[Devel] [C/R v20][PATCH 61/96] c/r: (s390): expose a constant for the number of words (CRs)

[Oren Laadan]

We need to use this value in the checkpoint/restart code and would like to
have a constant instead of a magic '3'.

Changelog:
    Jan 20:
            . Define s390x sys_restart wrapper
    Mar 30:
            . Add CHECKPOINT_SUPPORT in Kconfig (Nathan Lynch)
    Mar 03:
            . Picked up additional use of magic '3' in ptrace.h

Signed-off-by: Dan Smith <danms at us.ibm.com>
Acked-by: Serge E. Hallyn <serue at us.ibm.com>
Tested-by: Serge E. Hallyn <serue at us.ibm.com>
---
 arch/s390/Kconfig          |    4 ++++
 arch/s390/kernel/process.c |    9 +++++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index c802352..95bb4ed 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -49,6 +49,10 @@ config GENERIC_TIME_VSYSCALL
 config GENERIC_CLOCKEVENTS
 	def_bool y
 
+config CHECKPOINT_SUPPORT
+	bool
+	default y if 64BIT
+
 config GENERIC_BUG
 	bool
 	depends on BUG
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 5b0729a..eb834fd 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -240,6 +240,15 @@ SYSCALL_DEFINE4(clone, unsigned long, newsp, unsigned long, clone_flags,
 		       parent_tidptr, child_tidptr);
 }
 
+#ifdef CONFIG_CHECKPOINT
+extern long do_sys_restart(pid_t pid, int fd, unsigned long flags, int logfd);
+SYSCALL_DEFINE4(restart, pid_t, pid, int, fd, unsigned long, flags,
+		int, logfd)
+{
+	return do_sys_restart(pid, fd, flags, logfd);
+}
+#endif
+
 SYSCALL_DEFINE4(eclone, unsigned int, flags_low, struct clone_args __user *,
 		uca, int, args_size, pid_t __user *, pids)
 {
-- 
1.6.3.3

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