acrn-kernel/drivers/cpuidle
Russell Currey 4c8568cf4c powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT
[ Upstream commit eac030b22e ]

lppaca_shared_proc() takes a pointer to the lppaca which is typically
accessed through get_lppaca().  With DEBUG_PREEMPT enabled, this leads
to checking if preemption is enabled, for example:

  BUG: using smp_processor_id() in preemptible [00000000] code: grep/10693
  caller is lparcfg_data+0x408/0x19a0
  CPU: 4 PID: 10693 Comm: grep Not tainted 6.5.0-rc3 #2
  Call Trace:
    dump_stack_lvl+0x154/0x200 (unreliable)
    check_preemption_disabled+0x214/0x220
    lparcfg_data+0x408/0x19a0
    ...

This isn't actually a problem however, as it does not matter which
lppaca is accessed, the shared proc state will be the same.
vcpudispatch_stats_procfs_init() already works around this by disabling
preemption, but the lparcfg code does not, erroring any time
/proc/powerpc/lparcfg is accessed with DEBUG_PREEMPT enabled.

Instead of disabling preemption on the caller side, rework
lppaca_shared_proc() to not take a pointer and instead directly access
the lppaca, bypassing any potential preemption checks.

Fixes: f13c13a005 ("powerpc: Stop using non-architected shared_proc field in lppaca")
Signed-off-by: Russell Currey <ruscur@russell.cc>
[mpe: Rework to avoid needing a definition in paca.h and lppaca.h]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230823055317.751786-4-mpe@ellerman.id.au
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-09-13 09:42:48 +02:00
..
governors
Kconfig
Kconfig.arm
Kconfig.mips
Kconfig.powerpc
Kconfig.riscv
Makefile
coupled.c
cpuidle-arm.c
cpuidle-at91.c
cpuidle-big_little.c
cpuidle-calxeda.c
cpuidle-clps711x.c
cpuidle-cps.c
cpuidle-exynos.c
cpuidle-haltpoll.c
cpuidle-kirkwood.c
cpuidle-mvebu-v7.c
cpuidle-powernv.c
cpuidle-psci-domain.c cpuidle: psci: Move enabling OSI mode after power domains creation 2023-08-23 17:52:17 +02:00
cpuidle-psci.c
cpuidle-psci.h
cpuidle-pseries.c powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT 2023-09-13 09:42:48 +02:00
cpuidle-qcom-spm.c
cpuidle-riscv-sbi.c
cpuidle-tegra.c
cpuidle-ux500.c
cpuidle-zynq.c
cpuidle.c
cpuidle.h
driver.c
dt_idle_genpd.c
dt_idle_genpd.h
dt_idle_states.c
dt_idle_states.h
governor.c
poll_state.c
sysfs.c