netdev - [RFC v1 PATCH 1/7] RT: Add local lock stubs.

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Message-Id: <20191207.160408.1854593319545864289.davem@davemloft.net>
Date:   Sat, 07 Dec 2019 16:04:08 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org
CC:     ast@...nel.org, daniel@...earbox.net, tglx@...utronix.de
Subject: [RFC v1 PATCH 1/7] RT: Add local lock stubs.


This will allow us to annotate BPF function calls in
mainline.

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 include/linux/locallock.h | 41 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 include/linux/locallock.h

diff --git a/include/linux/locallock.h b/include/linux/locallock.h
new file mode 100644
index 000000000000..38ecf5bdf99d
--- /dev/null
+++ b/include/linux/locallock.h
@@ -0,0 +1,41 @@
+#ifndef _LINUX_LOCALLOCK_H
+#define _LINUX_LOCALLOCK_H
+
+#include <linux/percpu.h>
+#include <linux/spinlock.h>
+
+#define DEFINE_LOCAL_IRQ_LOCK(lvar)		__typeof__(const int) lvar
+#define DECLARE_LOCAL_IRQ_LOCK(lvar)		extern __typeof__(const int) lvar
+
+static inline void local_irq_lock_init(int lvar) { }
+
+#define local_trylock(lvar)					\
+	({							\
+		preempt_disable();				\
+		1;						\
+	})
+
+#define __local_lock(lvar)			do { } while (0)
+#define __local_unlock(lvar)			do { } while (0)
+#define local_lock(lvar)			preempt_disable()
+#define local_unlock(lvar)			preempt_enable()
+#define local_lock_irq(lvar)			local_irq_disable()
+#define local_unlock_irq(lvar)			local_irq_enable()
+#define local_lock_irqsave(lvar, flags)		local_irq_save(flags)
+#define local_unlock_irqrestore(lvar, flags)	local_irq_restore(flags)
+
+#define local_spin_trylock_irq(lvar, lock)	spin_trylock_irq(lock)
+#define local_spin_lock_irq(lvar, lock)		spin_lock_irq(lock)
+#define local_spin_unlock_irq(lvar, lock)	spin_unlock_irq(lock)
+#define local_spin_lock_irqsave(lvar, lock, flags)	\
+	spin_lock_irqsave(lock, flags)
+#define local_spin_unlock_irqrestore(lvar, lock, flags)	\
+	spin_unlock_irqrestore(lock, flags)
+
+#define get_locked_var(lvar, var)		get_cpu_var(var)
+#define put_locked_var(lvar, var)		put_cpu_var(var)
+
+#define local_lock_cpu(lvar)			get_cpu()
+#define local_unlock_cpu(lvar)			put_cpu()
+
+#endif
-- 
2.20.1