126 lines
3.0 KiB
Plaintext
126 lines
3.0 KiB
Plaintext
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AC_DEFUN([SPL_AC_SHRINKER_CALLBACK],[
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Werror"
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dnl #
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dnl # 2.6.23 to 2.6.34 API change
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dnl # ->shrink(int nr_to_scan, gfp_t gfp_mask)
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dnl #
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AC_MSG_CHECKING([whether old 2-argument shrinker exists])
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SPL_LINUX_TRY_COMPILE([
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#include <linux/mm.h>
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int shrinker_cb(int nr_to_scan, gfp_t gfp_mask);
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],[
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struct shrinker cache_shrinker = {
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.shrink = shrinker_cb,
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.seeks = DEFAULT_SEEKS,
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};
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register_shrinker(&cache_shrinker);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_2ARGS_OLD_SHRINKER_CALLBACK, 1,
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[old shrinker callback wants 2 args])
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],[
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AC_MSG_RESULT(no)
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dnl #
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dnl # 2.6.35 - 2.6.39 API change
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dnl # ->shrink(struct shrinker *,
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dnl # int nr_to_scan, gfp_t gfp_mask)
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dnl #
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AC_MSG_CHECKING([whether old 3-argument shrinker exists])
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SPL_LINUX_TRY_COMPILE([
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#include <linux/mm.h>
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int shrinker_cb(struct shrinker *, int nr_to_scan,
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gfp_t gfp_mask);
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],[
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struct shrinker cache_shrinker = {
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.shrink = shrinker_cb,
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.seeks = DEFAULT_SEEKS,
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};
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register_shrinker(&cache_shrinker);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
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[old shrinker callback wants 3 args])
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],[
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AC_MSG_RESULT(no)
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dnl #
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dnl # 3.0 - 3.11 API change
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dnl # ->shrink(struct shrinker *,
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dnl # struct shrink_control *sc)
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dnl #
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AC_MSG_CHECKING(
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[whether new 2-argument shrinker exists])
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SPL_LINUX_TRY_COMPILE([
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#include <linux/mm.h>
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int shrinker_cb(struct shrinker *,
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struct shrink_control *sc);
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],[
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struct shrinker cache_shrinker = {
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.shrink = shrinker_cb,
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.seeks = DEFAULT_SEEKS,
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};
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register_shrinker(&cache_shrinker);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_2ARGS_NEW_SHRINKER_CALLBACK, 1,
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[new shrinker callback wants 2 args])
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],[
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AC_MSG_RESULT(no)
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dnl #
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dnl # 3.12 API change,
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dnl # ->shrink() is logically split in to
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dnl # ->count_objects() and ->scan_objects()
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dnl #
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AC_MSG_CHECKING(
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[whether ->count_objects callback exists])
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SPL_LINUX_TRY_COMPILE([
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#include <linux/mm.h>
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unsigned long shrinker_cb(
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struct shrinker *,
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struct shrink_control *sc);
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],[
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struct shrinker cache_shrinker = {
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.count_objects = shrinker_cb,
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.scan_objects = shrinker_cb,
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.seeks = DEFAULT_SEEKS,
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};
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register_shrinker(&cache_shrinker);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
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1, [->count_objects exists])
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],[
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AC_MSG_ERROR(error)
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])
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])
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])
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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dnl #
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dnl # 2.6.39 API change,
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dnl # Shrinker adjust to use common shrink_control structure.
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dnl #
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AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
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AC_MSG_CHECKING([whether struct shrink_control exists])
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SPL_LINUX_TRY_COMPILE([
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#include <linux/mm.h>
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],[
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struct shrink_control sc __attribute__ ((unused));
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sc.nr_to_scan = 0;
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sc.gfp_mask = GFP_KERNEL;
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
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[struct shrink_control exists])
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],[
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AC_MSG_RESULT(no)
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])
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])
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