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Date: Thu, 18 Feb 2016 17:26:56 +0100 From: Arnd Bergmann <arnd@...db.de> To: linux-arm-kernel@...ts.infradead.org Cc: Nicolas Pitre <nicolas.pitre@...aro.org>, Jon Medhurst <tixy@...aro.org>, Russell King <linux@....linux.org.uk>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Marc Zyngier <marc.zyngier@....com>, linux-kernel@...r.kernel.org Subject: [PATCH v2] ARM: atags_to_fdt: don't warn about stack size 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 slightly increasing the limit for this file. Signed-off-by: Arnd Bergmann <arnd@...db.de> --- On Thursday 18 February 2016 11:13:52 Nicolas Pitre wrote: > What about setting the warning to 2048 instead? Sure, actually 1280 is more than enough I think. diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 7a6a58ef8aaf..2cc63038d6c8 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_atags_to_fdt.o += -Wframe-larger-than=1280 + ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y) OBJS += $(libfdt_objs) atags_to_fdt.o endif
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