The branch stable/13 has been updated by trasz:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=95f24ec842b5ddb2dbfed16a256d0b5f6656516d

commit 95f24ec842b5ddb2dbfed16a256d0b5f6656516d
Author:     Edward Tomasz Napierala <[email protected]>
AuthorDate: 2021-07-13 09:52:13 +0000
Commit:     Edward Tomasz Napierala <[email protected]>
CommitDate: 2022-02-14 00:09:05 +0000

    linux(4): remove unfinished vsyscall bits on arm64
    
    The vsyscall mechanism is obsolete.
    
    Reviewed By:    dchagin, emaste
    Sponsored By:   EPSRC
    Differential Revision:  https://reviews.freebsd.org/D31091
    
    (cherry picked from commit 84a3963d5d94be05c913d04ea0cef4ac69a8bfc7)
---
 sys/arm64/linux/linux_sysvec.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/sys/arm64/linux/linux_sysvec.c b/sys/arm64/linux/linux_sysvec.c
index de8dd023f82d..7fe6ab781218 100644
--- a/sys/arm64/linux/linux_sysvec.c
+++ b/sys/arm64/linux/linux_sysvec.c
@@ -90,7 +90,6 @@ 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,
                    uintptr_t stack);
-static int     linux_vsyscall(struct thread *td);
 
 /* DTrace init */
 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
@@ -102,7 +101,6 @@ LIN_SDT_PROBE_DEFINE0(sysvec, linux_copyout_auxargs, todo);
 LIN_SDT_PROBE_DEFINE0(sysvec, linux_elf_fixup, todo);
 LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sigreturn, todo);
 LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sendsig, todo);
-LIN_SDT_PROBE_DEFINE0(sysvec, linux_vsyscall, todo);
 LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_install, todo);
 LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_deinstall, todo);
 
@@ -396,15 +394,6 @@ linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t 
*mask)
        LIN_SDT_PROBE0(sysvec, linux_rt_sendsig, todo);
 }
 
-static int
-linux_vsyscall(struct thread *td)
-{
-
-       /* LINUXTODO: implement */
-       LIN_SDT_PROBE0(sysvec, linux_vsyscall, todo);
-       return (EDOOFUS);
-}
-
 struct sysentvec elf_linux_sysvec = {
        .sv_size        = LINUX_SYS_MAXSYSCALL,
        .sv_table       = linux_sysent,
@@ -437,7 +426,7 @@ struct sysentvec elf_linux_sysvec = {
        .sv_shared_page_len = PAGE_SIZE,
        .sv_schedtail   = linux_schedtail,
        .sv_thread_detach = linux_thread_detach,
-       .sv_trap        = linux_vsyscall,
+       .sv_trap        = NULL,
        .sv_hwcap       = &elf_hwcap,
        .sv_hwcap2      = &elf_hwcap2,
        .sv_onexec      = linux_on_exec,

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