On Thu, 18 Feb 2016, Arnd Bergmann wrote: > The merge_fdt_bootargs() function by definition consumes more than 1024 > bytes of stack because it has a 1024 byte command line on the stack, > meaning that we always get a warning when building this file: > > arch/arm/boot/compressed/atags_to_fdt.c: In function 'merge_fdt_bootargs': > arch/arm/boot/compressed/atags_to_fdt.c:98:1: warning: the frame size of 1032 > bytes is larger than 1024 bytes [-Wframe-larger-than=] > > However, as this is the decompressor and we know that it has a very shallow > call chain, and we do not actually risk overflowing the kernel stack > at runtime here. > > This just shuts up the warning by disabling the warning flag for this > file.
What about setting the warning to 2048 instead? > > Signed-off-by: Arnd Bergmann <[email protected]> > --- > arch/arm/boot/compressed/Makefile | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm/boot/compressed/Makefile > b/arch/arm/boot/compressed/Makefile > index 7a6a58ef8aaf..b5db4c868640 100644 > --- a/arch/arm/boot/compressed/Makefile > +++ b/arch/arm/boot/compressed/Makefile > @@ -85,6 +85,8 @@ $(addprefix $(obj)/,$(libfdt) $(libfdt_hdrs)): $(obj)/%: > $(srctree)/scripts/dtc/ > $(addprefix $(obj)/,$(libfdt_objs) atags_to_fdt.o): \ > $(addprefix $(obj)/,$(libfdt_hdrs)) > > +CFLAGS_REMOVE_atags_to_fdt.o += -Wframe-larger-than=${CONFIG_FRAME_WARN} > + > ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y) > OBJS += $(libfdt_objs) atags_to_fdt.o > endif > -- > 2.7.0 > >
