The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/config/kernel-generic_fadvise.m4

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    1 dnl #
    2 dnl # 5.3 API change
    3 dnl # The generic_fadvise() function is present since 4.19 kernel
    4 dnl # but it was not exported until Linux 5.3.
    5 dnl #
    6 AC_DEFUN([ZFS_AC_KERNEL_SRC_GENERIC_FADVISE], [
    7         ZFS_LINUX_TEST_SRC([generic_fadvise], [
    8                 #include <linux/fs.h>
    9         ], [
   10                 struct file *fp __attribute__ ((unused)) = NULL;
   11                 loff_t offset __attribute__ ((unused)) = 0;
   12                 loff_t len __attribute__ ((unused)) = 0;
   13                 int advise __attribute__ ((unused)) = 0;
   14                 generic_fadvise(fp, offset, len, advise);
   15         ])
   16 ])
   17 
   18 AC_DEFUN([ZFS_AC_KERNEL_GENERIC_FADVISE], [
   19         AC_MSG_CHECKING([whether generic_fadvise() is available])
   20         ZFS_LINUX_TEST_RESULT_SYMBOL([generic_fadvise],
   21         [generic_fadvise], [mm/fadvise.c], [
   22                 AC_MSG_RESULT(yes)
   23                 AC_DEFINE(HAVE_GENERIC_FADVISE, 1, [yes])
   24         ],[
   25                 AC_MSG_RESULT(no)
   26         ])
   27 ])

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