From d6c51ff997886c715d281d682f5f0e91286b2a73 Mon Sep 17 00:00:00 2001
From: NAKAMURA Gou <go.nakamura.yw@hitachi-solutions.com>
Date: Fri, 18 Mar 2016 15:52:58 +0900
Subject: [PATCH] treat memory devices as regular files,

to enable processes to mmap() /dev/zero
---
 executer/kernel/mcctrl/syscall.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/executer/kernel/mcctrl/syscall.c b/executer/kernel/mcctrl/syscall.c
index 42e5c805..97ca75db 100644
--- a/executer/kernel/mcctrl/syscall.c
+++ b/executer/kernel/mcctrl/syscall.c
@@ -902,7 +902,10 @@ static int pager_req_create(ihk_os_t os, int fd, uintptr_t result_pa)
 		dprintk("pager_req_create(%d,%lx):vfs_stat failed. %d\n", fd, (long)result_pa, error);
 		goto out;
 	}
-	if (!S_ISREG(st.mode)) {
+	if (S_ISCHR(st.mode) && (MAJOR(st.rdev) == 1)) {
+		/* treat memory devices as regular files */
+	}
+	else if (!S_ISREG(st.mode)) {
 		error = -ESRCH;
 		dprintk("pager_req_create(%d,%lx):not VREG. %x\n", fd, (long)result_pa, st.mode);
 		goto out;