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scst/include/backport.h: Add kfree_rcu() definition for kernels < 3.0

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@6730 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2015-12-11 05:52:45 +00:00
parent 1099848397
commit 2b4abe603a
1 changed files with 15 additions and 0 deletions
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scst/include/backport.h
+15
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@@ -365,6 +365,21 @@ static inline __attribute__ ((format (printf, 1, 2)))
int no_printk(const char *s, ...) { return 0; }
#endif
/* <linux/rcupdate.h> */
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 0, 0)
typedef void (*rcu_callback_t)(struct rcu_head *);
#define __is_kfree_rcu_offset(offset) ((offset) < 4096)
#define kfree_call_rcu(head, rcb) call_rcu(head, rcb)
#define __kfree_rcu(head, offset) \
do { \
BUILD_BUG_ON(!__is_kfree_rcu_offset(offset)); \
kfree_call_rcu(head, (rcu_callback_t)(unsigned long)(offset)); \
} while (0)
#define kfree_rcu(ptr, rcu_head) \
__kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head))
#endif
/* <linux/sched.h> */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26) && \