On 08/13/2012 01:57 PM, Thai Bui wrote: > Putting DEBUG_INITCALL config option to compile out the command-line option > "initcall_debug". The patch description does not tell us Why. presumably to save some memory? How much memory is saved by disabling DEBUG_INITCALL? > Signed-off-by: Thai Bui <blquythai@xxxxxxxxx> > Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx> > --- > Documentation/kernel-parameters.txt | 3 ++- > include/linux/init.h | 4 ++++ > init/main.c | 2 ++ > lib/Kconfig.debug | 9 +++++++++ > 4 files changed, 17 insertions(+), 1 deletion(-) > > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt > index d99fd9c..3dbaf15 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -1026,7 +1026,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. > > initcall_debug [KNL] Trace initcalls as they are executed. Useful > for working out where the kernel is dying during > - startup. > + startup. DEBUG_INITCALL needs to be enabled in order > + for this option to work. > > initrd= [BOOT] Specify the location of the initial ramdisk > > diff --git a/include/linux/init.h b/include/linux/init.h > index 6b95109..d2f31f1 100644 > --- a/include/linux/init.h > +++ b/include/linux/init.h > @@ -157,7 +157,11 @@ void prepare_namespace(void); > > extern void (*late_time_init)(void); > > +#ifdef CONFIG_DEBUG_INITCALL > extern bool initcall_debug; > +#else > +static const bool initcall_debug = false; > +#endif /* CONFIG_DEBUG_INITCALL */ > > #endif > > diff --git a/init/main.c b/init/main.c > index ff49a6d..65837f7 100644 > --- a/init/main.c > +++ b/init/main.c > @@ -648,8 +648,10 @@ static void __init do_ctors(void) > #endif > } > > +#ifdef CONFIG_DEBUG_INITCALL > bool initcall_debug; > core_param(initcall_debug, initcall_debug, bool, 0644); > +#endif /* CONFIG_DEBUG_INITCALL */ > > static char msgbuf[64]; > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 8745ac7..424ac93 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -769,6 +769,15 @@ config DEBUG_WRITECOUNT > > If unsure, say N. > > +config DEBUG_INITCALL > + bool "Debug initcalls as they are executed" > + depends on DEBUG_KERNEL > + help > + Enable this for tracing initcalls during startup. Useful for working > + out where the kernel is dying during startup. > + > + If unsure, say N > + > config DEBUG_MEMORY_INIT > bool "Debug memory initialisation" if EXPERT > default !EXPERT -- ~Randy -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
