This is a note to let you know that I've just added the patch titled
powerpc: Fix compiling a BE kernel with a powerpc64le toolchain
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: powerpc-fix-compiling-a-be-kernel-with-a-powerpc64le-toolchain.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Tue Dec 12 13:26:17 CET 2017
From: Nicholas Piggin npiggin@gmail.com Date: Sun, 27 Nov 2016 13:46:20 +1100 Subject: powerpc: Fix compiling a BE kernel with a powerpc64le toolchain
From: Nicholas Piggin npiggin@gmail.com
[ Upstream commit 4dc831aa88132f835cefe876aa0206977c4d7710 ]
GCC can compile with either endian, but the default ABI version is set based on the default endianness of the toolchain. Alan Modra says:
you need both -mbig and -mabi=elfv1 to make a powerpc64le gcc generate powerpc64 code
The opposite is true for powerpc64 when generating -mlittle it requires -mabi=elfv2 to generate v2 ABI, which we were already doing.
This change adds ABI annotations together with endianness for all cases, LE and BE. This fixes the case of building a BE kernel with a toolchain that is LE by default.
Signed-off-by: Nicholas Piggin npiggin@gmail.com Tested-by: Naveen N. Rao naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/Makefile | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
--- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -72,8 +72,15 @@ GNUTARGET := powerpc MULTIPLEWORD := -mmultiple endif
-cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian) +ifdef CONFIG_PPC64 +cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1) +cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mcall-aixdesc) +aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1) +aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2 +endif + cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian +cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian) ifneq ($(cc-name),clang) cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align endif @@ -113,7 +120,9 @@ ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y) CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc)) AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2) else +CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc) +AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) endif CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc)) CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
Patches currently in stable-queue which might be from npiggin@gmail.com are
queue-4.9/powerpc-64s-initialize-isav3-mmu-registers-before-setting-partition-table.patch queue-4.9/powerpc-fix-compiling-a-be-kernel-with-a-powerpc64le-toolchain.patch