[tip: x86/mm] x86/cpu: Export native_write_cr4() only when CONFIG_LKTDM=m

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     21953ee5013d6632bee90ec89f2df59c69050db0
Gitweb:        https://git.kernel.org/tip/21953ee5013d6632bee90ec89f2df59c69050db0
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Sun, 26 Apr 2020 18:55:15 +02:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Sun, 26 Apr 2020 20:16:46 +02:00

x86/cpu: Export native_write_cr4() only when CONFIG_LKTDM=m

Modules have no business poking into this but fixing this is for later.

 [ bp: Carve out from an earlier patch. ]

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lkml.kernel.org/r/20200421092558.939985695@xxxxxxxxxxxxx
---
 arch/x86/kernel/cpu/common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 82042f4..eab3ebd 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -387,7 +387,9 @@ set_register:
 			  bits_missing);
 	}
 }
+#if IS_MODULE(CONFIG_LKDTM)
 EXPORT_SYMBOL_GPL(native_write_cr4);
+#endif
 
 void cr4_update_irqsoff(unsigned long set, unsigned long clear)
 {