[v13][PATCH 09/12] Implement sys_eclone for x86_64

[Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>]

From: Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Subject: [v13][PATCH 09/12] Implement sys_eclone for x86_64

Implement sys_eclone() system call for x86_64.

This is based on earlier code from Dave Hansen. Modified to share code
between x86 and x86_64 kernels.

Signed-off-by: Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
---
 arch/x86/include/asm/unistd_64.h |    3 +++
 arch/x86/kernel/entry_64.S       |    1 +
 arch/x86/kernel/process_64.c     |    7 +++++++
 3 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm/unistd_64.h
index 8d3ad0a..d2ffc89 100644
--- a/arch/x86/include/asm/unistd_64.h
+++ b/arch/x86/include/asm/unistd_64.h
@@ -661,6 +661,9 @@ __SYSCALL(__NR_pwritev, sys_pwritev)
 __SYSCALL(__NR_rt_tgsigqueueinfo, sys_rt_tgsigqueueinfo)
 #define __NR_perf_event_open			298
 __SYSCALL(__NR_perf_event_open, sys_perf_event_open)
+#define __NR_eclone                   		299
+__SYSCALL(__NR_eclone, stub_eclone)
+
 
 #ifndef __NO_STUBS
 #define __ARCH_WANT_OLD_READDIR
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index b5c061f..6d60cd1 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -698,6 +698,7 @@ END(\label)
 	PTREGSCALL stub_vfork, sys_vfork, %rdi
 	PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx
 	PTREGSCALL stub_iopl, sys_iopl, %rsi
+	PTREGSCALL stub_eclone, sys_eclone, %r8
 
 ENTRY(ptregscall_common)
 	DEFAULT_FRAME 1 8	/* offset 8: return address */
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index eb62cbc..2c306b9 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -540,6 +540,13 @@ sys_clone(unsigned long clone_flags, unsigned long newsp,
 	return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
 }
 
+asmlinkage long
+sys_eclone(unsigned int flags_low, struct clone_args * __user uca,
+		int args_size, pid_t * __user pids, struct pt_regs *regs)
+{
+	return do_eclone_common(regs, flags_low, uca, args_size, pids);
+}
+
 unsigned long get_wchan(struct task_struct *p)
 {
 	unsigned long stack;
-- 
1.6.0.4