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, 175 insertions, 0 deletions

diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
new file mode 100644
index 000000000..892a54eeb
--- /dev/null
+++ b/drivers/clk/mediatek/Makefile
@@ -0,0 +1,175 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_COMMON_CLK_MEDIATEK) += clk-mtk.o clk-pll.o clk-gate.o clk-apmixed.o clk-cpumux.o reset.o clk-mux.o
+obj-$(CONFIG_COMMON_CLK_MEDIATEK_FHCTL) += clk-fhctl.o clk-pllfh.o
+
+obj-$(CONFIG_COMMON_CLK_MT6735) += clk-mt6735-apmixedsys.o clk-mt6735-infracfg.o clk-mt6735-pericfg.o clk-mt6735-topckgen.o
+obj-$(CONFIG_COMMON_CLK_MT6735_IMGSYS) += clk-mt6735-imgsys.o
+obj-$(CONFIG_COMMON_CLK_MT6735_MFGCFG) += clk-mt6735-mfgcfg.o
+obj-$(CONFIG_COMMON_CLK_MT6735_VDECSYS) += clk-mt6735-vdecsys.o
+obj-$(CONFIG_COMMON_CLK_MT6735_VENCSYS) += clk-mt6735-vencsys.o
+obj-$(CONFIG_COMMON_CLK_MT6765) += clk-mt6765.o
+obj-$(CONFIG_COMMON_CLK_MT6765_AUDIOSYS) += clk-mt6765-audio.o
+obj-$(CONFIG_COMMON_CLK_MT6765_CAMSYS) += clk-mt6765-cam.o
+obj-$(CONFIG_COMMON_CLK_MT6765_IMGSYS) += clk-mt6765-img.o
+obj-$(CONFIG_COMMON_CLK_MT6765_MIPI0ASYS) += clk-mt6765-mipi0a.o
+obj-$(CONFIG_COMMON_CLK_MT6765_MMSYS) += clk-mt6765-mm.o
+obj-$(CONFIG_COMMON_CLK_MT6765_VCODECSYS) += clk-mt6765-vcodec.o
+obj-$(CONFIG_COMMON_CLK_MT6779) += clk-mt6779.o
+obj-$(CONFIG_COMMON_CLK_MT6779_MMSYS) += clk-mt6779-mm.o
+obj-$(CONFIG_COMMON_CLK_MT6779_IMGSYS) += clk-mt6779-img.o
+obj-$(CONFIG_COMMON_CLK_MT6779_IPESYS) += clk-mt6779-ipe.o
+obj-$(CONFIG_COMMON_CLK_MT6779_CAMSYS) += clk-mt6779-cam.o
+obj-$(CONFIG_COMMON_CLK_MT6779_VDECSYS) += clk-mt6779-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT6779_VENCSYS) += clk-mt6779-venc.o
+obj-$(CONFIG_COMMON_CLK_MT6779_MFGCFG) += clk-mt6779-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT6779_AUDSYS) += clk-mt6779-aud.o
+obj-$(CONFIG_COMMON_CLK_MT6795) += clk-mt6795-apmixedsys.o clk-mt6795-infracfg.o \
+				   clk-mt6795-pericfg.o clk-mt6795-topckgen.o
+obj-$(CONFIG_COMMON_CLK_MT6795_MFGCFG) += clk-mt6795-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT6795_MMSYS) += clk-mt6795-mm.o
+obj-$(CONFIG_COMMON_CLK_MT6795_VDECSYS) += clk-mt6795-vdecsys.o
+obj-$(CONFIG_COMMON_CLK_MT6795_VENCSYS) += clk-mt6795-vencsys.o
+obj-$(CONFIG_COMMON_CLK_MT6797) += clk-mt6797.o
+obj-$(CONFIG_COMMON_CLK_MT6797_IMGSYS) += clk-mt6797-img.o
+obj-$(CONFIG_COMMON_CLK_MT6797_MMSYS) += clk-mt6797-mm.o
+obj-$(CONFIG_COMMON_CLK_MT6797_VDECSYS) += clk-mt6797-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT6797_VENCSYS) += clk-mt6797-venc.o
+obj-$(CONFIG_COMMON_CLK_MT2701) += clk-mt2701.o
+obj-$(CONFIG_COMMON_CLK_MT2701_AUDSYS) += clk-mt2701-aud.o
+obj-$(CONFIG_COMMON_CLK_MT2701_BDPSYS) += clk-mt2701-bdp.o
+obj-$(CONFIG_COMMON_CLK_MT2701_ETHSYS) += clk-mt2701-eth.o
+obj-$(CONFIG_COMMON_CLK_MT2701_G3DSYS) += clk-mt2701-g3d.o
+obj-$(CONFIG_COMMON_CLK_MT2701_HIFSYS) += clk-mt2701-hif.o
+obj-$(CONFIG_COMMON_CLK_MT2701_IMGSYS) += clk-mt2701-img.o
+obj-$(CONFIG_COMMON_CLK_MT2701_MMSYS) += clk-mt2701-mm.o
+obj-$(CONFIG_COMMON_CLK_MT2701_VDECSYS) += clk-mt2701-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT2712) += clk-mt2712-apmixedsys.o clk-mt2712.o
+obj-$(CONFIG_COMMON_CLK_MT2712_BDPSYS) += clk-mt2712-bdp.o
+obj-$(CONFIG_COMMON_CLK_MT2712_IMGSYS) += clk-mt2712-img.o
+obj-$(CONFIG_COMMON_CLK_MT2712_JPGDECSYS) += clk-mt2712-jpgdec.o
+obj-$(CONFIG_COMMON_CLK_MT2712_MFGCFG) += clk-mt2712-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT2712_MMSYS) += clk-mt2712-mm.o
+obj-$(CONFIG_COMMON_CLK_MT2712_VDECSYS) += clk-mt2712-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT2712_VENCSYS) += clk-mt2712-venc.o
+obj-$(CONFIG_COMMON_CLK_MT7622) += clk-mt7622-apmixedsys.o clk-mt7622.o \
+				   clk-mt7622-infracfg.o
+obj-$(CONFIG_COMMON_CLK_MT7622_ETHSYS) += clk-mt7622-eth.o
+obj-$(CONFIG_COMMON_CLK_MT7622_HIFSYS) += clk-mt7622-hif.o
+obj-$(CONFIG_COMMON_CLK_MT7622_AUDSYS) += clk-mt7622-aud.o
+obj-$(CONFIG_COMMON_CLK_MT7629) += clk-mt7629.o
+obj-$(CONFIG_COMMON_CLK_MT7629_ETHSYS) += clk-mt7629-eth.o
+obj-$(CONFIG_COMMON_CLK_MT7629_HIFSYS) += clk-mt7629-hif.o
+obj-$(CONFIG_COMMON_CLK_MT7981) += clk-mt7981-apmixed.o
+obj-$(CONFIG_COMMON_CLK_MT7981) += clk-mt7981-topckgen.o
+obj-$(CONFIG_COMMON_CLK_MT7981) += clk-mt7981-infracfg.o
+obj-$(CONFIG_COMMON_CLK_MT7981_ETHSYS) += clk-mt7981-eth.o
+obj-$(CONFIG_COMMON_CLK_MT7986) += clk-mt7986-apmixed.o
+obj-$(CONFIG_COMMON_CLK_MT7986) += clk-mt7986-topckgen.o
+obj-$(CONFIG_COMMON_CLK_MT7986) += clk-mt7986-infracfg.o
+obj-$(CONFIG_COMMON_CLK_MT7986_ETHSYS) += clk-mt7986-eth.o
+obj-$(CONFIG_COMMON_CLK_MT7988) += clk-mt7988-apmixed.o
+obj-$(CONFIG_COMMON_CLK_MT7988) += clk-mt7988-topckgen.o
+obj-$(CONFIG_COMMON_CLK_MT7988) += clk-mt7988-infracfg.o
+obj-$(CONFIG_COMMON_CLK_MT7988) += clk-mt7988-eth.o
+obj-$(CONFIG_COMMON_CLK_MT7988) += clk-mt7988-xfipll.o
+obj-$(CONFIG_COMMON_CLK_MT8135) += clk-mt8135-apmixedsys.o clk-mt8135.o
+obj-$(CONFIG_COMMON_CLK_MT8167) += clk-mt8167-apmixedsys.o clk-mt8167.o
+obj-$(CONFIG_COMMON_CLK_MT8167_AUDSYS) += clk-mt8167-aud.o
+obj-$(CONFIG_COMMON_CLK_MT8167_IMGSYS) += clk-mt8167-img.o
+obj-$(CONFIG_COMMON_CLK_MT8167_MFGCFG) += clk-mt8167-mfgcfg.o
+obj-$(CONFIG_COMMON_CLK_MT8167_MMSYS) += clk-mt8167-mm.o
+obj-$(CONFIG_COMMON_CLK_MT8167_VDECSYS) += clk-mt8167-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT8173) += clk-mt8173-apmixedsys.o clk-mt8173-infracfg.o \
+				   clk-mt8173-pericfg.o clk-mt8173-topckgen.o
+obj-$(CONFIG_COMMON_CLK_MT8173_IMGSYS) += clk-mt8173-img.o
+obj-$(CONFIG_COMMON_CLK_MT8173_MFGTOP) += clk-mt8173-mfgtop.o
+obj-$(CONFIG_COMMON_CLK_MT8173_MMSYS) += clk-mt8173-mm.o
+obj-$(CONFIG_COMMON_CLK_MT8173_VDECSYS) += clk-mt8173-vdecsys.o
+obj-$(CONFIG_COMMON_CLK_MT8173_VENCSYS) += clk-mt8173-vencsys.o
+obj-$(CONFIG_COMMON_CLK_MT8183) += clk-mt8183-apmixedsys.o clk-mt8183.o
+obj-$(CONFIG_COMMON_CLK_MT8183_AUDIOSYS) += clk-mt8183-audio.o
+obj-$(CONFIG_COMMON_CLK_MT8183_CAMSYS) += clk-mt8183-cam.o
+obj-$(CONFIG_COMMON_CLK_MT8183_IMGSYS) += clk-mt8183-img.o
+obj-$(CONFIG_COMMON_CLK_MT8183_IPU_CORE0) += clk-mt8183-ipu0.o
+obj-$(CONFIG_COMMON_CLK_MT8183_IPU_CORE1) += clk-mt8183-ipu1.o
+obj-$(CONFIG_COMMON_CLK_MT8183_IPU_ADL) += clk-mt8183-ipu_adl.o
+obj-$(CONFIG_COMMON_CLK_MT8183_IPU_CONN) += clk-mt8183-ipu_conn.o
+obj-$(CONFIG_COMMON_CLK_MT8183_MFGCFG) += clk-mt8183-mfgcfg.o
+obj-$(CONFIG_COMMON_CLK_MT8183_MMSYS) += clk-mt8183-mm.o
+obj-$(CONFIG_COMMON_CLK_MT8183_VDECSYS) += clk-mt8183-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT8183_VENCSYS) += clk-mt8183-venc.o
+obj-$(CONFIG_COMMON_CLK_MT8186) += clk-mt8186-apmixedsys.o clk-mt8186-topckgen.o \
+				   clk-mt8186-infra_ao.o
+obj-$(CONFIG_COMMON_CLK_MT8186_CAMSYS) += clk-mt8186-cam.o
+obj-$(CONFIG_COMMON_CLK_MT8186_IMGSYS) += clk-mt8186-img.o
+obj-$(CONFIG_COMMON_CLK_MT8186_IMP_IIC_WRAP) += clk-mt8186-imp_iic_wrap.o
+obj-$(CONFIG_COMMON_CLK_MT8186_IPESYS) += clk-mt8186-ipe.o
+obj-$(CONFIG_COMMON_CLK_MT8186_MCUSYS) += clk-mt8186-mcu.o
+obj-$(CONFIG_COMMON_CLK_MT8186_MDPSYS) += clk-mt8186-mdp.o
+obj-$(CONFIG_COMMON_CLK_MT8186_MFGCFG) += clk-mt8186-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT8186_MMSYS) += clk-mt8186-mm.o
+obj-$(CONFIG_COMMON_CLK_MT8186_VDECSYS) += clk-mt8186-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT8186_VENCSYS) += clk-mt8186-venc.o
+obj-$(CONFIG_COMMON_CLK_MT8186_WPESYS) += clk-mt8186-wpe.o
+obj-$(CONFIG_COMMON_CLK_MT8188) += clk-mt8188-apmixedsys.o clk-mt8188-topckgen.o \
+				   clk-mt8188-peri_ao.o clk-mt8188-infra_ao.o
+obj-$(CONFIG_COMMON_CLK_MT8188_ADSP_AUDIO26M) += clk-mt8188-adsp_audio26m.o
+obj-$(CONFIG_COMMON_CLK_MT8188_CAMSYS) += clk-mt8188-cam.o clk-mt8188-ccu.o
+obj-$(CONFIG_COMMON_CLK_MT8188_IMGSYS) += clk-mt8188-img.o
+obj-$(CONFIG_COMMON_CLK_MT8188_IMP_IIC_WRAP) += clk-mt8188-imp_iic_wrap.o
+obj-$(CONFIG_COMMON_CLK_MT8188_IPESYS) += clk-mt8188-ipe.o
+obj-$(CONFIG_COMMON_CLK_MT8188_MFGCFG) += clk-mt8188-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT8188_VDECSYS) += clk-mt8188-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT8188_VDOSYS) += clk-mt8188-vdo0.o clk-mt8188-vdo1.o
+obj-$(CONFIG_COMMON_CLK_MT8188_VENCSYS) += clk-mt8188-venc.o
+obj-$(CONFIG_COMMON_CLK_MT8188_VPPSYS) += clk-mt8188-vpp0.o clk-mt8188-vpp1.o
+obj-$(CONFIG_COMMON_CLK_MT8188_WPESYS) += clk-mt8188-wpe.o
+obj-$(CONFIG_COMMON_CLK_MT8192) += clk-mt8192-apmixedsys.o clk-mt8192.o
+obj-$(CONFIG_COMMON_CLK_MT8192_AUDSYS) += clk-mt8192-aud.o
+obj-$(CONFIG_COMMON_CLK_MT8192_CAMSYS) += clk-mt8192-cam.o
+obj-$(CONFIG_COMMON_CLK_MT8192_IMGSYS) += clk-mt8192-img.o
+obj-$(CONFIG_COMMON_CLK_MT8192_IMP_IIC_WRAP) += clk-mt8192-imp_iic_wrap.o
+obj-$(CONFIG_COMMON_CLK_MT8192_IPESYS) += clk-mt8192-ipe.o
+obj-$(CONFIG_COMMON_CLK_MT8192_MDPSYS) += clk-mt8192-mdp.o
+obj-$(CONFIG_COMMON_CLK_MT8192_MFGCFG) += clk-mt8192-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT8192_MMSYS) += clk-mt8192-mm.o
+obj-$(CONFIG_COMMON_CLK_MT8192_MSDC) += clk-mt8192-msdc.o
+obj-$(CONFIG_COMMON_CLK_MT8192_SCP_ADSP) += clk-mt8192-scp_adsp.o
+obj-$(CONFIG_COMMON_CLK_MT8192_VDECSYS) += clk-mt8192-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT8192_VENCSYS) += clk-mt8192-venc.o
+obj-$(CONFIG_COMMON_CLK_MT8195) += clk-mt8195-apmixedsys.o clk-mt8195-topckgen.o \
+				   clk-mt8195-peri_ao.o clk-mt8195-infra_ao.o
+obj-$(CONFIG_COMMON_CLK_MT8195_APUSYS) += clk-mt8195-apusys_pll.o
+obj-$(CONFIG_COMMON_CLK_MT8195_CAMSYS) += clk-mt8195-cam.o clk-mt8195-ccu.o
+obj-$(CONFIG_COMMON_CLK_MT8195_IMGSYS) += clk-mt8195-img.o
+obj-$(CONFIG_COMMON_CLK_MT8195_IMP_IIC_WRAP) += clk-mt8195-imp_iic_wrap.o
+obj-$(CONFIG_COMMON_CLK_MT8195_IPESYS) += clk-mt8195-ipe.o
+obj-$(CONFIG_COMMON_CLK_MT8195_MFGCFG) += clk-mt8195-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT8195_SCP_ADSP) += clk-mt8195-scp_adsp.o
+obj-$(CONFIG_COMMON_CLK_MT8195_VDECSYS) += clk-mt8195-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT8195_VDOSYS) += clk-mt8195-vdo0.o clk-mt8195-vdo1.o
+obj-$(CONFIG_COMMON_CLK_MT8195_VENCSYS) += clk-mt8195-venc.o
+obj-$(CONFIG_COMMON_CLK_MT8195_VPPSYS) += clk-mt8195-vpp0.o clk-mt8195-vpp1.o
+obj-$(CONFIG_COMMON_CLK_MT8195_WPESYS) += clk-mt8195-wpe.o
+obj-$(CONFIG_COMMON_CLK_MT8196) += clk-mt8196-apmixedsys.o clk-mt8196-topckgen.o \
+				   clk-mt8196-topckgen2.o clk-mt8196-vlpckgen.o \
+				   clk-mt8196-peri_ao.o
+obj-$(CONFIG_COMMON_CLK_MT8196_IMP_IIC_WRAP) += clk-mt8196-imp_iic_wrap.o
+obj-$(CONFIG_COMMON_CLK_MT8196_MCUSYS) += clk-mt8196-mcu.o
+obj-$(CONFIG_COMMON_CLK_MT8196_MDPSYS) += clk-mt8196-mdpsys.o
+obj-$(CONFIG_COMMON_CLK_MT8196_MFGCFG) += clk-mt8196-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT8196_MMSYS) += clk-mt8196-disp0.o clk-mt8196-disp1.o clk-mt8196-vdisp_ao.o \
+					 clk-mt8196-ovl0.o clk-mt8196-ovl1.o
+obj-$(CONFIG_COMMON_CLK_MT8196_PEXTPSYS) += clk-mt8196-pextp.o
+obj-$(CONFIG_COMMON_CLK_MT8196_UFSSYS) += clk-mt8196-ufs_ao.o
+obj-$(CONFIG_COMMON_CLK_MT8196_VDECSYS) += clk-mt8196-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT8196_VENCSYS) += clk-mt8196-venc.o
+obj-$(CONFIG_COMMON_CLK_MT8365) += clk-mt8365-apmixedsys.o clk-mt8365.o
+obj-$(CONFIG_COMMON_CLK_MT8365_APU) += clk-mt8365-apu.o
+obj-$(CONFIG_COMMON_CLK_MT8365_CAM) += clk-mt8365-cam.o
+obj-$(CONFIG_COMMON_CLK_MT8365_MFG) += clk-mt8365-mfg.o
+obj-$(CONFIG_COMMON_CLK_MT8365_MMSYS) += clk-mt8365-mm.o
+obj-$(CONFIG_COMMON_CLK_MT8365_VDEC) += clk-mt8365-vdec.o
+obj-$(CONFIG_COMMON_CLK_MT8365_VENC) += clk-mt8365-venc.o
+obj-$(CONFIG_COMMON_CLK_MT8516) += clk-mt8516-apmixedsys.o clk-mt8516.o
+obj-$(CONFIG_COMMON_CLK_MT8516_AUDSYS) += clk-mt8516-aud.o