed when DYNAMIC_FTRACE_WITH_ARGS is implemented. + */ + struct pt_regs *regs = arch_ftrace_get_regs(fregs); + unsigned long *parent = (unsigned long *)&procedure_link_pointer(regs); + + prepare_ftrace_return(ip, parent, frame_pointer(regs)); +} +#else /* * Turn on/off the call to ftrace_graph_caller() in ftrace_caller() * depending on @enable. @@ -297,5 +313,6 @@ int ftrace_disable_ftrace_graph_caller(void) { return ftrace_modify_graph_caller(false); } +#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ #endif /* CONFIG_DYNAMIC_FTRACE */ #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ -- 2.20.1 ^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH RESEND v3 1/2] ftrace: cleanup ftrace_graph_caller enable and disable 2022-04-09 8:54 ` Chengming Zhou @ 2022-04-09 14:23 ` Steven Rostedt -1 siblings, 0 replies; 8+ messages in thread From: Steven Rostedt @ 2022-04-09 14:23 UTC (permalink / raw) To: Chengming Zhou Cc: mingo, catalin.marinas, will, tglx, bp, dave.hansen, x86, hpa, broonie, mark.rutland, ardb, linux-arm-kernel, linux-kernel, duanxiongchun, songmuchun On Sat, 9 Apr 2022 16:54:59 +0800 Chengming Zhou <zhouchengming@bytedance.com> wrote: > --- a/kernel/trace/ftrace.c > +++ b/kernel/trace/ftrace.c > @@ -2721,6 +2721,26 @@ int __weak ftrace_arch_code_modify_post_process(void) > return 0; > } > > +#ifdef CONFIG_FUNCTION_GRAPH_TRACER Actually, can you put this into fgraph.c instead. That only gets compiled if the above config is enabled. Thus, you do not even need to add the #ifdef around it. I intend to move even more code into fgraph.c that is only for function graph. I don't want to add any new code to ftrace.c for it. -- Steve > +/* > + * 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; > +} > +#endif > + > void ftrace_modify_all_code(int command) > { > int update = command & FTRACE_UPDATE_TRACE_FUNC; ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH RESEND v3 1/2] ftrace: cleanup ftrace_graph_caller enable and disable @ 2022-04-09 14:23 ` Steven Rostedt 0 siblings, 0 replies; 8+ messages in thread From: Steven Rostedt @ 2022-04-09 14:23 UTC (permalink / raw) To: Chengming Zhou Cc: mingo, catalin.marinas, will, tglx, bp, dave.hansen, x86, hpa, broonie, mark.rutland, ardb, linux-arm-kernel, linux-kernel, duanxiongchun, songmuchun On Sat, 9 Apr 2022 16:54:59 +0800 Chengming Zhou <zhouchengming@bytedance.com> wrote: > --- a/kernel/trace/ftrace.c > +++ b/kernel/trace/ftrace.c > @@ -2721,6 +2721,26 @@ int __weak ftrace_arch_code_modify_post_process(void) > return 0; > } > > +#ifdef CONFIG_FUNCTION_GRAPH_TRACER Actually, can you put this into fgraph.c instead. That only gets compiled if the above config is enabled. Thus, you do not even need to add the #ifdef around it. I intend to move even more code into fgraph.c that is only for function graph. I don't want to add any new code to ftrace.c for it. -- Steve > +/* > + * 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; > +} > +#endif > + > void ftrace_modify_all_code(int command) > { > int update = command & FTRACE_UPDATE_TRACE_FUNC; _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [External] Re: [PATCH RESEND v3 1/2] ftrace: cleanup ftrace_graph_caller enable and disable 2022-04-09 14:23 ` Steven Rostedt @ 2022-04-09 15:06 ` Chengming Zhou -1 siblings, 0 replies; 8+ messages in thread From: Chengming Zhou @ 2022-04-09 15:06 UTC (permalink / raw) To: Steven Rostedt Cc: mingo, catalin.marinas, will, tglx, bp, dave.hansen, x86, hpa, broonie, mark.rutland, ardb, linux-arm-kernel, linux-kernel, duanxiongchun, songmuchun On 2022/4/9 22:23, Steven Rostedt wrote: > On Sat, 9 Apr 2022 16:54:59 +0800 > Chengming Zhou <zhouchengming@bytedance.com> wrote: > >> --- a/kernel/trace/ftrace.c >> +++ b/kernel/trace/ftrace.c >> @@ -2721,6 +2721,26 @@ int __weak ftrace_arch_code_modify_post_process(void) >> return 0; >> } >> >> +#ifdef CONFIG_FUNCTION_GRAPH_TRACER > > Actually, can you put this into fgraph.c instead. That only gets compiled > if the above config is enabled. Thus, you do not even need to add the > #ifdef around it. > > I intend to move even more code into fgraph.c that is only for function > graph. I don't want to add any new code to ftrace.c for it. Ok, make sense. I will do it. Thanks. > > -- Steve > > >> +/* >> + * 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; >> +} >> +#endif >> + >> void ftrace_modify_all_code(int command) >> { >> int update = command & FTRACE_UPDATE_TRACE_FUNC; > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [External] Re: [PATCH RESEND v3 1/2] ftrace: cleanup ftrace_graph_caller enable and disable @ 2022-04-09 15:06 ` Chengming Zhou 0 siblings, 0 replies; 8+ messages in thread From: Chengming Zhou @ 2022-04-09 15:06 UTC (permalink / raw) To: Steven Rostedt Cc: mingo, catalin.marinas, will, tglx, bp, dave.hansen, x86, hpa, broonie, mark.rutland, ardb, linux-arm-kernel, linux-kernel, duanxiongchun, songmuchun On 2022/4/9 22:23, Steven Rostedt wrote: > On Sat, 9 Apr 2022 16:54:59 +0800 > Chengming Zhou <zhouchengming@bytedance.com> wrote: > >> --- a/kernel/trace/ftrace.c >> +++ b/kernel/trace/ftrace.c >> @@ -2721,6 +2721,26 @@ int __weak ftrace_arch_code_modify_post_process(void) >> return 0; >> } >> >> +#ifdef CONFIG_FUNCTION_GRAPH_TRACER > > Actually, can you put this into fgraph.c instead. That only gets compiled > if the above config is enabled. Thus, you do not even need to add the > #ifdef around it. > > I intend to move even more code into fgraph.c that is only for function > graph. I don't want to add any new code to ftrace.c for it. Ok, make sense. I will do it. Thanks. > > -- Steve > > >> +/* >> + * 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; >> +} >> +#endif >> + >> void ftrace_modify_all_code(int command) >> { >> int update = command & FTRACE_UPDATE_TRACE_FUNC; > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2022-04-09 15:09 UTC | newest] Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-04-09 8:54 [PATCH RESEND v3 1/2] ftrace: cleanup ftrace_graph_caller enable and disable Chengming Zhou 2022-04-09 8:54 ` Chengming Zhou 2022-04-09 8:55 ` [PATCH RESEND v3 2/2] arm64/ftrace: Make function graph use ftrace directly Chengming Zhou 2022-04-09 8:55 ` Chengming Zhou 2022-04-09 14:23 ` [PATCH RESEND v3 1/2] ftrace: cleanup ftrace_graph_caller enable and disable Steven Rostedt 2022-04-09 14:23 ` Steven Rostedt 2022-04-09 15:06 ` [External] " Chengming Zhou 2022-04-09 15:06 ` Chengming Zhou
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