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

KAGA-KOKO · suryasaimadhu · commit 21953ee5013d · 2020-04-26T20:16:46.000+02:00
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@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200421092558.939985695@linutronix.de
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
@@ -387,7 +387,9 @@ void native_write_cr4(unsigned long val)
 			  bits_missing);
 	}
 }
+#if IS_MODULE(CONFIG_LKDTM)
 EXPORT_SYMBOL_GPL(native_write_cr4);
+#endif
 
 void cr4_update_irqsoff(unsigned long set, unsigned long clear)
 {

Original file line number	Diff line number	Diff line change
`@@ -387,7 +387,9 @@ void native_write_cr4(unsigned long val)`
`387`	`387`	`bits_missing);`
`388`	`388`	`}`
`389`	`389`	`}`
	`390`	`+#if IS_MODULE(CONFIG_LKDTM)`
`390`	`391`	`EXPORT_SYMBOL_GPL(native_write_cr4);`
	`392`	`+#endif`
`391`	`393`
`392`	`394`	`void cr4_update_irqsoff(unsigned long set, unsigned long clear)`
`393`	`395`	`{`