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scst: Backport the percpu-ref code to kernel version 3.17 and before

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8046 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2019-03-11 02:53:24 +00:00
parent b9969a09a5
commit a4c05a4b31
1 changed files with 35 additions and 1 deletions
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36
scst/include/backport.h
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@@ -872,8 +872,42 @@ static inline struct ib_pd *ib_alloc_pd_backport(struct ib_device *device)
#endif
/* <linux/percpu-refcount.h> */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0) || RHEL_MAJOR -0 >= 7
#if defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7
#include <linux/percpu-refcount.h>
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
#include <linux/percpu-refcount.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
/*
* See also commit 2aad2a86f668 ("percpu_ref: add PERCPU_REF_INIT_* flags")
* # v3.18.
*/
static inline int __must_check percpu_ref_init_backport(struct percpu_ref *ref,
percpu_ref_func_t *release, unsigned int flags,
gfp_t gfp)
{
WARN_ON_ONCE(flags != 0);
WARN_ON_ONCE(gfp != GFP_KERNEL);
return percpu_ref_init(ref, release);
}
#define percpu_ref_init percpu_ref_init_backport
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0)
/*
* See also commit 2d7227828e14 ("percpu-refcount: implement percpu_ref_reinit()
* and percpu_ref_is_zero()") # v3.17.
*/
static inline bool percpu_ref_is_zero(struct percpu_ref *ref)
{
return !atomic_read(&ref->count);
}
/*
* See also commit 9a1049da9bd2 ("percpu-refcount: require percpu_ref to be
* exited explicitly") # v3.17.
*/
static inline void percpu_ref_exit(struct percpu_ref *ref)
{
}
#endif
#else
struct percpu_ref;
typedef void (percpu_ref_func_t)(struct percpu_ref *);