Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/x86_64/Makefile |    2 ++
 1 file changed, 2 insertions(+)

diff -puN arch/x86_64/Makefile~x86_64-mm-less-stack-alignment arch/x86_64/Makefile
--- a/arch/x86_64/Makefile~x86_64-mm-less-stack-alignment
+++ a/arch/x86_64/Makefile
@@ -58,6 +58,8 @@ cflags-y += $(call cc-option,-mno-sse -m
 # newer gccs do it by default
 cflags-y += -maccumulate-outgoing-args
 
+CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
+
 # do binutils support CFI?
 cflags-y += $(call as-instr,.cfi_startproc\n.cfi_rel_offset rsp${comma}0\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
 KBUILD_AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_rel_offset rsp${comma}0\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
_