Index: sys/amd64/linux/linux_sysvec.c
===================================================================
--- sys/amd64/linux/linux_sysvec.c
+++ sys/amd64/linux/linux_sysvec.c
@@ -101,8 +101,8 @@
 static int	linux_fixup_elf(uintptr_t *stack_base,
 		    struct image_params *iparams);
 static bool	linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
-static void	linux_vdso_install(void *param);
-static void	linux_vdso_deinstall(void *param);
+static void	linux_vdso_install(const void *param);
+static void	linux_vdso_deinstall(const void *param);
 static void	linux_set_syscall_retval(struct thread *td, int error);
 static int	linux_fetch_syscall_args(struct thread *td);
 static void	linux_exec_setregs(struct thread *td, struct image_params *imgp,
@@ -786,7 +786,7 @@
 };
 
 static void
-linux_vdso_install(void *param)
+linux_vdso_install(const void *param)
 {
 
 	amd64_lower_shared_page(&elf_linux_sysvec);
@@ -815,7 +815,7 @@
     linux_vdso_install, NULL);
 
 static void
-linux_vdso_deinstall(void *param)
+linux_vdso_deinstall(const void *param)
 {
 
 	__elfN(linux_shared_page_fini)(linux_shared_page_obj,
Index: sys/amd64/linux32/linux32_sysvec.c
===================================================================
--- sys/amd64/linux32/linux32_sysvec.c
+++ sys/amd64/linux32/linux32_sysvec.c
@@ -110,8 +110,8 @@
 				   struct image_params *imgp, uintptr_t stack);
 static void	linux32_fixlimit(struct rlimit *rl, int which);
 static bool	linux32_trans_osrel(const Elf_Note *note, int32_t *osrel);
-static void	linux_vdso_install(void *param);
-static void	linux_vdso_deinstall(void *param);
+static void	linux_vdso_install(const void *param);
+static void	linux_vdso_deinstall(const void *param);
 static void	linux32_set_syscall_retval(struct thread *td, int error);
 
 #define LINUX_T_UNKNOWN  255
@@ -931,7 +931,7 @@
 };
 
 static void
-linux_vdso_install(void *param)
+linux_vdso_install(const void *param)
 {
 
 	linux_szsigcode = (&_binary_linux32_locore_o_end -
@@ -958,7 +958,7 @@
     linux_vdso_install, NULL);
 
 static void
-linux_vdso_deinstall(void *param)
+linux_vdso_deinstall(const void *param)
 {
 
 	__elfN(linux_shared_page_fini)(linux_shared_page_obj,
Index: sys/i386/linux/linux_sysvec.c
===================================================================
--- sys/i386/linux/linux_sysvec.c
+++ sys/i386/linux/linux_sysvec.c
@@ -97,8 +97,8 @@
 static int	linux_copyout_strings(struct image_params *imgp,
 		    uintptr_t *stack_base);
 static bool	linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
-static void	linux_vdso_install(void *param);
-static void	linux_vdso_deinstall(void *param);
+static void	linux_vdso_install(const void *param);
+static void	linux_vdso_deinstall(const void *param);
 
 static int linux_szplatform;
 const char *linux_kplatform;
@@ -911,7 +911,7 @@
 };
 
 static void
-linux_vdso_install(void *param)
+linux_vdso_install(const void *param)
 {
 
 	linux_szsigcode = (&_binary_linux_locore_o_end -
@@ -935,7 +935,7 @@
     linux_vdso_install, NULL);
 
 static void
-linux_vdso_deinstall(void *param)
+linux_vdso_deinstall(const void *param)
 {
 
 	__elfN(linux_shared_page_fini)(linux_shared_page_obj,