AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/base
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David Hildenbrand 641fe2e938 drivers/base/memory.c: don't access uninitialized memmaps in soft_offline_page_store() 
Uninitialized memmaps contain garbage and in the worst case trigger kernel
BUGs, especially with CONFIG_PAGE_POISONING.  They should not get touched.

Right now, when trying to soft-offline a PFN that resides on a memory
block that was never onlined, one gets a misleading error with
CONFIG_PAGE_POISONING:

  :/# echo 5637144576 > /sys/devices/system/memory/soft_offline_page
  [   23.097167] soft offline: 0x150000 page already poisoned

But the actual result depends on the garbage in the memmap.

soft_offline_page() can only work with online pages, it returns -EIO in
case of ZONE_DEVICE.  Make sure to only forward pages that are online
(iow, managed by the buddy) and, therefore, have an initialized memmap.

Add a check against pfn_to_online_page() and similarly return -EIO.

Link: http://lkml.kernel.org/r/20191010141200.8985-1-david@redhat.com
Fixes: f1dd2cd13c ("mm, memory_hotplug: do not associate hotadded memory to zones until online")	[visible after d0dc12e86b]
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: <stable@vger.kernel.org>	[4.13+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-10-19 06:32:31 -04:00
..
firmware_loader firmware: Fix missing inline 2019-07-23 10:20:25 +02:00
power Driver core patches for 5.4-rc1 2019-09-18 10:04:39 -07:00
regmap regmap: Updates for v5.4 2019-09-16 13:57:02 -07:00
test
arch_topology.c Power management updates for 5.4-rc1 2019-09-17 19:15:14 -07:00
attribute_container.c
base.h driver/core: Convert to use built-in RCU list checking 2019-08-13 14:28:47 -07:00
bus.c drivers: Introduce device lookup variants by name 2019-07-30 13:07:41 +02:00
cacheinfo.c Driver Core and debugfs changes for 5.3-rc1 2019-07-12 12:24:03 -07:00
class.c
component.c
container.c
core.c cpufreq: Avoid cpufreq_suspend() deadlock on system shutdown 2019-10-10 11:11:17 +02:00
cpu.c
dd.c Revert "driver core: Add edit_links() callback for drivers" 2019-08-27 21:41:06 +02:00
devcon.c Merge generic_lookup_helpers into usb-next 2019-09-03 17:11:07 +02:00
devcoredump.c devcoredump: fix typo in comment 2019-08-15 17:38:11 +02:00
devres.c
devtmpfs.c vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API 2019-09-12 21:05:34 -04:00
driver.c
firmware.c
hypervisor.c
init.c
isa.c
Kconfig base: arch_topology: update Kconfig help description 2019-07-22 09:36:44 -07:00
Makefile
map.c
memory.c drivers/base/memory.c: don't access uninitialized memmaps in soft_offline_page_store() 2019-10-19 06:32:31 -04:00
module.c
node.c mm,thp: stats for file backed THP 2019-09-24 15:54:11 -07:00
pinctrl.c
platform-msi.c
platform.c driver core: platform: Add platform_get_irq_byname_optional() 2019-10-07 12:52:44 +02:00
property.c
soc.c base: soc: Export soc_device_register/unregister APIs 2019-08-05 14:56:31 -07:00
swnode.c software node: Initialize the return value in software_node_find_by_name() 2019-09-11 19:10:12 +02:00
syscore.c
topology.c
transport_class.c