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, 87 insertions, 0 deletions

diff --git a/drivers/pinctrl/qcom/Makefile b/drivers/pinctrl/qcom/Makefile
new file mode 100644
index 000000000..43ecd246a
--- /dev/null
+++ b/drivers/pinctrl/qcom/Makefile
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: GPL-2.0
+# Qualcomm pin control drivers
+obj-$(CONFIG_PINCTRL_MSM)	+= pinctrl-msm.o
+obj-$(CONFIG_PINCTRL_APQ8064)	+= pinctrl-apq8064.o
+obj-$(CONFIG_PINCTRL_APQ8084)	+= pinctrl-apq8084.o
+obj-$(CONFIG_PINCTRL_ELIZA)	+= pinctrl-eliza.o
+obj-$(CONFIG_PINCTRL_GLYMUR)	+= pinctrl-glymur.o
+obj-$(CONFIG_PINCTRL_HAWI)	+= pinctrl-hawi.o
+obj-$(CONFIG_PINCTRL_IPQ4019)	+= pinctrl-ipq4019.o
+obj-$(CONFIG_PINCTRL_IPQ5018)	+= pinctrl-ipq5018.o
+obj-$(CONFIG_PINCTRL_IPQ8064)	+= pinctrl-ipq8064.o
+obj-$(CONFIG_PINCTRL_IPQ5210)	+= pinctrl-ipq5210.o
+obj-$(CONFIG_PINCTRL_IPQ5332)	+= pinctrl-ipq5332.o
+obj-$(CONFIG_PINCTRL_IPQ5424)	+= pinctrl-ipq5424.o
+obj-$(CONFIG_PINCTRL_IPQ8074)	+= pinctrl-ipq8074.o
+obj-$(CONFIG_PINCTRL_IPQ6018)	+= pinctrl-ipq6018.o
+obj-$(CONFIG_PINCTRL_IPQ9574)	+= pinctrl-ipq9574.o
+obj-$(CONFIG_PINCTRL_IPQ9650)	+= pinctrl-ipq9650.o
+obj-$(CONFIG_PINCTRL_KAANAPALI) += pinctrl-kaanapali.o
+obj-$(CONFIG_PINCTRL_MAILI)	+= pinctrl-maili.o
+obj-$(CONFIG_PINCTRL_MSM8226)	+= pinctrl-msm8226.o
+obj-$(CONFIG_PINCTRL_MSM8660)	+= pinctrl-msm8660.o
+obj-$(CONFIG_PINCTRL_MSM8960)	+= pinctrl-msm8960.o
+obj-$(CONFIG_PINCTRL_MSM8X74)	+= pinctrl-msm8x74.o
+obj-$(CONFIG_PINCTRL_MSM8909)	+= pinctrl-msm8909.o
+obj-$(CONFIG_PINCTRL_MSM8916)	+= pinctrl-msm8916.o
+obj-$(CONFIG_PINCTRL_MSM8917)	+= pinctrl-msm8917.o
+obj-$(CONFIG_PINCTRL_MSM8953)	+= pinctrl-msm8953.o
+obj-$(CONFIG_PINCTRL_MSM8976)	+= pinctrl-msm8976.o
+obj-$(CONFIG_PINCTRL_MSM8994)   += pinctrl-msm8994.o
+obj-$(CONFIG_PINCTRL_MSM8996)   += pinctrl-msm8996.o
+obj-$(CONFIG_PINCTRL_MSM8998)   += pinctrl-msm8998.o
+obj-$(CONFIG_PINCTRL_QCM2290)	+= pinctrl-qcm2290.o
+obj-$(CONFIG_PINCTRL_QCS404)	+= pinctrl-qcs404.o
+obj-$(CONFIG_PINCTRL_QCS615)    += pinctrl-qcs615.o
+obj-$(CONFIG_PINCTRL_QCS8300)	+= pinctrl-qcs8300.o
+obj-$(CONFIG_PINCTRL_QDF2XXX)	+= pinctrl-qdf2xxx.o
+obj-$(CONFIG_PINCTRL_MDM9607)	+= pinctrl-mdm9607.o
+obj-$(CONFIG_PINCTRL_MDM9615)	+= pinctrl-mdm9615.o
+obj-$(CONFIG_PINCTRL_MILOS) += pinctrl-milos.o
+obj-$(CONFIG_PINCTRL_MILOS_LPASS_LPI) += pinctrl-milos-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_NORD)	+= pinctrl-nord.o
+obj-$(CONFIG_PINCTRL_QCOM_SPMI_PMIC) += pinctrl-spmi-gpio.o
+obj-$(CONFIG_PINCTRL_QCOM_SPMI_PMIC) += pinctrl-spmi-mpp.o
+obj-$(CONFIG_PINCTRL_QCOM_SSBI_PMIC) += pinctrl-ssbi-gpio.o
+obj-$(CONFIG_PINCTRL_QCOM_SSBI_PMIC) += pinctrl-ssbi-mpp.o
+obj-$(CONFIG_PINCTRL_QDU1000)	+= pinctrl-qdu1000.o
+obj-$(CONFIG_PINCTRL_SA8775P)	+= pinctrl-sa8775p.o
+obj-$(CONFIG_PINCTRL_SAR2130P)	+= pinctrl-sar2130p.o
+obj-$(CONFIG_PINCTRL_SC7180)	+= pinctrl-sc7180.o
+obj-$(CONFIG_PINCTRL_SC7280)	+= pinctrl-sc7280.o
+obj-$(CONFIG_PINCTRL_SC7280_LPASS_LPI) += pinctrl-sc7280-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SC8180X)	+= pinctrl-sc8180x.o
+obj-$(CONFIG_PINCTRL_SC8280XP)	+= pinctrl-sc8280xp.o
+obj-$(CONFIG_PINCTRL_SDM660)   += pinctrl-sdm660.o
+obj-$(CONFIG_PINCTRL_SDM660_LPASS_LPI) += pinctrl-sdm660-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SDM670) += pinctrl-sdm670.o
+obj-$(CONFIG_PINCTRL_SDM670_LPASS_LPI) += pinctrl-sdm670-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SDM845) += pinctrl-sdm845.o
+obj-$(CONFIG_PINCTRL_SDX55) += pinctrl-sdx55.o
+obj-$(CONFIG_PINCTRL_SDX65) += pinctrl-sdx65.o
+obj-$(CONFIG_PINCTRL_SDX75) += pinctrl-sdx75.o
+obj-$(CONFIG_PINCTRL_SHIKRA) += pinctrl-shikra.o
+obj-$(CONFIG_PINCTRL_SM4250_LPASS_LPI) += pinctrl-sm4250-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SM4450) += pinctrl-sm4450.o
+obj-$(CONFIG_PINCTRL_SM6115) += pinctrl-sm6115.o
+obj-$(CONFIG_PINCTRL_SM6115_LPASS_LPI) += pinctrl-sm6115-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SM6125) += pinctrl-sm6125.o
+obj-$(CONFIG_PINCTRL_SM6350) += pinctrl-sm6350.o
+obj-$(CONFIG_PINCTRL_SM6350_LPASS_LPI) += pinctrl-sm6350-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SM6375) += pinctrl-sm6375.o
+obj-$(CONFIG_PINCTRL_SM7150) += pinctrl-sm7150.o
+obj-$(CONFIG_PINCTRL_SM8150) += pinctrl-sm8150.o
+obj-$(CONFIG_PINCTRL_SM8250) += pinctrl-sm8250.o
+obj-$(CONFIG_PINCTRL_SM8250_LPASS_LPI) += pinctrl-sm8250-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SM8350) += pinctrl-sm8350.o
+obj-$(CONFIG_PINCTRL_SM8450) += pinctrl-sm8450.o
+obj-$(CONFIG_PINCTRL_SM8450_LPASS_LPI) += pinctrl-sm8450-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SM8550) += pinctrl-sm8550.o
+obj-$(CONFIG_PINCTRL_SM8550_LPASS_LPI) += pinctrl-sm8550-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SM8650) += pinctrl-sm8650.o
+obj-$(CONFIG_PINCTRL_SM8650_LPASS_LPI) += pinctrl-sm8650-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_SM8750) += pinctrl-sm8750.o
+obj-$(CONFIG_PINCTRL_SC8280XP_LPASS_LPI) += pinctrl-sc8280xp-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_LPASS_LPI) += pinctrl-lpass-lpi.o
+obj-$(CONFIG_PINCTRL_X1E80100)	+= pinctrl-x1e80100.o
+obj-$(CONFIG_PINCTRL_TLMM_TEST) += tlmm-test.o