From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/usb/class/Kconfig | 49 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 drivers/usb/class/Kconfig (limited to 'drivers/usb/class/Kconfig') diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig new file mode 100644 index 000000000..d3f5162bd --- /dev/null +++ b/drivers/usb/class/Kconfig @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# USB Class driver configuration +# +comment "USB Device Class drivers" + +config USB_ACM + tristate "USB Modem (CDC ACM) support" + depends on TTY + help + This driver supports USB modems and ISDN adapters which support the + Communication Device Class Abstract Control Model interface. + Please read for details. + + If your modem only reports "Cls=ff(vend.)" in the descriptors in + /sys/kernel/debug/usb/devices, then your modem will not work with this + driver. + + To compile this driver as a module, choose M here: the + module will be called cdc-acm. + +config USB_PRINTER + tristate "USB Printer support" + help + Say Y here if you want to connect a USB printer to your computer's + USB port. + + To compile this driver as a module, choose M here: the + module will be called usblp. + +config USB_WDM + tristate "USB Wireless Device Management support" + help + This driver supports the WMC Device Management functionality + of cell phones compliant to the CDC WMC specification. You can use + AT commands over this device. + + To compile this driver as a module, choose M here: the + module will be called cdc-wdm. + +config USB_TMC + tristate "USB Test and Measurement Class support" + help + Say Y here if you want to connect a USB device that follows + the USB.org specification for USB Test and Measurement devices + to your computer's USB port. + + To compile this driver as a module, choose M here: the + module will be called usbtmc. -- cgit v1.3.1