These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / block / zram / zram_drv.h

diff --git a/kernel/drivers/block/zram/zram_drv.h b/kernel/drivers/block/zram/zram_drv.h
index 570c598..9e3e953 100644 (file)
--- a/kernel/drivers/block/zram/zram_drv.h
+++ b/kernel/drivers/block/zram/zram_drv.h
@@ -20,12 +20,6 @@
 
 #include "zcomp.h"
 
-/*
- * Some arbitrary value. This is just to catch
- * invalid value for num_devices module parameter.
- */
-static const unsigned max_num_devices = 32;
-
 /*-- Configurable parameters */
 
 /*
@@ -78,13 +72,15 @@ enum zram_pageflags {
 struct zram_table_entry {
        unsigned long handle;
        unsigned long value;
+#ifdef CONFIG_PREEMPT_RT_BASE
+       spinlock_t lock;
+#endif
 };
 
 struct zram_stats {
        atomic64_t compr_data_size;     /* compressed size of pages stored */
        atomic64_t num_reads;   /* failed + successful */
        atomic64_t num_writes;  /* --do-- */
-       atomic64_t num_migrated;        /* no. of migrated object */
        atomic64_t failed_reads;        /* can happen when memory is too low */
        atomic64_t failed_writes;       /* can happen when memory is too low */
        atomic64_t invalid_io;  /* non-page-aligned I/O requests */
@@ -121,5 +117,47 @@ struct zram {
         */
        u64 disksize;   /* bytes */
        char compressor[10];
+       /*
+        * zram is claimed so open request will be failed
+        */
+       bool claim; /* Protected by bdev->bd_mutex */
 };
+
+#ifndef CONFIG_PREEMPT_RT_BASE
+static inline void zram_lock_table(struct zram_table_entry *table)
+{
+       bit_spin_lock(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_unlock_table(struct zram_table_entry *table)
+{
+       bit_spin_unlock(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize) { }
+#else /* CONFIG_PREEMPT_RT_BASE */
+static inline void zram_lock_table(struct zram_table_entry *table)
+{
+       spin_lock(&table->lock);
+       __set_bit(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_unlock_table(struct zram_table_entry *table)
+{
+       __clear_bit(ZRAM_ACCESS, &table->value);
+       spin_unlock(&table->lock);
+}
+
+static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize)
+{
+        size_t num_pages = disksize >> PAGE_SHIFT;
+        size_t index;
+
+        for (index = 0; index < num_pages; index++) {
+               spinlock_t *lock = &meta->table[index].lock;
+               spin_lock_init(lock);
+        }
+}
+#endif /* CONFIG_PREEMPT_RT_BASE */
+
 #endif