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linux_dsm_epyc7002/arch
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Vaibhav Jain cc74896531 powerpc/mm: Add cond_resched() while removing hpte mappings 
[ Upstream commit a5d6a3e73acbd619dd5b7b831762b755f9e2db80 ]

While removing large number of mappings from hash page tables for
large memory systems as soft-lockup is reported because of the time
spent inside htap_remove_mapping() like one below:

 watchdog: BUG: soft lockup - CPU#8 stuck for 23s!
 <snip>
 NIP plpar_hcall+0x38/0x58
 LR  pSeries_lpar_hpte_invalidate+0x68/0xb0
 Call Trace:
  0x1fffffffffff000 (unreliable)
  pSeries_lpar_hpte_removebolted+0x9c/0x230
  hash__remove_section_mapping+0xec/0x1c0
  remove_section_mapping+0x28/0x3c
  arch_remove_memory+0xfc/0x150
  devm_memremap_pages_release+0x180/0x2f0
  devm_action_release+0x30/0x50
  release_nodes+0x28c/0x300
  device_release_driver_internal+0x16c/0x280
  unbind_store+0x124/0x170
  drv_attr_store+0x44/0x60
  sysfs_kf_write+0x64/0x90
  kernfs_fop_write+0x1b0/0x290
  __vfs_write+0x3c/0x70
  vfs_write+0xd4/0x270
  ksys_write+0xdc/0x130
  system_call+0x5c/0x70

Fix this by adding a cond_resched() to the loop in
htap_remove_mapping() that issues hcall to remove hpte mapping. The
call to cond_resched() is issued every HZ jiffies which should prevent
the soft-lockup from being reported.

Suggested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210404163148.321346-1-vaibhav@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-05-19 10:12:56 +02:00
..
alpha local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
arc arc: kernel: Return -EFAULT if copy_to_user() fails 2021-04-21 13:00:51 +02:00
arm ARM: dts: uniphier: Change phy-mode to RGMII-ID to enable delay pins for RTL8211E 2021-05-14 09:50:43 +02:00
arm64 arm64: Remove arm64_dma32_phys_limit and its uses 2021-05-14 09:50:46 +02:00
c6x arch-cleanup-2020-10-22 2020-10-23 10:06:38 -07:00
csky csky: change a Kconfig symbol name to fix e1000 build error 2021-04-28 13:40:02 +02:00
h8300 h8300: fix PREEMPTION build, TI_PRE_COUNT undefined 2021-02-17 11:02:28 +01:00
hexagon local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
ia64 ia64: fix EFI_DEBUG build 2021-05-14 09:50:45 +02:00
m68k m68k: Add missing mmap_read_lock() to sys_cacheflush() 2021-05-14 09:50:19 +02:00
microblaze local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
mips MIPS: Loongson64: Use _CACHE_UNCACHED instead of _CACHE_UNCACHED_ACCELERATED 2021-05-19 10:12:55 +02:00
nds32 nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff 2021-04-14 08:41:58 +02:00
nios2 nios2: fixed broken sys_clone syscall 2021-03-04 11:38:16 +01:00
openrisc sched/idle: Fix arch_cpu_idle() vs tracing 2020-11-24 16:47:35 +01:00
parisc parisc: avoid a warning on u8 cast for cmpxchg on u8 pointers 2021-04-14 08:41:59 +02:00
powerpc powerpc/mm: Add cond_resched() while removing hpte mappings 2021-05-19 10:12:56 +02:00
riscv riscv: Fix spelling mistake "SPARSEMEM" to "SPARSMEM" 2021-04-21 13:00:55 +02:00
s390 KVM: s390: extend kvm_s390_shadow_fault to return entry pointer 2021-05-14 09:50:03 +02:00
sh sh: Remove unused HAVE_COPY_THREAD_TLS macro 2021-01-27 11:55:20 +01:00
sparc sparc64: Fix opcode filtering in handling of no fault loads 2021-03-30 14:31:50 +02:00
um um: defer killing userspace on page table update failures 2021-03-04 11:38:42 +01:00
x86 KVM/VMX: Invoke NMI non-IST entry instead of IST entry 2021-05-19 10:12:51 +02:00
xtensa xtensa: move coprocessor_flush to the .text section 2021-04-07 15:00:09 +02:00
.gitignore
Kconfig fanotify: Fix sys_fanotify_mark() on native x86-32 2021-01-17 14:16:59 +01:00