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authorTom Lendacky <thomas.lendacky@amd.com>2018-02-27 02:25:54 +0300
committerThomas Gleixner <tglx@linutronix.de>2018-02-28 17:24:12 +0300
commitae8d1d0061ad7996c2c5e769e809a593544fa145 (patch)
treef89d79990bb9af94618f69159e11e34b00cf04ae /arch/x86/mm/Makefile
parent1ea4fe84973854a7302e4d1c479f10ae25a93e4a (diff)
downloadlinux-ae8d1d0061ad7996c2c5e769e809a593544fa145.tar.xz
x86/mm/sme: Disable stack protection for mem_encrypt_identity.c
Stack protection is not compatible with early boot code. All of the early SME boot code is now isolated in a separate file, mem_encrypt_identity.c, so arch/x86/mm/Makefile can be updated to turn off stack protection for the entire file. This eliminates the need to worry about other functions within the file being instrumented with stack protection (as was seen when a newer version of GCC instrumented sme_encrypt_kernel() where an older version hadn't). It also allows removal of the __nostackprotector attribute from individual functions. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Link: https://lkml.kernel.org/r/20180226232554.14108.16881.stgit@tlendack-t1.amdoffice.net
Diffstat (limited to 'arch/x86/mm/Makefile')
-rw-r--r--arch/x86/mm/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 03c6c8561623..4b101dd6e52f 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -19,6 +19,7 @@ obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o pageattr.o mmap.o \
nostackp := $(call cc-option, -fno-stack-protector)
CFLAGS_physaddr.o := $(nostackp)
CFLAGS_setup_nx.o := $(nostackp)
+CFLAGS_mem_encrypt_identity.o := $(nostackp)
CFLAGS_fault.o := -I$(src)/../include/asm/trace