sched/cache: Keep nr_pref_llc_running in the runnable domain, to fix LLC mis-scheduling buggrafted

alb_break_llc() decides whether to break LLC preference during active
load balance. It does so by testing that every runnable fair task on the
source rq prefers its LLC:

	env->src_rq->nr_pref_llc_running == env->src_rq->cfs.h_nr_runnable

But the two counters cover different sets. nr_pref_llc_running is updated
in account_llc_enqueue()/account_llc_dequeue(), next to cfs_rq->nr_queued,
so it follows queued tasks. h_nr_runnable is updated in set_delayed()/
clear_delayed() and drops delay-dequeued tasks.

So under DELAY_DEQUEUE, a preferring task that goes to sleep stays counted
in nr_pref_llc_running while h_nr_runnable falls. The equality then breaks,
alb_break_llc() returns false, and active balance is free to pull a task
off its preferred LLC. Active balance only moves runnable tasks, and this
is the only LLC check it consults: once the stopper runs, LBF_ACTIVE_LB
skips the per-task test in can_migrate_task(). The runnable set is the one
we want.

Fix it on the counter side. A task should be counted in
nr_pref_llc_running exactly while it is both queued on its preferred LLC
(pref_llc_queued) and runnable (!sched_delayed). Define that membership
once in task_pref_llc_runnable(), and adjust the counter only through
pref_llc_running_inc()/pref_llc_running_dec() from the four sites that
change either input: account_llc_enqueue(), account_llc_dequeue(),
set_delayed() and clear_delayed(). Gating every update on the same
predicate keeps the delay, wake and dequeue paths from double-counting
or underflowing; see the comments at those sites for the ordering.

nr_llc_running and sd->llc_counts are not touched and stay on queued
semantics.

Fixes: 714059f79ff0 ("sched/cache: Handle moving single tasks to/from their preferred LLC")
Closes: https://lore.kernel.org/lkml/20260827135000.735138-1-zhanxusheng@xiaomi.com/
Reported-by: Zhan Xusheng <zhanxusheng@xiaomi.com>
Suggested-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kayra Cizmeci <kayracizmeci@gmail.com>
Cc: <stable@kernel.org> # v7.2.x
Link: https://patch.msgid.link/06af61afedac32e6477f57feb4d658f6c411c3af.1790035273.git.tim.c.chen@linux.intel.com

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
new file mode 100644
index 000000000..48a863b24
--- /dev/null
+++ b/drivers/hid/Makefile
@@ -0,0 +1,186 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the HID driver
+#
+hid-y			:= hid-core.o hid-input.o hid-quirks.o
+hid-$(CONFIG_DEBUG_FS)		+= hid-debug.o
+hid-$(CONFIG_HID_HAPTIC)	+= hid-haptic.o
+
+obj-$(CONFIG_HID_BPF)		+= bpf/
+
+obj-$(CONFIG_HID)		+= hid.o
+obj-$(CONFIG_UHID)		+= uhid.o
+
+obj-$(CONFIG_HID_GENERIC)	+= hid-generic.o
+
+hid-$(CONFIG_HIDRAW)		+= hidraw.o
+
+hid-logitech-y		:= hid-lg.o
+hid-logitech-$(CONFIG_LOGITECH_FF)	+= hid-lgff.o
+hid-logitech-$(CONFIG_LOGIRUMBLEPAD2_FF)	+= hid-lg2ff.o
+hid-logitech-$(CONFIG_LOGIG940_FF)	+= hid-lg3ff.o
+hid-logitech-$(CONFIG_LOGIWHEELS_FF)	+= hid-lg4ff.o
+
+hid-wiimote-y		:= hid-wiimote-core.o hid-wiimote-modules.o
+hid-wiimote-$(CONFIG_DEBUG_FS)	+= hid-wiimote-debug.o
+
+obj-$(CONFIG_HID_A4TECH)	+= hid-a4tech.o
+obj-$(CONFIG_HID_ACCUTOUCH)	+= hid-accutouch.o
+obj-$(CONFIG_HID_ALPS)		+= hid-alps.o
+obj-$(CONFIG_HID_ACRUX)		+= hid-axff.o
+obj-$(CONFIG_HID_APPLE)		+= hid-apple.o
+obj-$(CONFIG_HID_APPLEIR)	+= hid-appleir.o
+obj-$(CONFIG_HID_APPLETB_BL)	+= hid-appletb-bl.o
+obj-$(CONFIG_HID_APPLETB_KBD)	+= hid-appletb-kbd.o
+obj-$(CONFIG_HID_CREATIVE_SB0540)	+= hid-creative-sb0540.o
+obj-$(CONFIG_HID_ASUS)		+= hid-asus.o
+obj-$(CONFIG_HID_AUREAL)	+= hid-aureal.o
+obj-$(CONFIG_HID_BELKIN)	+= hid-belkin.o
+obj-$(CONFIG_HID_BETOP_FF)	+= hid-betopff.o
+obj-$(CONFIG_HID_BIGBEN_FF)	+= hid-bigbenff.o
+obj-$(CONFIG_HID_CHERRY)	+= hid-cherry.o
+obj-$(CONFIG_HID_CHICONY)	+= hid-chicony.o
+obj-$(CONFIG_HID_CMEDIA)	+= hid-cmedia.o
+obj-$(CONFIG_HID_CORSAIR)	+= hid-corsair.o hid-corsair-void.o
+obj-$(CONFIG_HID_COUGAR)	+= hid-cougar.o
+obj-$(CONFIG_HID_CP2112)	+= hid-cp2112.o
+obj-$(CONFIG_HID_CYPRESS)	+= hid-cypress.o
+obj-$(CONFIG_HID_DRAGONRISE)	+= hid-dr.o
+obj-$(CONFIG_HID_EMS_FF)	+= hid-emsff.o
+obj-$(CONFIG_HID_ELAN)		+= hid-elan.o
+obj-$(CONFIG_HID_ELECOM)	+= hid-elecom.o
+obj-$(CONFIG_HID_ELO)		+= hid-elo.o
+obj-$(CONFIG_HID_EVISION)	+= hid-evision.o
+obj-$(CONFIG_HID_EZKEY)		+= hid-ezkey.o
+obj-$(CONFIG_HID_FT260)		+= hid-ft260.o
+obj-$(CONFIG_HID_GEMBIRD)	+= hid-gembird.o
+obj-$(CONFIG_HID_GFRM)		+= hid-gfrm.o
+obj-$(CONFIG_HID_GLORIOUS)  += hid-glorious.o
+obj-$(CONFIG_HID_VIVALDI_COMMON) += hid-vivaldi-common.o
+obj-$(CONFIG_HID_GOODIX_SPI)	+= hid-goodix-spi.o
+obj-$(CONFIG_HID_GOOGLE_HAMMER)	+= hid-google-hammer.o
+obj-$(CONFIG_HID_GOOGLE_STADIA_FF)	+= hid-google-stadiaff.o
+obj-$(CONFIG_HID_VIVALDI)	+= hid-vivaldi.o
+obj-$(CONFIG_HID_GT683R)	+= hid-gt683r.o
+obj-$(CONFIG_HID_GYRATION)	+= hid-gyration.o
+obj-$(CONFIG_HID_HOLTEK)	+= hid-holtek-kbd.o
+obj-$(CONFIG_HID_HOLTEK)	+= hid-holtek-mouse.o
+obj-$(CONFIG_HID_HOLTEK)	+= hid-holtekff.o
+obj-$(CONFIG_HID_HYPERV_MOUSE)	+= hid-hyperv.o
+obj-$(CONFIG_HID_HYPERX)	+= hid-hyperx.o
+obj-$(CONFIG_HID_ICADE)		+= hid-icade.o
+obj-$(CONFIG_HID_ITE)		+= hid-ite.o
+obj-$(CONFIG_HID_JABRA)		+= hid-jabra.o
+obj-$(CONFIG_HID_KENSINGTON)	+= hid-kensington.o
+obj-$(CONFIG_HID_KEYTOUCH)	+= hid-keytouch.o
+obj-$(CONFIG_HID_KYE)		+= hid-kye.o
+obj-$(CONFIG_HID_KYSONA)	+= hid-kysona.o
+obj-$(CONFIG_HID_LCPOWER)	+= hid-lcpower.o
+obj-$(CONFIG_HID_LENOVO)	+= hid-lenovo.o
+obj-$(CONFIG_HID_LENOVO_GO)	+= hid-lenovo-go.o
+obj-$(CONFIG_HID_LENOVO_GO_S)	+= hid-lenovo-go-s.o
+obj-$(CONFIG_HID_LETSKETCH)	+= hid-letsketch.o
+obj-$(CONFIG_HID_LOGITECH)	+= hid-logitech.o
+obj-$(CONFIG_HID_LOGITECH)	+= hid-lg-g15.o
+obj-$(CONFIG_HID_LOGITECH_DJ)	+= hid-logitech-dj.o
+obj-$(CONFIG_HID_LOGITECH_HIDPP)	+= hid-logitech-hidpp.o
+obj-$(CONFIG_HID_MACALLY)	+= hid-macally.o
+obj-$(CONFIG_HID_MAGICMOUSE)	+= hid-magicmouse.o
+obj-$(CONFIG_HID_MALTRON)	+= hid-maltron.o
+obj-$(CONFIG_HID_MCP2200)	+= hid-mcp2200.o
+obj-$(CONFIG_HID_MCP2221)	+= hid-mcp2221.o
+obj-$(CONFIG_HID_MAYFLASH)	+= hid-mf.o
+obj-$(CONFIG_HID_MEGAWORLD_FF)	+= hid-megaworld.o
+obj-$(CONFIG_HID_MICROSOFT)	+= hid-microsoft.o
+obj-$(CONFIG_HID_MONTEREY)	+= hid-monterey.o
+obj-$(CONFIG_HID_MSI)		+= hid-msi.o
+obj-$(CONFIG_HID_MULTITOUCH)	+= hid-multitouch.o
+obj-$(CONFIG_HID_NINTENDO)	+= hid-nintendo.o
+obj-$(CONFIG_HID_NTI)			+= hid-nti.o
+obj-$(CONFIG_HID_NTRIG)		+= hid-ntrig.o
+obj-$(CONFIG_HID_NVIDIA_SHIELD)	+= hid-nvidia-shield.o
+obj-$(CONFIG_HID_ORTEK)		+= hid-ortek.o
+obj-$(CONFIG_HID_OXP)		+= hid-oxp.o
+obj-$(CONFIG_HID_PRODIKEYS)	+= hid-prodikeys.o
+obj-$(CONFIG_HID_PANTHERLORD)	+= hid-pl.o
+obj-$(CONFIG_HID_PENMOUNT)	+= hid-penmount.o
+obj-$(CONFIG_HID_PETALYNX)	+= hid-petalynx.o
+obj-$(CONFIG_HID_PICOLCD)	+= hid-picolcd.o
+hid-picolcd-y			+= hid-picolcd_core.o
+hid-picolcd-$(CONFIG_HID_PICOLCD_FB)	+= hid-picolcd_fb.o
+hid-picolcd-$(CONFIG_HID_PICOLCD_BACKLIGHT)	+= hid-picolcd_backlight.o
+hid-picolcd-$(CONFIG_HID_PICOLCD_LCD)	+= hid-picolcd_lcd.o
+hid-picolcd-$(CONFIG_HID_PICOLCD_LEDS)	+= hid-picolcd_leds.o
+hid-picolcd-$(CONFIG_HID_PICOLCD_CIR)	+= hid-picolcd_cir.o
+hid-picolcd-$(CONFIG_DEBUG_FS)		+= hid-picolcd_debugfs.o
+
+obj-$(CONFIG_HID_PLANTRONICS)	+= hid-plantronics.o
+obj-$(CONFIG_HID_PLAYSTATION)	+= hid-playstation.o
+obj-$(CONFIG_HID_PRIMAX)	+= hid-primax.o
+obj-$(CONFIG_HID_PXRC)		+= hid-pxrc.o
+obj-$(CONFIG_HID_RAKK)		+= hid-rakk.o
+obj-$(CONFIG_HID_RAPOO) += hid-rapoo.o
+obj-$(CONFIG_HID_RAZER)	+= hid-razer.o
+obj-$(CONFIG_HID_REDRAGON)	+= hid-redragon.o
+obj-$(CONFIG_HID_RETRODE)	+= hid-retrode.o
+obj-$(CONFIG_HID_ROCCAT)	+= hid-roccat.o hid-roccat-common.o \
+	hid-roccat-arvo.o hid-roccat-isku.o hid-roccat-kone.o \
+	hid-roccat-koneplus.o hid-roccat-konepure.o hid-roccat-kovaplus.o \
+	hid-roccat-lua.o hid-roccat-pyra.o hid-roccat-ryos.o hid-roccat-savu.o
+obj-$(CONFIG_HID_RMI)		+= hid-rmi.o
+obj-$(CONFIG_HID_SAITEK)	+= hid-saitek.o
+obj-$(CONFIG_HID_SAMSUNG)	+= hid-samsung.o
+obj-$(CONFIG_HID_SEMITEK)	+= hid-semitek.o
+obj-$(CONFIG_HID_SIGMAMICRO)	+= hid-sigmamicro.o
+obj-$(CONFIG_HID_SMARTJOYPLUS)	+= hid-sjoy.o
+obj-$(CONFIG_HID_SONY)		+= hid-sony.o
+obj-$(CONFIG_HID_SPEEDLINK)	+= hid-speedlink.o
+obj-$(CONFIG_HID_STEAM)		+= hid-steam.o
+obj-$(CONFIG_HID_STEELSERIES)	+= hid-steelseries.o hid-steelseries-arctis.o
+obj-$(CONFIG_HID_SUNPLUS)	+= hid-sunplus.o
+obj-$(CONFIG_HID_GREENASIA)	+= hid-gaff.o
+obj-$(CONFIG_HID_THRUSTMASTER)	+= hid-tmff.o hid-thrustmaster.o
+obj-$(CONFIG_HID_TIVO)		+= hid-tivo.o
+obj-$(CONFIG_HID_TOPSEED)	+= hid-topseed.o
+obj-$(CONFIG_HID_TOPRE)	+= hid-topre.o
+obj-$(CONFIG_HID_TWINHAN)	+= hid-twinhan.o
+obj-$(CONFIG_HID_U2FZERO)	+= hid-u2fzero.o
+hid-uclogic-objs		:= hid-uclogic-core.o \
+				   hid-uclogic-rdesc.o \
+				   hid-uclogic-params.o
+obj-$(CONFIG_HID_UCLOGIC)	+= hid-uclogic.o
+obj-$(CONFIG_HID_UDRAW_PS3)	+= hid-udraw-ps3.o
+obj-$(CONFIG_HID_UNIVERSAL_PIDFF)	+= hid-universal-pidff.o
+obj-$(CONFIG_HID_LED)		+= hid-led.o
+obj-$(CONFIG_HID_XIAOMI)	+= hid-xiaomi.o
+obj-$(CONFIG_HID_XINMO)		+= hid-xinmo.o
+obj-$(CONFIG_HID_ZEROPLUS)	+= hid-zpff.o
+obj-$(CONFIG_HID_ZYDACRON)	+= hid-zydacron.o
+obj-$(CONFIG_HID_VIEWSONIC)	+= hid-viewsonic.o
+obj-$(CONFIG_HID_VRC2)		+= hid-vrc2.o
+obj-$(CONFIG_HID_HUAWEI)	+= hid-huawei.o
+
+wacom-objs			:= wacom_wac.o wacom_sys.o
+obj-$(CONFIG_HID_WACOM)		+= wacom.o
+obj-$(CONFIG_HID_WALTOP)	+= hid-waltop.o
+obj-$(CONFIG_HID_WIIMOTE)	+= hid-wiimote.o
+obj-$(CONFIG_HID_WINWING)	+= hid-winwing.o
+obj-$(CONFIG_HID_SENSOR_HUB)	+= hid-sensor-hub.o
+obj-$(CONFIG_HID_SENSOR_CUSTOM_SENSOR)	+= hid-sensor-custom.o
+
+hid-uclogic-test-objs		:= hid-uclogic-rdesc-test.o
+obj-$(CONFIG_HID_KUNIT_TEST)	+= hid-uclogic.o hid-uclogic-test.o
+
+obj-$(CONFIG_USB_HID)		+= usbhid/
+obj-$(CONFIG_USB_MOUSE)		+= usbhid/
+obj-$(CONFIG_USB_KBD)		+= usbhid/
+
+obj-$(CONFIG_I2C_HID_CORE)	+= i2c-hid/
+
+obj-$(CONFIG_INTEL_ISH_HID)	+= intel-ish-hid/
+
+obj-$(CONFIG_AMD_SFH_HID)       += amd-sfh-hid/
+
+obj-$(CONFIG_SURFACE_HID_CORE)  += surface-hid/
+
+obj-$(CONFIG_INTEL_THC_HID)     += intel-thc-hid/