change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/arch/x86/include/asm/qspinlock.h
..
..
@@ -11,20 +11,17 @@
11
11
 #define _Q_PENDING_LOOPS	(1 << 9)
12
12
 
13
13
 #define queued_fetch_set_pending_acquire queued_fetch_set_pending_acquire
14
-
15
-static __always_inline bool __queued_RMW_btsl(struct qspinlock *lock)
16
-{
17
-	GEN_BINARY_RMWcc(LOCK_PREFIX "btsl", lock->val.counter,
18
-			 "I", _Q_PENDING_OFFSET, "%0", c);
19
-}
20
-
21
14
 static __always_inline u32 queued_fetch_set_pending_acquire(struct qspinlock *lock)
22
15
 {
23
-	u32 val = 0;
16
+	u32 val;
24
17
 
25
-	if (__queued_RMW_btsl(lock))
26
-		val |= _Q_PENDING_VAL;
27
-
18
+	/*
19
+	 * We can't use GEN_BINARY_RMWcc() inside an if() stmt because asm goto
20
+	 * and CONFIG_PROFILE_ALL_BRANCHES=y results in a label inside a
21
+	 * statement expression, which GCC doesn't like.
22
+	 */
23
+	val = GEN_BINARY_RMWcc(LOCK_PREFIX "btsl", lock->val.counter, c,
24
+			       "I", _Q_PENDING_OFFSET) * _Q_PENDING_VAL;
28
25
 	val |= atomic_read(&lock->val) & ~_Q_PENDING_MASK;
29
26
 
30
27
 	return val;
..
..
@@ -35,6 +32,7 @@
35
32
 extern void __pv_init_lock_hash(void);
36
33
 extern void __pv_queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);
37
34
 extern void __raw_callee_save___pv_queued_spin_unlock(struct qspinlock *lock);
35
+extern bool nopvspin;
38
36
 
39
37
 #define	queued_spin_unlock queued_spin_unlock
40
38
 /**
..
..
@@ -66,10 +64,25 @@
66
64
 #endif
67
65
 
68
66
 #ifdef CONFIG_PARAVIRT
67
+/*
68
+ * virt_spin_lock_key - enables (by default) the virt_spin_lock() hijack.
69
+ *
70
+ * Native (and PV wanting native due to vCPU pinning) should disable this key.
71
+ * It is done in this backwards fashion to only have a single direction change,
72
+ * which removes ordering between native_pv_spin_init() and HV setup.
73
+ */
69
74
 DECLARE_STATIC_KEY_TRUE(virt_spin_lock_key);
70
75
 
71
76
 void native_pv_lock_init(void) __init;
72
77
 
78
+/*
79
+ * Shortcut for the queued_spin_lock_slowpath() function that allows
80
+ * virt to hijack it.
81
+ *
82
+ * Returns:
83
+ *   true - lock has been negotiated, all done;
84
+ *   false - queued_spin_lock_slowpath() will do its thing.
85
+ */
73
86
 #define virt_spin_lock virt_spin_lock
74
87
 static inline bool virt_spin_lock(struct qspinlock *lock)
75
88
 {