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Linux 6.0 compat: register_shrinker() now var-arg 

The 6.0 kernel added a printf-style var-arg for args > 0 to the
register_shrinker function, in order to add names to shrinkers, in
commit e33c267ab70de4249d22d7eab1cc7d68a889bac2. This enables the
shrinkers to have friendly names exposed in /sys/kernel/debug/shrinker/.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #13748
This commit is contained in:
Coleman Kane 2022-08-08 19:18:30 -04:00 committed by Brian Behlendorf
parent 4063d7b6b4
commit e0dbab1a14
2 changed files with 56 additions and 15 deletions
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67
config/kernel-shrink.m4
View File

@ -54,6 +54,21 @@ AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID], [
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_REGISTER_SHRINKER_VARARG], [
ZFS_LINUX_TEST_SRC([register_shrinker_vararg], [
#include <linux/mm.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,
};
register_shrinker(&cache_shrinker, "vararg-reg-shrink-test");
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK], [
ZFS_LINUX_TEST_SRC([shrinker_cb_shrink_control], [
#include <linux/mm.h>
@ -83,29 +98,50 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK], [
AC_DEFUN([ZFS_AC_KERNEL_SHRINKER_CALLBACK],[
dnl #
dnl # 3.0 - 3.11 API change
dnl # cs->shrink(struct shrinker *, struct shrink_control *sc)
dnl # 6.0 API change
dnl # register_shrinker() becomes a var-arg function that takes
dnl # a printf-style format string as args > 0
dnl #
AC_MSG_CHECKING([whether new 2-argument shrinker exists])
ZFS_LINUX_TEST_RESULT([shrinker_cb_shrink_control], [
AC_MSG_CHECKING([whether new var-arg register_shrinker() exists])
ZFS_LINUX_TEST_RESULT([register_shrinker_vararg], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SINGLE_SHRINKER_CALLBACK, 1,
[new shrinker callback wants 2 args])
AC_DEFINE(HAVE_REGISTER_SHRINKER_VARARG, 1,
[register_shrinker is vararg])
dnl # We assume that the split shrinker callback exists if the
dnl # vararg register_shrinker() exists, because the latter is
dnl # a much more recent addition, and the macro test for the
dnl # var-arg version only works if the callback is split
AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK, 1,
[cs->count_objects exists])
],[
AC_MSG_RESULT(no)
dnl #
dnl # 3.12 API change,
dnl # cs->shrink() is logically split in to
dnl # cs->count_objects() and cs->scan_objects()
dnl # 3.0 - 3.11 API change
dnl # cs->shrink(struct shrinker *, struct shrink_control *sc)
dnl #
AC_MSG_CHECKING([whether cs->count_objects callback exists])
ZFS_LINUX_TEST_RESULT([shrinker_cb_shrink_control_split], [
AC_MSG_CHECKING([whether new 2-argument shrinker exists])
ZFS_LINUX_TEST_RESULT([shrinker_cb_shrink_control], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK, 1,
[cs->count_objects exists])
AC_DEFINE(HAVE_SINGLE_SHRINKER_CALLBACK, 1,
[new shrinker callback wants 2 args])
],[
ZFS_LINUX_TEST_ERROR([shrinker])
AC_MSG_RESULT(no)
dnl #
dnl # 3.12 API change,
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])
ZFS_LINUX_TEST_RESULT(
[shrinker_cb_shrink_control_split],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK, 1,
[cs->count_objects exists])
],[
ZFS_LINUX_TEST_ERROR([shrinker])
])
])
])
])
@ -141,6 +177,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER], [
ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_HAS_NID
ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK
ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_STRUCT
ZFS_AC_KERNEL_SRC_REGISTER_SHRINKER_VARARG
])
AC_DEFUN([ZFS_AC_KERNEL_SHRINKER], [

4
include/os/linux/spl/sys/shrinker.h
View File

@ -64,7 +64,11 @@
* }
*/
#ifdef HAVE_REGISTER_SHRINKER_VARARG
#define spl_register_shrinker(x) register_shrinker(x, "zfs-arc-shrinker")
#else
#define spl_register_shrinker(x) register_shrinker(x)
#endif
#define spl_unregister_shrinker(x) unregister_shrinker(x)
/*