X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Flinux%2Fsmp_lock.h;h=813be59bf3458785c00b3042645adb8a68a6b558;hb=6e15cf04860074ad032e88c306bea656bbdd0f22;hp=aab3a4cff4e13da65a50ec50531ccfd8ed19444d;hpb=4f4ae0d42680889c62db4e1f3e6b4aa7787a7257;p=firefly-linux-kernel-4.4.55.git

diff --git a/include/linux/smp_lock.h b/include/linux/smp_lock.h
index aab3a4cff4e1..813be59bf345 100644
--- a/include/linux/smp_lock.h
+++ b/include/linux/smp_lock.h
@@ -27,11 +27,24 @@ static inline int reacquire_kernel_lock(struct task_struct *task)
 extern void __lockfunc lock_kernel(void)	__acquires(kernel_lock);
 extern void __lockfunc unlock_kernel(void)	__releases(kernel_lock);
 
+/*
+ * Various legacy drivers don't really need the BKL in a specific
+ * function, but they *do* need to know that the BKL became available.
+ * This function just avoids wrapping a bunch of lock/unlock pairs
+ * around code which doesn't really need it.
+ */
+static inline void cycle_kernel_lock(void)
+{
+	lock_kernel();
+	unlock_kernel();
+}
+
 #else
 
 #define lock_kernel()				do { } while(0)
 #define unlock_kernel()				do { } while(0)
 #define release_kernel_lock(task)		do { } while(0)
+#define cycle_kernel_lock()			do { } while(0)
 #define reacquire_kernel_lock(task)		0
 #define kernel_locked()				1