Valgrind reports the following error with UML when ubd driver is
compiled in.
==29588== Unsupported clone() flags: 0x500
==29588==
==29588== The only supported clone() uses are:
==29588== - via a threads library (LinuxThreads or NPTL)
==29588== - via the implementation of fork or vfork
Adding CLONE_FS flags silences this issue.
Signed-off-by: Hajime Tazaki <thehajime@xxxxxxxxx>
---
arch/um/drivers/ubd_user.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/um/drivers/ubd_user.c b/arch/um/drivers/ubd_user.c
index a1afe414ce48..fabb50e91c37 100644
--- a/arch/um/drivers/ubd_user.c
+++ b/arch/um/drivers/ubd_user.c
@@ -47,7 +47,8 @@ int start_io_thread(unsigned long sp, int *fd_out)
goto out_close;
}
- pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
+ pid = clone(io_thread, (void *) sp,
+ CLONE_FILES | CLONE_VM | CLONE_FS, NULL);
if(pid < 0){
err = -errno;
printk("start_io_thread - clone failed : errno = %d\n", errno);
--
2.21.0 (Apple Git-122.2)
