76 lines
1.9 KiB
Plaintext
76 lines
1.9 KiB
Plaintext
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dnl #
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dnl # 3.1 API Change
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dnl #
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dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
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dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
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dnl #
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AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
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AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Werror"
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SPL_LINUX_TRY_COMPILE([
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#include <linux/rwsem.h>
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],[
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struct rw_semaphore dummy_semaphore __attribute__ ((unused));
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raw_spinlock_t dummy_lock __attribute__ ((unused)) =
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__RAW_SPIN_LOCK_INITIALIZER(dummy_lock);
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dummy_semaphore.wait_lock = dummy_lock;
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
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[struct rw_semaphore member wait_lock is raw_spinlock_t])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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dnl #
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dnl # 3.16 API Change
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dnl #
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dnl # rwsem-spinlock "->activity" changed to "->count"
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dnl #
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AC_DEFUN([SPL_AC_RWSEM_ACTIVITY], [
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AC_MSG_CHECKING([whether struct rw_semaphore has member activity])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Werror"
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SPL_LINUX_TRY_COMPILE([
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#include <linux/rwsem.h>
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],[
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struct rw_semaphore dummy_semaphore __attribute__ ((unused));
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dummy_semaphore.activity = 0;
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_RWSEM_ACTIVITY, 1,
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[struct rw_semaphore has member activity])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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dnl #
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dnl # 4.8 API Change
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dnl #
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dnl # rwsem "->count" changed to atomic_long_t type
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dnl #
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AC_DEFUN([SPL_AC_RWSEM_ATOMIC_LONG_COUNT], [
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AC_MSG_CHECKING(
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[whether struct rw_semaphore has atomic_long_t member count])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Werror"
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SPL_LINUX_TRY_COMPILE([
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#include <linux/rwsem.h>
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],[
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DECLARE_RWSEM(dummy_semaphore);
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(void) atomic_long_read(&dummy_semaphore.count);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_RWSEM_ATOMIC_LONG_COUNT, 1,
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[struct rw_semaphore has atomic_long_t member count])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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