diff options
Diffstat (limited to 'config/kernel-rwsem.m4')
| -rw-r--r-- | config/kernel-rwsem.m4 | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/config/kernel-rwsem.m4 b/config/kernel-rwsem.m4 new file mode 100644 index 000000000..aee20ae90 --- /dev/null +++ b/config/kernel-rwsem.m4 @@ -0,0 +1,75 @@ +dnl # +dnl # 3.1 API Change +dnl # +dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to +dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1. +dnl # +AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [ + AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw]) + tmp_flags="$EXTRA_KCFLAGS" + EXTRA_KCFLAGS="-Werror" + SPL_LINUX_TRY_COMPILE([ + #include <linux/rwsem.h> + ],[ + struct rw_semaphore dummy_semaphore __attribute__ ((unused)); + raw_spinlock_t dummy_lock __attribute__ ((unused)) = + __RAW_SPIN_LOCK_INITIALIZER(dummy_lock); + dummy_semaphore.wait_lock = dummy_lock; + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1, + [struct rw_semaphore member wait_lock is raw_spinlock_t]) + ],[ + AC_MSG_RESULT(no) + ]) + EXTRA_KCFLAGS="$tmp_flags" +]) + +dnl # +dnl # 3.16 API Change +dnl # +dnl # rwsem-spinlock "->activity" changed to "->count" +dnl # +AC_DEFUN([SPL_AC_RWSEM_ACTIVITY], [ + AC_MSG_CHECKING([whether struct rw_semaphore has member activity]) + tmp_flags="$EXTRA_KCFLAGS" + EXTRA_KCFLAGS="-Werror" + SPL_LINUX_TRY_COMPILE([ + #include <linux/rwsem.h> + ],[ + struct rw_semaphore dummy_semaphore __attribute__ ((unused)); + dummy_semaphore.activity = 0; + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_RWSEM_ACTIVITY, 1, + [struct rw_semaphore has member activity]) + ],[ + AC_MSG_RESULT(no) + ]) + EXTRA_KCFLAGS="$tmp_flags" +]) + +dnl # +dnl # 4.8 API Change +dnl # +dnl # rwsem "->count" changed to atomic_long_t type +dnl # +AC_DEFUN([SPL_AC_RWSEM_ATOMIC_LONG_COUNT], [ + AC_MSG_CHECKING( + [whether struct rw_semaphore has atomic_long_t member count]) + tmp_flags="$EXTRA_KCFLAGS" + EXTRA_KCFLAGS="-Werror" + SPL_LINUX_TRY_COMPILE([ + #include <linux/rwsem.h> + ],[ + DECLARE_RWSEM(dummy_semaphore); + (void) atomic_long_read(&dummy_semaphore.count); + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_RWSEM_ATOMIC_LONG_COUNT, 1, + [struct rw_semaphore has atomic_long_t member count]) + ],[ + AC_MSG_RESULT(no) + ]) + EXTRA_KCFLAGS="$tmp_flags" +]) |