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Linux 4.8 compat: rw_semaphore atomic_long_t count

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For non-rwsem-spinlocks the "count" member was changed from a
"long" to "atomic_long_t" type.  A configure check has been
added to detect this change along with new versions of the
_rwsem_tryupgrade() function and RWSEM_COUNT() macro.  See
https://github.com/torvalds/linux/commit/8ee62b18 for complete
details.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #563
This commit is contained in:
Brian Behlendorf
2016-07-26 23:37:46 +00:00
parent d2f97b2a26
commit b7c7008ba2
3 changed files with 41 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/rwsem_compat.h
+5 -2
View File
@@ -35,9 +35,12 @@
#define SPL_RWSEM_SINGLE_WRITER_VALUE (RWSEM_ACTIVE_WRITE_BIAS)
#endif
/* Linux 3.16 change activity to count for rwsem-spinlock */
#ifdef HAVE_RWSEM_ACTIVITY
/* Linux 3.16 changed activity to count for rwsem-spinlock */
#if defined(HAVE_RWSEM_ACTIVITY)
#define RWSEM_COUNT(sem) sem->activity
/* Linux 4.8 changed count to an atomic_long_t for !rwsem-spinlock */
#elif defined(HAVE_RWSEM_ATOMIC_LONG_COUNT)
#define RWSEM_COUNT(sem) atomic_long_read(&(sem)->count)
#else
#define RWSEM_COUNT(sem) sem->count
#endif