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Linux 6.5 compat: register_sysctl_table removed

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Additionally, the .child element of ctl_table has been removed in 6.5.
This change adds a new test for the pre-6.5 register_sysctl_table()
function, and uses the old code in that case. If it isn't found, then
the parentage entries in the tables are removed, and the register_sysctl
call is provided the paths of "kernel/spl", "kernel/spl/kmem", and
"kernel/spl/kstat" directly, to populate each subdirectory over three
calls, as is the new API.

Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #15138
This commit is contained in:
Coleman Kane 2023-08-02 17:05:46 -04:00 committed by Brian Behlendorf
parent 3a68f3c50f
commit 31a4673c05
3 changed files with 52 additions and 3 deletions
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27
config/kernel-register_sysctl_table.m4 Normal file
View File

@ -0,0 +1,27 @@
dnl #
dnl # Linux 6.5 removes register_sysctl_table
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE], [
ZFS_LINUX_TEST_SRC([has_register_sysctl_table], [
#include <linux/sysctl.h>
static struct ctl_table dummy_table[] = {
{}
};
],[
struct ctl_table_header *h
__attribute((unused)) = register_sysctl_table(dummy_table);
])
])
AC_DEFUN([ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE], [
AC_MSG_CHECKING([whether register_sysctl_table exists])
ZFS_LINUX_TEST_RESULT([has_register_sysctl_table], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_REGISTER_SYSCTL_TABLE, 1,
[register_sysctl_table exists])
],[
AC_MSG_RESULT([no])
])
])

2
config/kernel.m4
View File

@ -160,6 +160,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_FILEMAP
ZFS_AC_KERNEL_SRC_WRITEPAGE_T
ZFS_AC_KERNEL_SRC_RECLAIMED
ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
@ -299,6 +300,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_FILEMAP
ZFS_AC_KERNEL_WRITEPAGE_T
ZFS_AC_KERNEL_RECLAIMED
ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_CPU_HAS_FEATURE

20
module/os/linux/spl/spl-proc.c
View File

@ -624,6 +624,7 @@ static struct ctl_table spl_table[] = {
.mode = 0644,
.proc_handler = &proc_dohostid,
},
#ifdef HAVE_REGISTER_SYSCTL_TABLE
{
.procname = "kmem",
.mode = 0555,
@ -634,9 +635,11 @@ static struct ctl_table spl_table[] = {
.mode = 0555,
.child = spl_kstat_table,
},
#endif
{},
};
#ifdef HAVE_REGISTER_SYSCTL_TABLE
static struct ctl_table spl_dir[] = {
{
.procname = "spl",
@ -654,15 +657,32 @@ static struct ctl_table spl_root[] = {
},
{}
};
#endif
int
spl_proc_init(void)
{
int rc = 0;
#ifdef HAVE_REGISTER_SYSCTL_TABLE
spl_header = register_sysctl_table(spl_root);
if (spl_header == NULL)
return (-EUNATCH);
#else
spl_header = register_sysctl("kernel/spl", spl_table);
if (spl_header == NULL)
return (-EUNATCH);
if (register_sysctl("kernel/spl/kmem", spl_kmem_table) == NULL) {
rc = -EUNATCH;
goto out;
}
if (register_sysctl("kernel/spl/kstat", spl_kstat_table) == NULL) {
rc = -EUNATCH;
goto out;
}
#endif
proc_spl = proc_mkdir("spl", NULL);
if (proc_spl == NULL) {