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linux 6.7 compat: rework shrinker setup for heap allocations

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6.7 changes the shrinker API such that shrinkers must be allocated
dynamically by the kernel. To accomodate this, this commit reworks
spl_register_shrinker() to do something similar against earlier kernels.

Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://github.com/sponsors/robn
(cherry picked from commit 03b84099d9)
This commit is contained in:
Rob Norris
2023-12-17 00:36:21 +11:00
committed by Tony Hutter
parent 72bf91dfdb
commit 5f465d1515
5 changed files with 189 additions and 56 deletions
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config/kernel-shrink.m4
+47 -5
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@@ -128,6 +128,25 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK], [
])
])
dnl #
dnl # 6.7 API change
dnl # register_shrinker has been replaced by shrinker_register.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER_REGISTER], [
ZFS_LINUX_TEST_SRC([shrinker_register], [
#include <linux/shrinker.h>
unsigned long shrinker_cb(struct shrinker *shrink,
struct shrink_control *sc) { return 0; }
],[
struct shrinker cache_shrinker = {
.count_objects = shrinker_cb,
.scan_objects = shrinker_cb,
.seeks = DEFAULT_SEEKS,
};
shrinker_register(&cache_shrinker);
])
])
AC_DEFUN([ZFS_AC_KERNEL_SHRINKER_CALLBACK],[
dnl #
dnl # 6.0 API change
@@ -165,14 +184,36 @@ AC_DEFUN([ZFS_AC_KERNEL_SHRINKER_CALLBACK],[
dnl # cs->shrink() is logically split in to
dnl # cs->count_objects() and cs->scan_objects()
dnl #
AC_MSG_CHECKING([if cs->count_objects callback exists])
AC_MSG_CHECKING(
[whether cs->count_objects callback exists])
ZFS_LINUX_TEST_RESULT(
[shrinker_cb_shrink_control_split],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK, 1,
[cs->count_objects exists])
[shrinker_cb_shrink_control_split],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK, 1,
[cs->count_objects exists])
],[
AC_MSG_RESULT(no)
AC_MSG_CHECKING(
[whether shrinker_register exists])
ZFS_LINUX_TEST_RESULT([shrinker_register], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SHRINKER_REGISTER, 1,
[shrinker_register exists])
dnl # We assume that the split shrinker
dnl # callback exists if
dnl # shrinker_register() exists,
dnl # because the latter is a much more
dnl # recent addition, and the macro
dnl # test for shrinker_register() only
dnl # works if the callback is split
AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
1, [cs->count_objects exists])
],[
AC_MSG_RESULT(no)
ZFS_LINUX_TEST_ERROR([shrinker])
])
])
])
])
@@ -211,6 +252,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER], [
ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK
ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_STRUCT
ZFS_AC_KERNEL_SRC_REGISTER_SHRINKER_VARARG
ZFS_AC_KERNEL_SRC_SHRINKER_REGISTER
])
AC_DEFUN([ZFS_AC_KERNEL_SHRINKER], [