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authorFrederic Weisbecker <fweisbec@gmail.com>2013-02-05 03:48:46 +0400
committerFrederic Weisbecker <fweisbec@gmail.com>2013-02-05 03:48:46 +0400
commit077931446b85e7858bf9dc0927cd116669b965d2 (patch)
tree02fbdf4a42b30b841a61aca399bd0ac6a5c308e6 /include/linux/irq_work.h
parentf7c819c020db9796ae3a662b82a310617f92b15b (diff)
parent74876a98a87a115254b3a66a14b27320b7f0acaa (diff)
downloadlinux-077931446b85e7858bf9dc0927cd116669b965d2.tar.xz
Merge branch 'nohz/printk-v8' into irq/core
Conflicts: kernel/irq_work.c Add support for printk in full dynticks CPU. * Don't stop tick with irq works pending. This fix is generally useful and concerns archs that can't raise self IPIs. * Flush irq works before CPU offlining. * Introduce "lazy" irq works that can wait for the next tick to be executed, unless it's stopped. * Implement klogd wake up using irq work. This removes the ad-hoc printk_tick()/printk_needs_cpu() hooks and make it working even in dynticks mode. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'include/linux/irq_work.h')
-rw-r--r--include/linux/irq_work.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
index ce60c084635b..f5dbce50466e 100644
--- a/include/linux/irq_work.h
+++ b/include/linux/irq_work.h
@@ -3,6 +3,20 @@
#include <linux/llist.h>
+/*
+ * An entry can be in one of four states:
+ *
+ * free NULL, 0 -> {claimed} : free to be used
+ * claimed NULL, 3 -> {pending} : claimed to be enqueued
+ * pending next, 3 -> {busy} : queued, pending callback
+ * busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed
+ */
+
+#define IRQ_WORK_PENDING 1UL
+#define IRQ_WORK_BUSY 2UL
+#define IRQ_WORK_FLAGS 3UL
+#define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */
+
struct irq_work {
unsigned long flags;
struct llist_node llnode;
@@ -20,4 +34,10 @@ void irq_work_queue(struct irq_work *work);
void irq_work_run(void);
void irq_work_sync(struct irq_work *work);
+#ifdef CONFIG_IRQ_WORK
+bool irq_work_needs_cpu(void);
+#else
+static bool irq_work_needs_cpu(void) { return false; }
+#endif
+
#endif /* _LINUX_IRQ_WORK_H */