On 2021-01-22 17:07:50 [-0500], Steven Rostedt wrote: > On Wed, 13 Jan 2021 00:00:55 +0100 > Sebastian Andrzej Siewior <bige...@linutronix.de> wrote: > > > +unsigned int _tracing_gen_ctx_flags(unsigned long irqflags); > > +unsigned int tracing_gen_ctx_flags(void); > > +unsigned int tracing_gen_ctx_flags_dect(void); > > Since I'm now trying to avoid underscore functions when possible, the above > should be: > > _tracing_gen_ctx_flags() --> tracing_gen_ctx_flags() > tracing_gen_ctx_flags() --> tracing_gen_ctx() > tracing_gen_ctx_flags_dect --> tracing_gen_ctx_dec() > > Note, "_dec()" should be used instead of "_dect()" as "_dec" is commonly > used around the kernel, and I had really no idea what "_dect" was, until I > looked at the two functions.
Okay, let me do the renames. > And looking at the implementation, I wonder if we should make this into > static inlines in the header as follows: > > unsigned int tracing_gen_ctx_irq_test(int irqs_status); > > #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT > static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags) > { > unsigned int irq_status = irqs_disabled(irqflags) ? > TRACE_FLAG_IRQS_OFF : 0; > return tracing_gen_ctx_irq_test(irq_status); > } > static inline unsigned int tracing_gen_ctx(void) > { > unsigned long irqflags; > > local_save_flags(irqflags); > return tracing_gen_ctx_flags(irqflags); > } > #else > static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags) > { > return tracing_gen_ctx_irq_test(TRACE_FLAG_IRQS_NOSUPPORT); > } > static inline unsigned int tracing_gen_ctx(void) > { > return tracing_gen_ctx_irq_test(TRACE_FLAG_IRQS_NOSUPPORT); > } > #endif > > static inline unsigned int tracing_gen_ctx_dec(void) > { > unsigned int trace_ctx; > > trace_ctx = tracing_gen_ctx(); > /*** Comment about buffer_reserve here ***/ > if (IS_ENABLED(CONFIG_PREEMPTION)) > trace_ctx--; > return trace_ctx; > } > > Then all you need to do is implement the tracing_gen_ctx_irq_test() without > adding and #ifdefs in it, and just or in the "irq_status" to trace_flags, > without any conditionals. You just moved that from one place to another. I had to move enum trace_flag_type just before tracing_gen_ctx_irq_test() so it is available by tracing_gen_ctx_flags(). I don't know if you earn by inlining much, the gcc numbers for vmlinux: text data bss dec filename 24306853 21869070 14205180 60381103 vmlinux-rc5 24306482 21869070 14205180 60380732 vmlinux-rc5-merge-irqflags 24306852 21869070 14205180 60381102 vmlinux-rc5-merge-irqflags-inline I know that a reduction by ~300 byte isn't exactly breath taking. I run the test twice because the reduction in text by one byte looked odd but it is what it is. Inlining only tracing_gen_ctx_dec() probably makes sense especially since there is one user. I can post the irqflags-merge and the inlinining as two seprate patches and you can then decide if you merge the two patches or drop the inlining. > -- Steve Sebastian