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-readpages.m4

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    1 dnl #
    2 dnl # Linux 5.18 removes address_space_operations ->readpages in favour of
    3 dnl # ->readahead
    4 dnl #
    5 AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_READPAGES], [
    6         ZFS_LINUX_TEST_SRC([vfs_has_readpages], [
    7                 #include <linux/fs.h>
    8 
    9                 static const struct address_space_operations
   10                     aops __attribute__ ((unused)) = {
   11                         .readpages = NULL,
   12                 };
   13         ],[])
   14 ])
   15 
   16 AC_DEFUN([ZFS_AC_KERNEL_VFS_READPAGES], [
   17         AC_MSG_CHECKING([whether aops->readpages exists])
   18         ZFS_LINUX_TEST_RESULT([vfs_has_readpages], [
   19                 AC_MSG_RESULT([yes])
   20                 AC_DEFINE(HAVE_VFS_READPAGES, 1,
   21                         [address_space_operations->readpages exists])
   22         ],[
   23                 AC_MSG_RESULT([no])
   24         ])
   25 ])

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