On Sat, Sep 08, 2012 at 05:47:50PM -0300, Ezequiel Garcia wrote: > As its name suggest this option prevents gcc from auto inlining > small functions. This is very important if one wants to obtain > traces with accurate call sites. > > Without this option, gcc will collapse some small functions, > even when not marked as 'inline' thus making impossible to > correlate the trace caller address to the real function it belongs. > > Of course, the resultant kernel is slower and slightly smaller, > but that's not an issue if the focus is on tracing accuracy. > > Cc: Michal Marek <mmarek@xxxxxxx> > Signed-off-by: Ezequiel Garcia <elezegarcia@xxxxxxxxx> > --- > Makefile | 4 ++++ > lib/Kconfig.debug | 11 +++++++++++ > 2 files changed, 15 insertions(+), 0 deletions(-) > > diff --git a/Makefile b/Makefile > index ddf5be9..df6045a 100644 > --- a/Makefile > +++ b/Makefile > @@ -561,6 +561,10 @@ else > KBUILD_CFLAGS += -O2 > endif > > +ifdef CONFIG_DISABLE_GCC_AUTOMATIC_INLINING > +KBUILD_CFLAGS += -fno-inline-small-functions > +endif > + > include $(srctree)/arch/$(SRCARCH)/Makefile > > ifdef CONFIG_READABLE_ASM > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 2403a63..c8fd50f 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -1265,6 +1265,17 @@ config LATENCYTOP > source mm/Kconfig.debug > source kernel/trace/Kconfig > > +config DISABLE_GCC_AUTOMATIC_INLINING > + bool "Disable gcc automatic inlining" Could we please call this option for: config CC_DISABLE_AUTOMATIC_INLINING We have at least a few other options following that naming scheme. And today we have no options named *GCC_* Sam -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>