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scst/include/backport.h: Improve the percpu-refcount backport further

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@9042 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2020-07-05 02:26:59 +00:00
parent 30b8e13581
commit 4b5d66239e
1 changed files with 26 additions and 15 deletions
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41
scst/include/backport.h
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@@ -192,7 +192,7 @@ static inline void *bsg_job_sense(struct bsg_job *job)
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0) && \
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \
RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 8)
RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 5)
static inline void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len)
{
int i;
@@ -1143,25 +1143,33 @@ static inline int pcie_capability_read_dword(struct pci_dev *dev, int pos,
#define PERCPU_COUNT_BIAS (1U << 31)
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) && \
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7)
typedef unsigned percpu_count_t;
#define READ_REF_COUNT(ref) atomic_read(&(ref)->count)
#else
typedef unsigned long percpu_count_t;
#define READ_REF_COUNT(ref) atomic_long_read(&(ref)->count)
#endif
#if !(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) && \
/*
* For kernel versions that have <linux/percpu-refcount.h>, backport the
* functionality that is missing from that header file.
*/
#if (defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) || \
LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0) && \
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \
RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 7)
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8)
/*
* See also commit 18c9a6bbe064 ("percpu-refcount: Introduce
* percpu_ref_resurrect()") # v4.20.
*/
static inline void percpu_ref_resurrect(struct percpu_ref *ref)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0) || \
(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7)
percpu_ref_reinit(ref);
#else
unsigned __percpu *pcpu_count = (unsigned __percpu *)
@@ -1187,6 +1195,7 @@ static inline void percpu_ref_resurrect(struct percpu_ref *ref)
#endif
}
#if !(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
/*
* See also commit 4c907baf36d8 ("percpu_ref: implement percpu_ref_is_dying()")
@@ -1206,10 +1215,12 @@ static inline bool percpu_ref_is_dying(struct percpu_ref *ref)
return ref->percpu_count_ptr & __PERCPU_REF_DEAD;
}
#endif
#endif /* !(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) */
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0) */
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) && \
!(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7)
/*
* See also commit 2aad2a86f668 ("percpu_ref: add PERCPU_REF_INIT_* flags")
* # v3.18.
@@ -1245,7 +1256,8 @@ static inline bool __ref_is_percpu(struct percpu_ref *ref,
}
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) */
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0) && \
!(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7)
/*
* See also commit 2d7227828e14 ("percpu-refcount: implement percpu_ref_reinit()
* and percpu_ref_is_zero()") # v3.17.
@@ -1263,7 +1275,8 @@ static inline void percpu_ref_exit(struct percpu_ref *ref)
}
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0) */
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) && \
!(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7)
static inline bool percpu_ref_tryget_live(struct percpu_ref *ref)
{
percpu_count_t __percpu *percpu_count;
@@ -1284,7 +1297,9 @@ static inline bool percpu_ref_tryget_live(struct percpu_ref *ref)
}
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) */
#elif LINUX_VERSION_CODE < KERNEL_VERSION(3, 11, 0)
#elif LINUX_VERSION_CODE < KERNEL_VERSION(3, 11, 0) && \
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \
RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 5)
struct percpu_ref;
typedef void (percpu_ref_func_t)(struct percpu_ref *);
@@ -1373,11 +1388,7 @@ static inline unsigned long percpu_ref_read(struct percpu_ref *ref)
/* Do not try to read the counter if it is in per-cpu mode. */
if (__ref_is_percpu(ref, &percpu_count))
return 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
return atomic_read(&ref->count) - !percpu_ref_is_dying(ref);
#else
return atomic_long_read(&ref->count) - !percpu_ref_is_dying(ref);
#endif
return READ_REF_COUNT(ref) - !percpu_ref_is_dying(ref);
}
/* <linux/preempt.h> */