From 0e0684cd1c53d68e81d934d7ac2347a4cacc8c15 Mon Sep 17 00:00:00 2001
From: NAKAMURA Gou <go.nakamura.yw@hitachi-solutions.com>
Date: Wed, 28 Aug 2013 17:43:00 +0900
Subject: [PATCH] support shared anonymous mapping

mmap(..., MAP_SHARED|MAP_ANONYMOUS, ...) is possible now.
shared mapped file is still not implemented.
---
 kernel/syscall.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index 8710a827..be321bc1 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -316,6 +316,7 @@ out:
 SYSCALL_DECLARE(mmap)
 {
 	const int supported_flags = 0
+		| MAP_SHARED		// 01
 		| MAP_PRIVATE		// 02
 		| MAP_FIXED		// 10
 		| MAP_ANONYMOUS		// 20
@@ -329,7 +330,6 @@ SYSCALL_DECLARE(mmap)
 		| MAP_STACK		// 00020000
 		;
 	const int error_flags = 0
-		| MAP_SHARED		// 01
 #ifndef	USE_NOCACHE_MMAP
 		| MAP_32BIT		// 40
 #endif /* ndef USE_NOCACHE_MMAP */
@@ -410,6 +410,14 @@ SYSCALL_DECLARE(mmap)
 		goto out;
 	}
 
+	if ((flags & MAP_SHARED) && !(flags & MAP_ANONYMOUS)) {
+		ekprintf("sys_mmap(%lx,%lx,%x,%x,%x,%lx):NYI:shared mapped file%lx\n",
+				addr0, len0, prot, flags, fd, off,
+				(flags & ~(supported_flags | ignored_flags)));
+		error = -EINVAL;
+		goto out;
+	}
+
 	ihk_mc_spinlock_lock_noirq(&proc->vm->memory_range_lock);
 
 	if (flags & MAP_FIXED) {