Linux 2.6.39 compat, zlib_deflate_workspacesize()

[mirror_spl.git] / config / spl-build.m4

diff --git a/config/spl-build.m4 b/config/spl-build.m4
index 13c68358b18a2282977d38648c7c6a08a6e0a6f7..97b38234bcb95cbdd6c1051f8c574741db7a1677 100644 (file)
--- a/config/spl-build.m4
+++ b/config/spl-build.m4
@@ -80,6 +80,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
        SPL_AC_SHRINK_DCACHE_MEMORY
        SPL_AC_SHRINK_ICACHE_MEMORY
        SPL_AC_KERN_PATH_PARENT
+       SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
 ])
 
 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
@@ -1802,3 +1803,25 @@ AC_DEFUN([SPL_AC_KERN_PATH_PARENT], [
                [kern_path_parent() is available])],
                [])
 ])
+
+dnl #
+dnl # 2.6.39 API compat,
+dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
+dnl # This was done to avoid always having to allocate the maximum size
+dnl # workspace (268K).  The caller can now specific the windowBits and
+dnl # memLevel compression parameters to get a smaller workspace.
+dnl #
+AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
+       [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/zlib.h>
+       ],[
+               return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
+                         [zlib_deflate_workspacesize() wants 2 args])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])