25 lines
640 B
Text
25 lines
640 B
Text
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dnl #
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dnl # 2.6.36 API change,
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dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
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dnl # a spinlock_t to improve the fastpath performance.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_FS_STRUCT_SPINLOCK], [
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AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Werror"
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/sched.h>
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#include <linux/fs_struct.h>
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],[
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static struct fs_struct fs;
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spin_lock_init(&fs.lock);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
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[struct fs_struct uses spinlock_t])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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