From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- net/9p/Kconfig | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 net/9p/Kconfig (limited to 'net/9p/Kconfig') diff --git a/net/9p/Kconfig b/net/9p/Kconfig new file mode 100644 index 000000000..22f8c1678 --- /dev/null +++ b/net/9p/Kconfig @@ -0,0 +1,63 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# 9P protocol configuration +# + +menuconfig NET_9P + tristate "Plan 9 Resource Sharing Support (9P2000)" + select NETFS_SUPPORT + help + If you say Y here, you will get experimental support for + Plan 9 resource sharing via the 9P2000 protocol. + + See for more information. + + If unsure, say N. + +if NET_9P + +config NET_9P_FD + default NET_9P + imply INET + imply UNIX + tristate "9P FD Transport" + help + This builds support for transports over TCP, Unix sockets and + filedescriptors. + +config NET_9P_VIRTIO + depends on VIRTIO + tristate "9P Virtio Transport" + help + This builds support for a transports between + guest partitions and a host partition. + +config NET_9P_XEN + depends on XEN + select XEN_XENBUS_FRONTEND + tristate "9P Xen Transport" + help + This builds support for a transport for 9pfs between + two Xen domains. + +config NET_9P_USBG + tristate "9P USB Gadget Transport" + depends on USB_GADGET + select CONFIGFS_FS + select USB_LIBCOMPOSITE + help + This builds support for a transport for 9pfs over + usb gadget. + +config NET_9P_RDMA + depends on INET && INFINIBAND && INFINIBAND_ADDR_TRANS + tristate "9P RDMA Transport (Experimental)" + help + This builds support for an RDMA transport. + +config NET_9P_DEBUG + bool "Debug information" + help + Say Y if you want the 9P subsystem to log debug information. + +endif -- cgit v1.3.1