renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-22 20:23:57 +08:00
Code
ffc10d82ff
linux-next/drivers/acpi
History
Michal Hocko ffc10d82ff ACPI / scan: Drop support for force_remove 
/sys/firmware/acpi/hotplug/force_remove was presumably added to support
auto offlining in the past. This is, however, inherently dangerous for
some hotplugable resources like memory. The memory offlining fails when
the memory is still in use and cannot be dropped or migrated. If we
ignore the failure we are basically allowing for subtle memory
corruption or a crash.

We have actually noticed the later while hitting BUG() during the memory
hotremove (remove_memory):
	ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
			check_memblock_offlined_cb);
	if (ret)
		BUG();

it took us quite non-trivial time realize that the customer had
force_remove enabled. Even if the BUG was removed here and we could
propagate the error up the call chain it wouldn't help at all because
then we would hit a crash or a memory corruption later and harder to
debug. So force_remove is unfixable for the memory hotremove. We haven't
checked other hotplugable resources to be prone to a similar problems.

Remove the force_remove functionality because it is not fixable currently.
Keep the sysfs file and report an error if somebody tries to enable it.
Encourage users to report about the missing functionality and work with
them with an alternative solution.

Reviewed-by: Lee, Chun-Yi <jlee@suse.com>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-04-13 03:51:47 +02:00
..
acpica scripts/spelling.txt: add "an union" pattern and fix typo instances 2017-02-27 18:43:46 -08:00
apei ACPI / APEI: Add missing synchronize_rcu() on NOTIFY_SCI removal 2017-03-28 23:43:42 +02:00
arm64 arm64 updates for 4.11: 2017-02-22 10:46:44 -08:00
dptf ACPI / platform: Add support for build-in properties 2016-11-10 00:30:29 +01:00
nfit Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2017-03-03 16:48:48 -08:00
pmic ACPI / PMIC: remove modular references from non-modular code 2016-07-16 03:03:14 +02:00
ac.c ACPI: Remove FSF mailing addresses 2015-07-08 02:27:32 +02:00
acpi_amba.c ACPI / amba: Remove CLK_IS_ROOT 2016-04-27 23:42:57 +02:00
acpi_apd.c Merge branches 'acpi-soc', 'acpi-battery', 'acpi-video', 'acpi-cppc' and 'acpi-apei' 2016-12-12 20:48:01 +01:00
acpi_cmos_rtc.c char/genrtc: x86: remove remnants of asm/rtc.h 2016-06-04 00:20:07 +02:00
acpi_configfs.c ACPI: Rename configfs.c to acpi_configfs.c to prevent link error 2016-07-11 15:13:36 +02:00
acpi_dbg.c ACPI / debugger: Fix regression introduced by IS_ERR_VALUE() removal 2016-07-05 23:02:34 +02:00
acpi_extlog.c x86/ras, EDAC, acpi: Assign MCE notifier handlers a priority 2017-01-24 09:14:57 +01:00
acpi_ipmi.c acpi:ipmi: Make IPMI user handler const 2017-02-09 09:10:05 -06:00
acpi_lpat.c ACPI / lpat: make it explicitly non-modular 2016-07-16 03:08:10 +02:00
acpi_lpss.c pwm: Changes for v4.11-rc1 2017-03-01 09:46:02 -08:00
acpi_memhotplug.c ACPI: Remove FSF mailing addresses 2015-07-08 02:27:32 +02:00
acpi_pad.c sched/headers: Prepare for new header dependencies before moving code to <uapi/linux/sched/types.h> 2017-03-02 08:42:27 +01:00
acpi_platform.c ACPI: Do not create a platform_device for IOAPIC/IOxAPIC 2017-03-28 23:37:19 +02:00
acpi_pnp.c ACPI / PNP: constify device IDs 2016-01-04 22:10:30 +01:00
acpi_processor.c acpi/processor: Check for duplicate processor ids at hotplug time 2017-03-11 14:41:20 +01:00
acpi_video.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
acpi_watchdog.c ACPI / watchdog: Print out error number when device creation fails 2016-12-26 23:21:56 +01:00
battery.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
battery.h ACPI / battery: move some ACPI_BATTERY_* definitions to header 2014-03-19 01:57:46 +01:00
bgrt.c efi/x86: Move the EFI BGRT init code to early init code 2017-02-01 08:45:46 +01:00
blacklist.c ACPI / blacklist: Make Dell Latitude 3350 ethernet work 2016-11-16 23:01:29 +01:00
bus.c Revert "x86/acpi: Set persistent cpuid <-> nodeid mapping when booting" 2017-03-11 14:41:18 +01:00
button.c ACPI / button: Remove lid_init_state=method mode 2017-01-31 17:20:45 +01:00
cm_sbs.c ACPI: Remove FSF mailing addresses 2015-07-08 02:27:32 +02:00
container.c ACPI: Remove FSF mailing addresses 2015-07-08 02:27:32 +02:00
cppc_acpi.c ACPI / CPPC: Fix per-CPU pointer management in acpi_cppc_processor_probe() 2016-12-12 23:52:34 +01:00
custom_method.c ACPI: Clean up inclusions of ACPI header files 2013-12-07 01:03:14 +01:00
debugfs.c ACPI: fix acpi_debugfs_init prototype 2015-08-07 02:55:18 +02:00
device_pm.c ACPI / PM: Export acpi_device_fix_up_power() 2016-05-20 15:54:01 +02:00
device_sysfs.c ACPI / property: Hierarchical properties support update 2016-11-24 02:43:47 +01:00
dock.c ACPI / dock: make dock explicitly non-modular 2016-07-16 03:08:08 +02:00
ec_sys.c ACPI / EC: Deny write access unless requested by module param 2016-03-09 23:26:15 +01:00
ec.c ACPI / EC: Use busy polling mode when GPE is not enabled 2017-01-30 12:12:52 +01:00
event.c genetlink: mark families as __ro_after_init 2016-10-27 16:16:09 -04:00
evged.c ACPI / GED: make evged.c explicitly non-modular 2016-05-09 22:59:25 +02:00
fan.c ACPI / fan: Fix error reading cur_state 2016-10-10 02:20:43 +02:00
glue.c ACPI / scan: Prefer devices without _HID for _ADR matching 2017-04-01 00:55:22 +02:00
hed.c ACPI: Remove FSF mailing addresses 2015-07-08 02:27:32 +02:00
internal.h ACPI / scan: Drop support for force_remove 2017-04-13 03:51:47 +02:00
ioapic.c ACPI: ioapic: Clear on-stack resource before using it 2017-03-28 23:31:45 +02:00
irq.c ACPI: Add support for ResourceSource/IRQ domain mapping 2017-02-03 15:03:48 +00:00
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2016-12-14 11:12:25 -08:00
Makefile ACPI: Fix incompatibility with mcount-based function graph tracing 2017-03-28 23:54:43 +02:00
numa.c ACPI/NUMA: Do not map pxm to node when NUMA is turned off 2016-12-15 11:32:32 +01:00
nvs.c ACPI: Clean up acpi_os_map/unmap_memory() to eliminate __iomem. 2014-05-27 18:13:08 +02:00
osi.c ACPI / osi: Collect _OSI handling into one single file 2016-05-05 00:13:53 +02:00
osl.c ACPICA: Hardware: Add sleep register hooks 2017-01-02 23:18:41 +01:00
pci_irq.c ACPI / PCI: fix GIC irq model default PCI IRQ polarity 2016-09-10 02:50:50 +02:00
pci_link.c ACPI/PCI: pci_link: Include PIRQ_PENALTY_PCI_USING for ISA IRQs 2016-10-24 14:18:14 +02:00
pci_mcfg.c PCI/ACPI: Fix bus range comparison in pci_mcfg_lookup() 2017-01-12 14:32:09 -06:00
pci_root.c x86/ioapic: Split IOAPIC hot-removal into two steps 2017-03-01 10:51:41 +01:00
pci_slot.c ACPI / PCI: make pci_slot explicitly non-modular 2016-07-16 03:05:29 +02:00
power.c Merge branch 'acpi-pm' 2015-09-01 03:38:43 +02:00
proc.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
processor_core.c Revert"x86/acpi: Enable MADT APIs to return disabled apicids" 2017-03-11 14:41:18 +01:00
processor_driver.c Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 19:43:08 -07:00
processor_idle.c x86/amd: Simplify AMD E400 aware idle routine 2016-12-09 21:23:21 +01:00
processor_pdc.c ACPI / processor: Introduce invalid_logical_cpuid() 2015-05-13 23:28:14 +02:00
processor_perflib.c ACPI: processor_perflib: Simplify code and stop using CPUFREQ_START 2017-02-04 00:05:29 +01:00
processor_thermal.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
processor_throttling.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
property.c ACPI / property: Hierarchical properties support update 2016-11-24 02:43:47 +01:00
reboot.c
resource.c scripts/spelling.txt: add "overrided" pattern and fix typo instances 2017-02-27 18:43:47 -08:00
sbs.c ACPI / SBS: fix inconsistent indenting inside if statement 2016-01-04 22:14:27 +01:00
sbshc.c Revert "ACPI / SBS: Add 5 us delay to fix SBS hangs on MacBook" 2015-11-16 23:26:45 +01:00
sbshc.h
scan.c ACPI / scan: Drop support for force_remove 2017-04-13 03:51:47 +02:00
sleep.c ACPI: save NVS memory for Lenovo G50-45 2017-01-31 22:46:59 +01:00
sleep.h ACPICA: Drop Linux-specific waking vector functions 2016-01-04 22:05:20 +01:00
spcr.c tty: acpi/spcr: QDF2400 E44 checks for wrong OEM revision 2017-03-14 10:48:54 +08:00
sysfs.c ACPI / scan: Drop support for force_remove 2017-04-13 03:51:47 +02:00
tables.c ACPI / osl: Remove acpi_get_table_with_size()/early_acpi_os_unmap_memory() users 2016-12-21 02:36:38 +01:00
thermal.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
utils.c nfit: make DIMM DSMs optional 2016-07-19 12:32:39 -07:00
video_detect.c Revert "ACPI / video: Add force_native quirk for HP Pavilion dv6" 2017-01-25 14:04:13 +01:00
wakeup.c ACPI: Clean up inclusions of ACPI header files 2013-12-07 01:03:14 +01:00