From: Tom Lendacky <thomas.lendacky@amd.com>
To: x86@kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH] x86/mm: Disable branch profiling in mem_encrypt.c
Date: Fri, 29 Sep 2017 11:24:19 -0500
Message-ID: <20170929162419.6016.53390.stgit@tlendack-t1.amdoffice.net> (raw)
Some routines in mem_encrypt.c are called very early in the boot process,
e.g. sme_encrypt_kernel(). When CONFIG_TRACE_BRANCH_PROFILING 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>
---
arch/x86/mm/mem_encrypt.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 3fcc8e0..16c5f37 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>
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Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-29 16:24 Tom Lendacky [this message]
2017-09-29 16:51 ` Borislav Petkov
2017-09-29 20:15 ` [tip:x86/urgent] " tip-bot for Tom Lendacky
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