From 351fdddd366245c0fb4636f32edfb4198c8d6b8c Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Tue, 12 Dec 2017 09:57:47 +0000 Subject: MIPS: VDSO: Prevent use of smp_processor_id() VDSO code should not be using smp_processor_id(), since it is executed in user mode. Introduce a VDSO-specific path which will cause a compile-time or link-time error (depending upon support for __compiletime_error) if the VDSO ever incorrectly attempts to use smp_processor_id(). [Matt Redfearn : Move before change to smp_processor_id in series] Signed-off-by: Paul Burton Signed-off-by: Matt Redfearn Patchwork: https://patchwork.linux-mips.org/patch/17932/ Cc: Ralf Baechle Cc: James Hogan Cc: linux-mips@linux-mips.org --- arch/mips/vdso/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/mips/vdso') diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile index ce196046ac3e..477c463c89ec 100644 --- a/arch/mips/vdso/Makefile +++ b/arch/mips/vdso/Makefile @@ -7,7 +7,8 @@ ccflags-vdso := \ $(filter -I%,$(KBUILD_CFLAGS)) \ $(filter -E%,$(KBUILD_CFLAGS)) \ $(filter -mmicromips,$(KBUILD_CFLAGS)) \ - $(filter -march=%,$(KBUILD_CFLAGS)) + $(filter -march=%,$(KBUILD_CFLAGS)) \ + -D__VDSO__ cflags-vdso := $(ccflags-vdso) \ $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \ -- cgit v1.2.3