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authorTom Lendacky <thomas.lendacky@amd.com>2017-09-29 11:24:19 -0500
committerIngo Molnar <mingo@kernel.org>2017-09-29 19:37:51 +0200
commitbc829ee36e0ec92383c9d9b88fe08f00d4d592f8 (patch)
treebb467dfcdca2a208d8dbac21d1b810442fb79916
parent520a13c530aeb5f63e011d668c42db1af19ed349 (diff)
downloadlinux-bc829ee36e0ec92383c9d9b88fe08f00d4d592f8.tar.bz2
x86/mm: Disable branch profiling in mem_encrypt.c
Some routines in mem_encrypt.c are called very early in the boot process, e.g. sme_encrypt_kernel(). When CONFIG_TRACE_BRANCH_PROFILING=y is defined the resulting branch profiling associated with the check to see if SME is active results in a kernel crash. Disable branch profiling for mem_encrypt.c by defining DISABLE_BRANCH_PROFILING before including any header files. Reported-by: kernel test robot <lkp@01.org> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Acked-by: Borislav Petkov <bp@suse.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170929162419.6016.53390.stgit@tlendack-t1.amdoffice.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/x86/mm/mem_encrypt.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 3fcc8e01683b..16c5f37933a2 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -10,6 +10,8 @@
* published by the Free Software Foundation.
*/
+#define DISABLE_BRANCH_PROFILING
+
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/mm.h>