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Linux 6.11: first arg to proc_handler is now const 

Detect it, and use a macro to make sure we always match the prototype.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://despairlabs.com/sponsor/
Closes #16400
This commit is contained in:
Rob Norris 2024-07-31 12:15:07 +10:00 committed by Brian Behlendorf
parent 7e98d30f46
commit 22619523f6
3 changed files with 44 additions and 3 deletions
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33
config/kernel-register_sysctl_table.m4
View File

@ -25,3 +25,36 @@ AC_DEFUN([ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE], [
AC_MSG_RESULT([no])
])
])
dnl #
dnl # Linux 6.11 makes const the ctl_table arg of proc_handler
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_PROC_HANDLER_CTL_TABLE_CONST], [
ZFS_LINUX_TEST_SRC([has_proc_handler_ctl_table_const], [
#include <linux/sysctl.h>
static int test_handler(
const struct ctl_table *ctl __attribute((unused)),
int write __attribute((unused)),
void *buffer __attribute((unused)),
size_t *lenp __attribute((unused)),
loff_t *ppos __attribute((unused)))
{
return (0);
}
], [
proc_handler *ph __attribute((unused)) =
&test_handler;
])
])
AC_DEFUN([ZFS_AC_KERNEL_PROC_HANDLER_CTL_TABLE_CONST], [
AC_MSG_CHECKING([whether proc_handler ctl_table arg is const])
ZFS_LINUX_TEST_RESULT([has_proc_handler_ctl_table_const], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_PROC_HANDLER_CTL_TABLE_CONST, 1,
[proc_handler ctl_table arg is const])
], [
AC_MSG_RESULT([no])
])
])

2
config/kernel.m4
View File

@ -167,6 +167,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_WRITEPAGE_T
ZFS_AC_KERNEL_SRC_RECLAIMED
ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
ZFS_AC_KERNEL_SRC_PROC_HANDLER_CTL_TABLE_CONST
ZFS_AC_KERNEL_SRC_COPY_SPLICE_READ
ZFS_AC_KERNEL_SRC_SYNC_BDEV
ZFS_AC_KERNEL_SRC_MM_PAGE_SIZE
@ -319,6 +320,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_WRITEPAGE_T
ZFS_AC_KERNEL_RECLAIMED
ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
ZFS_AC_KERNEL_PROC_HANDLER_CTL_TABLE_CONST
ZFS_AC_KERNEL_COPY_SPLICE_READ
ZFS_AC_KERNEL_SYNC_BDEV
ZFS_AC_KERNEL_MM_PAGE_SIZE

12
module/os/linux/spl/spl-proc.c
View File

@ -43,6 +43,12 @@ typedef struct ctl_table __no_const spl_ctl_table;
typedef struct ctl_table spl_ctl_table;
#endif
#ifdef HAVE_PROC_HANDLER_CTL_TABLE_CONST
#define CONST_CTL_TABLE const struct ctl_table
#else
#define CONST_CTL_TABLE struct ctl_table
#endif
static unsigned long table_min = 0;
static unsigned long table_max = ~0;
@ -60,7 +66,7 @@ struct proc_dir_entry *proc_spl_kstat = NULL;
#ifdef DEBUG_KMEM
static int
proc_domemused(struct ctl_table *table, int write,
proc_domemused(CONST_CTL_TABLE *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int rc = 0;
@ -88,7 +94,7 @@ proc_domemused(struct ctl_table *table, int write,
#endif /* DEBUG_KMEM */
static int
proc_doslab(struct ctl_table *table, int write,
proc_doslab(CONST_CTL_TABLE *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int rc = 0;
@ -135,7 +141,7 @@ proc_doslab(struct ctl_table *table, int write,
}
static int
proc_dohostid(struct ctl_table *table, int write,
proc_dohostid(CONST_CTL_TABLE *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
char *end, str[32];