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Use refcount_dec_and_test() on 4.16+ kernels, atomic_dec_and_test() on older kernels. https://lwn.net/Articles/714974/ Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Closes: #7179 Closes: #7211
21 lines
556 B
Plaintext
21 lines
556 B
Plaintext
dnl #
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dnl # 4.16 kernel: check if struct posix_acl acl.a_refcount is a refcount_t.
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dnl # It's an atomic_t on older kernels.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_ACL_HAS_REFCOUNT], [
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AC_MSG_CHECKING([whether posix_acl has refcount_t])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/backing-dev.h>
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#include <linux/refcount.h>
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#include <linux/posix_acl.h>
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],[
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struct posix_acl acl;
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refcount_t *r __attribute__ ((unused)) = &acl.a_refcount;
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_ACL_REFCOUNT, 1, [posix_acl has refcount_t])
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],[
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AC_MSG_RESULT(no)
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])
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])
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