s390: wire up clone3 system call

Tested (64-bit and compat mode) using program from
http://lkml.kernel.org/r/20190604212930.jaaztvkent32b7d3@brauner.io
with the following:
       return syscall(__NR_clone, flags, 0, pidfd, 0, 0);
changed to:
       return syscall(__NR_clone, 0, flags, pidfd, 0, 0);
due to CLONE_BACKWARDS2.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

diff --git a/arch/s390/include/asm/unistd.h b/arch/s390/include/asm/unistd.h
index b675568..9e9f75e 100644 (file)
--- a/arch/s390/include/asm/unistd.h
+++ b/arch/s390/include/asm/unistd.h
@@ -34,5 +34,6 @@
 #define __ARCH_WANT_SYS_FORK
 #define __ARCH_WANT_SYS_VFORK
 #define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_SYS_CLONE3
 
 #endif /* _ASM_S390_UNISTD_H_ */

diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index a90d3e9..3054e9c 100644 (file)
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -437,4 +437,4 @@
 432  common    fsmount                 sys_fsmount                     sys_fsmount
 433  common    fspick                  sys_fspick                      sys_fspick
 434  common    pidfd_open              sys_pidfd_open                  sys_pidfd_open
-# 435 reserved for clone3
+435  common    clone3                  sys_clone3                      sys_clone3