1 AC_DEFUN([SPL_AC_SHRINKER_CALLBACK],[
2 tmp_flags="$EXTRA_KCFLAGS"
3 EXTRA_KCFLAGS="-Werror"
5 dnl # 2.6.23 to 2.6.34 API change
6 dnl # ->shrink(int nr_to_scan, gfp_t gfp_mask)
8 AC_MSG_CHECKING([whether old 2-argument shrinker exists])
9 SPL_LINUX_TRY_COMPILE([
12 int shrinker_cb(int nr_to_scan, gfp_t gfp_mask);
14 struct shrinker cache_shrinker = {
15 .shrink = shrinker_cb,
16 .seeks = DEFAULT_SEEKS,
18 register_shrinker(&cache_shrinker);
21 AC_DEFINE(HAVE_2ARGS_OLD_SHRINKER_CALLBACK, 1,
22 [old shrinker callback wants 2 args])
26 dnl # 2.6.35 - 2.6.39 API change
27 dnl # ->shrink(struct shrinker *,
28 dnl # int nr_to_scan, gfp_t gfp_mask)
30 AC_MSG_CHECKING([whether old 3-argument shrinker exists])
31 SPL_LINUX_TRY_COMPILE([
34 int shrinker_cb(struct shrinker *, int nr_to_scan,
37 struct shrinker cache_shrinker = {
38 .shrink = shrinker_cb,
39 .seeks = DEFAULT_SEEKS,
41 register_shrinker(&cache_shrinker);
44 AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
45 [old shrinker callback wants 3 args])
49 dnl # 3.0 - 3.11 API change
50 dnl # ->shrink(struct shrinker *,
51 dnl # struct shrink_control *sc)
54 [whether new 2-argument shrinker exists])
55 SPL_LINUX_TRY_COMPILE([
58 int shrinker_cb(struct shrinker *,
59 struct shrink_control *sc);
61 struct shrinker cache_shrinker = {
62 .shrink = shrinker_cb,
63 .seeks = DEFAULT_SEEKS,
65 register_shrinker(&cache_shrinker);
68 AC_DEFINE(HAVE_2ARGS_NEW_SHRINKER_CALLBACK, 1,
69 [new shrinker callback wants 2 args])
73 dnl # 3.12 API change,
74 dnl # ->shrink() is logically split in to
75 dnl # ->count_objects() and ->scan_objects()
78 [whether ->count_objects callback exists])
79 SPL_LINUX_TRY_COMPILE([
82 unsigned long shrinker_cb(
84 struct shrink_control *sc);
86 struct shrinker cache_shrinker = {
87 .count_objects = shrinker_cb,
88 .scan_objects = shrinker_cb,
89 .seeks = DEFAULT_SEEKS,
91 register_shrinker(&cache_shrinker);
94 AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
95 1, [->count_objects exists])
102 EXTRA_KCFLAGS="$tmp_flags"
106 dnl # 2.6.39 API change,
107 dnl # Shrinker adjust to use common shrink_control structure.
109 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
110 AC_MSG_CHECKING([whether struct shrink_control exists])
111 SPL_LINUX_TRY_COMPILE([
112 #include <linux/mm.h>
114 struct shrink_control sc __attribute__ ((unused));
117 sc.gfp_mask = GFP_KERNEL;
120 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
121 [struct shrink_control exists])