selftests/bpf: Test rhtab kptr cancellation semanticsgrafted

Resizable hash-map updates and deletions must not perform full special-field
destruction in their caller context. In particular, a referenced kptr must
remain attached to the allocation until the memory allocator destructor can
release it safely.

Add separate coverage for both affected paths. The update test stores a task
kptr, replaces the ordinary value bytes with BPF_EXIST, and verifies that the
kptr survived. The delete test removes an element and exchanges its kptr
through the still-valid map-value pointer before the allocation is reclaimed.

Both cases observe a NULL kptr when rhtab uses bpf_obj_free_fields(). They
recover and release the reference after rhtab switches to cancellation
semantics.

Signed-off-by: Nuoqi Gui <gnq25@mails.tsinghua.edu.cn>
[ kkd: Split update and delete coverage and rewrote the commit log ]
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904104203.345917-5-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
new file mode 100644
index 000000000..ed40f1416
--- /dev/null
+++ b/drivers/input/mouse/Makefile
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the mouse drivers.
+#
+
+# Each configuration option enables a list of files.
+
+obj-$(CONFIG_MOUSE_AMIGA)		+= amimouse.o
+obj-$(CONFIG_MOUSE_APPLETOUCH)		+= appletouch.o
+obj-$(CONFIG_MOUSE_ATARI)		+= atarimouse.o
+obj-$(CONFIG_MOUSE_BCM5974)		+= bcm5974.o
+obj-$(CONFIG_MOUSE_CYAPA)		+= cyapatp.o
+obj-$(CONFIG_MOUSE_ELAN_I2C)		+= elan_i2c.o
+obj-$(CONFIG_MOUSE_GPIO)		+= gpio_mouse.o
+obj-$(CONFIG_MOUSE_MAPLE)		+= maplemouse.o
+obj-$(CONFIG_MOUSE_PS2)			+= psmouse.o
+obj-$(CONFIG_MOUSE_RISCPC)		+= rpcmouse.o
+obj-$(CONFIG_MOUSE_SERIAL)		+= sermouse.o
+obj-$(CONFIG_MOUSE_SYNAPTICS_I2C)	+= synaptics_i2c.o
+obj-$(CONFIG_MOUSE_SYNAPTICS_USB)	+= synaptics_usb.o
+obj-$(CONFIG_MOUSE_VSXXXAA)		+= vsxxxaa.o
+
+cyapatp-objs := cyapa.o cyapa_gen3.o cyapa_gen5.o cyapa_gen6.o
+psmouse-objs := psmouse-base.o synaptics.o focaltech.o
+
+psmouse-$(CONFIG_MOUSE_PS2_ALPS)	+= alps.o
+psmouse-$(CONFIG_MOUSE_PS2_BYD)		+= byd.o
+psmouse-$(CONFIG_MOUSE_PS2_ELANTECH)	+= elantech.o
+psmouse-$(CONFIG_MOUSE_PS2_LOGIPS2PP)	+= logips2pp.o
+psmouse-$(CONFIG_MOUSE_PS2_LIFEBOOK)	+= lifebook.o
+psmouse-$(CONFIG_MOUSE_PS2_SENTELIC)	+= sentelic.o
+psmouse-$(CONFIG_MOUSE_PS2_TRACKPOINT)	+= trackpoint.o
+psmouse-$(CONFIG_MOUSE_PS2_TOUCHKIT)	+= touchkit_ps2.o
+psmouse-$(CONFIG_MOUSE_PS2_CYPRESS)	+= cypress_ps2.o
+psmouse-$(CONFIG_MOUSE_PS2_VMMOUSE)	+= vmmouse.o
+
+psmouse-$(CONFIG_MOUSE_PS2_SMBUS)	+= psmouse-smbus.o
+
+elan_i2c-objs := elan_i2c_core.o
+elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_I2C)	+= elan_i2c_i2c.o
+elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_SMBUS)	+= elan_i2c_smbus.o