On MIPS the checksyscalls.sh script may be executed multiple times.
Currently these multiple executions are executed on each build as kbuild
see that the commands have changed each time.

Use a dedicated stamp file for each different invocation to avoid the
spurious executions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
---
 Kbuild             | 4 ++--
 arch/mips/Makefile | 6 ++----
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/Kbuild b/Kbuild
index 515cc6a27477..a6a0192dea08 100644
--- a/Kbuild
+++ b/Kbuild
@@ -47,11 +47,11 @@ $(rq-offsets-file): kernel/sched/rq-offsets.s FORCE
 
 # Check for missing system calls
 
-missing-syscalls-file := .tmp_missing-syscalls
+missing-syscalls-file := .tmp_missing-syscalls$(missing_syscalls_instance)
 
 targets += $(missing-syscalls-file)
 
-quiet_cmd_syscalls = CALL    $<
+quiet_cmd_syscalls = CALL    $< $(addprefix for ,$(missing_syscalls_instance))
       cmd_syscalls = DEPFILE=$(depfile) $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags); touch $@
 
 $(missing-syscalls-file): scripts/checksyscalls.sh $(rq-offsets-file) FORCE
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index d9057e29bc62..6705fa5d9211 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -421,12 +421,10 @@ CLEAN_FILES += vmlinux.32 vmlinux.64
 
 archprepare:
 ifdef CONFIG_MIPS32_N32
-	@$(kecho) '  Checking missing-syscalls for N32'
-	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=n32"
+	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_instance="N32" missing_syscalls_flags="-mabi=n32"
 endif
 ifdef CONFIG_MIPS32_O32
-	@$(kecho) '  Checking missing-syscalls for O32'
-	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=32"
+	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_instance="O32" missing_syscalls_flags="-mabi=32"
 endif
 
 install:

-- 
2.53.0