From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Date: Tue, 11 Dec 2012 09:11:34 +0000 (+0800)
Subject: x86/kexec: crash_vmclear_local_vmcss needs __rcu
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0ca0d818cbcbcac75a02833861b6fc42a98b904e;p=linux-beck.git

x86/kexec: crash_vmclear_local_vmcss needs __rcu

This removes the sparse warning:
arch/x86/kernel/crash.c:49:32: sparse: incompatible types in comparison expression (different address spaces)

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
index 28feeba2fdd6..6080d2694bad 100644
--- a/arch/x86/include/asm/kexec.h
+++ b/arch/x86/include/asm/kexec.h
@@ -163,7 +163,8 @@ struct kimage_arch {
 };
 #endif
 
-extern void (*crash_vmclear_loaded_vmcss)(void);
+typedef void crash_vmclear_fn(void);
+extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss;
 
 #endif /* __ASSEMBLY__ */
 
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 2f6b8e838d18..74467feb4dc5 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -38,12 +38,12 @@ int in_crash_kexec;
  *
  * protected by rcu.
  */
-void (*crash_vmclear_loaded_vmcss)(void) = NULL;
+crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss = NULL;
 EXPORT_SYMBOL_GPL(crash_vmclear_loaded_vmcss);
 
 static inline void cpu_crash_vmclear_loaded_vmcss(void)
 {
-	void (*do_vmclear_operation)(void) = NULL;
+	crash_vmclear_fn *do_vmclear_operation = NULL;
 
 	rcu_read_lock();
 	do_vmclear_operation = rcu_dereference(crash_vmclear_loaded_vmcss);