From ba96301ce9be7925cdaee677b1a2ff8eddba9fd4 Mon Sep 17 00:00:00 2001 From: "Naveen N. Rao" Date: Thu, 5 Mar 2020 20:05:30 +0530 Subject: [PATCH] powerpc: Suppress .eh_frame generation GCC v8 defaults to enabling -fasynchronous-unwind-tables due to https://gcc.gnu.org/r259298, which results in .eh_frame section being generated. This results in additional disk usage by the build, as well as the kernel modules. Since the kernel has no use for this, this section is discarded. Add -fno-asynchronous-unwind-tables to KBUILD_CFLAGS to suppress generation of .eh_frame section. Note that our VDSOs need .eh_frame, but are not affected by this change since our VDSO code are all in assembly. Reported-by: Rasmus Villemoes Signed-off-by: Naveen N. Rao Reviewed-by: Segher Boessenkool Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1ed7cd84a7d1a3180b30c0c60e70eed8bb8b40c3.1583415544.git.naveen.n.rao@linux.vnet.ibm.com --- arch/powerpc/Makefile | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 89956c4f1ce3..f310c32e88a4 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -239,6 +239,9 @@ KBUILD_CFLAGS += $(call cc-option,-mno-vsx) KBUILD_CFLAGS += $(call cc-option,-mno-spe) KBUILD_CFLAGS += $(call cc-option,-mspe=no) +# Don't emit .eh_frame since we have no use for it +KBUILD_CFLAGS += -fno-asynchronous-unwind-tables + # Never use string load/store instructions as they are # often slow when they are implemented at all KBUILD_CFLAGS += $(call cc-option,-mno-string)