--- /dev/null
+From 2c8b6de913973274e877639658e9e7273a012adb Mon Sep 17 00:00:00 2001
+From: "Dmitry V. Levin" <ldv@altlinux.org>
+Date: Tue, 8 Jan 2019 19:23:44 +0000
+Subject: [PATCH] mips o32: fix build
+
+Commit 917c2ccf3a67 "Refactor stack pointers" moved mips_REG_* macros
+from linux/mips/arch_regs.h to linux/mips/arch_regs.c because these
+macros are no longer used outside syscall.c or files included by
+syscall.c, but this caused a build regression on mips o32 because
+decode_syscall_subcall() uses mips_REG_SP prior to its definition.
+
+* syscall.c (decode_syscall_subcall): Move ...
+* linux/mips/get_syscall_args.c: ... here.
+* NEWS: Mention this fix.
+
+Reported-by: Baruch Siach <baruch@tkos.co.il>
+Fixes: v4.26~61 "Refactor stack pointers"
+---
+ NEWS | 1 +
+ linux/mips/get_syscall_args.c | 26 ++++++++++++++++++++++++++
+ syscall.c | 27 ++-------------------------
+ 3 files changed, 29 insertions(+), 25 deletions(-)
+
+--- a/linux/mips/get_syscall_args.c
++++ b/linux/mips/get_syscall_args.c
+@@ -37,3 +37,29 @@ arch_get_syscall_args(struct tcb *tcp)
+ #endif
+ return 1;
+ }
++
++#ifdef SYS_syscall_subcall
++static void
++decode_syscall_subcall(struct tcb *tcp)
++{
++ if (!scno_is_valid(tcp->u_arg[0]))
++ return;
++ tcp->scno = tcp->u_arg[0];
++ tcp->qual_flg = qual_flags(tcp->scno);
++ tcp->s_ent = &sysent[tcp->scno];
++ memmove(&tcp->u_arg[0], &tcp->u_arg[1],
++ sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
++ /*
++ * Fetching the last arg of 7-arg syscalls (fadvise64_64
++ * and sync_file_range) requires additional code,
++ * see linux/mips/get_syscall_args.c
++ */
++ if (tcp->s_ent->nargs == MAX_ARGS) {
++ if (umoven(tcp,
++ mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
++ sizeof(tcp->u_arg[0]),
++ &tcp->u_arg[MAX_ARGS - 1]) < 0)
++ tcp->u_arg[MAX_ARGS - 1] = 0;
++ }
++}
++#endif /* SYS_syscall_subcall */
+--- a/syscall.c
++++ b/syscall.c
+@@ -349,31 +349,8 @@ decode_ipc_subcall(struct tcb *tcp)
+ #endif /* SYS_ipc_subcall */
+
+ #ifdef SYS_syscall_subcall
+-static void
+-decode_syscall_subcall(struct tcb *tcp)
+-{
+- if (!scno_is_valid(tcp->u_arg[0]))
+- return;
+- tcp->scno = tcp->u_arg[0];
+- tcp->qual_flg = qual_flags(tcp->scno);
+- tcp->s_ent = &sysent[tcp->scno];
+- memmove(&tcp->u_arg[0], &tcp->u_arg[1],
+- sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
+-# ifdef LINUX_MIPSO32
+- /*
+- * Fetching the last arg of 7-arg syscalls (fadvise64_64
+- * and sync_file_range) requires additional code,
+- * see linux/mips/get_syscall_args.c
+- */
+- if (tcp->s_ent->nargs == MAX_ARGS) {
+- if (umoven(tcp,
+- mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
+- sizeof(tcp->u_arg[0]),
+- &tcp->u_arg[MAX_ARGS - 1]) < 0)
+- tcp->u_arg[MAX_ARGS - 1] = 0;
+- }
+-# endif /* LINUX_MIPSO32 */
+-}
++/* The implementation is architecture specific. */
++static void decode_syscall_subcall(struct tcb *);
+ #endif /* SYS_syscall_subcall */
+
+ static void