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-zlib.m4

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    1 dnl #
    2 dnl # 2.6.39 API compat,
    3 dnl
    4 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
    5 dnl # This was done to avoid always having to allocate the maximum size
    6 dnl # workspace (268K).  The caller can now specific the windowBits and
    7 dnl # memLevel compression parameters to get a smaller workspace.
    8 dnl #
    9 AC_DEFUN([ZFS_AC_KERNEL_SRC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE], [
   10         ZFS_LINUX_TEST_SRC([2args_zlib_deflate_workspacesize], [
   11                 #include <linux/zlib.h>
   12         ],[
   13                 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
   14         ])
   15 ])
   16 
   17 AC_DEFUN([ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE], [
   18         AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
   19         ZFS_LINUX_TEST_RESULT([2args_zlib_deflate_workspacesize], [
   20                 AC_MSG_RESULT(yes)
   21                 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
   22                     [zlib_deflate_workspacesize() wants 2 args])
   23         ],[
   24                 ZFS_LINUX_TEST_ERROR([zlib_deflate_workspacesize()])
   25         ])
   26 ])

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