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Message-ID: <20110528153417.GB25869@alboin.amr.corp.intel.com> Date: Sat, 28 May 2011 08:34:17 -0700 From: Andi Kleen <ak@...ux.intel.com> To: Måns Rullgård <mans@...sr.com> Cc: Catalin Marinas <catalin.marinas@....com>, Russell King - ARM Linux <linux@....linux.org.uk>, Nicolas Pitre <nico@...xnic.net>, Will Deacon <Will.Deacon@....com>, lkml <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, sam@...nborg.org, linux-arm-kernel@...ts.infradead.org Subject: [PATCH] Disable -fconserve-stack on ARM Here's a untested but straight forward patch to disable it. -Andi --- Disable -fconserve-stack on ARM There are reports that -fconserve-stack misaligns variables on the stack. Disable it for ARM to work around this gcc bug. Signed-off-by: Andi Kleen <ak@...ux.intel.com> diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 25750bc..0883cff 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -41,6 +41,10 @@ ifeq ($(CONFIG_CC_STACKPROTECTOR),y) KBUILD_CFLAGS +=-fstack-protector endif +# ARM gcc developers unfortunately broke -fconserve-stack. It misaligns +# variables on the stack +KBUILD_CFLAGS += $(call cc-option,-fno-conserve-stack) + ifeq ($(CONFIG_CPU_BIG_ENDIAN),y) KBUILD_CPPFLAGS += -mbig-endian AS += -EB -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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