linux/arch/powerpc/mm
Robert Jennings 3be7db6ab4 powerpc: VPHN topology change updates all siblings
When an associativity level change is found for one thread, the
siblings threads need to be updated as well.  This is done today
for PRRN in stage_topology_update() but is missing for VPHN in
update_cpu_associativity_changes_mask().  This patch will correctly
update all thread siblings during a topology change.

Without this patch a topology update can result in a CPU in
init_sched_groups_power() getting stuck indefinitely in a loop.

This loop is built in build_sched_groups(). As a result of the thread
moving to a node separate from its siblings the struct sched_group will
have its next pointer set to point to itself rather than the sched_group
struct of the next thread.  This happens because we have a domain without
the SD_OVERLAP flag, which is correct, and a topology that doesn't conform
with reality (threads on the same core assigned to different numa nodes).
When this list is traversed by init_sched_groups_power() it will reach
the thread's sched_group structure and loop indefinitely; the cpu will
be stuck at this point.

The bug was exposed when VPHN was enabled in commit b7abef0 (v3.9).

Cc: <stable@vger.kernel.org> [v3.9+]
Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-08-01 13:11:47 +10:00
..
40x_mmu.c memblock: Remove rmo_size, burry it in arch/powerpc where it belongs 2010-08-05 12:56:08 +10:00
44x_mmu.c powerpc: Delete __cpuinit usage from all users 2013-07-01 11:10:36 +10:00
Makefile powerpc/THP: Add code to handle HPTE faults for hugepages 2013-06-21 16:01:56 +10:00
dma-noncoherent.c powerpc: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:14 +08:00
fault.c powerpc: Exception hooks for context tracking subsystem 2013-05-14 16:00:19 +10:00
fsl_booke_mmu.c powerpc/fsl-booke: Fixup calc_cam_sz to support MMU v2 2012-03-15 12:12:19 -05:00
gup.c powerpc: Prevent gcc to re-read the pagetables 2013-06-21 16:01:56 +10:00
hash_low_32.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
hash_low_64.S powerpc/mm: handle hugepage size correctly when invalidating hpte entries 2013-06-21 16:01:52 +10:00
hash_native_64.c powerpc/mm: Use the correct SLB(LLP) encoding in tlbie instruction 2013-07-24 14:42:24 +10:00
hash_utils_64.c powerpc: Delete __cpuinit usage from all users 2013-07-01 11:10:36 +10:00
highmem.c mm: fix race in kunmap_atomic() 2010-10-27 18:03:05 -07:00
hugepage-hash64.c powerpc: Make linux pagetable walk safe with THP enabled 2013-06-21 16:01:56 +10:00
hugetlbpage-book3e.c powerpc/book3e: Change hugetlb preload to take vma argument 2011-12-07 16:26:24 +11:00
hugetlbpage-hash64.c powerpc/mm: handle hugepage size correctly when invalidating hpte entries 2013-06-21 16:01:52 +10:00
hugetlbpage.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-07-04 10:29:23 -07:00
icswx.c powerpc: Fix typo "CONFIG_ICSWX_PID" 2013-04-18 13:03:54 +10:00
icswx.h powerpc/icswx: Fix race condition with IPI setting ACOP 2012-03-07 17:06:09 +11:00
icswx_pid.c powerpc: Split ICSWX ACOP and PID processing 2011-11-25 14:11:27 +11:00
init_32.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
init_64.c powerpc/THP: Double the PMD table size for THP 2013-06-21 16:01:53 +10:00
mem.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-07-04 10:29:23 -07:00
mmap.c mm: remove free_area_cache 2013-07-10 18:11:34 -07:00
mmu_context_hash32.c powerpc: include export.h for files using EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:30:38 -04:00
mmu_context_hash64.c powerpc: Reduce PTE table memory wastage 2013-04-30 16:00:07 +10:00
mmu_context_nohash.c powerpc: Delete __cpuinit usage from all users 2013-07-01 11:10:36 +10:00
mmu_decl.h powerpc/fsl-booke: Fix setup_initial_memory_limit to not blindly map 2011-10-11 23:30:41 -05:00
numa.c powerpc: VPHN topology change updates all siblings 2013-08-01 13:11:47 +10:00
pgtable.c powerpc: disable assert_pte_locked for collapse_huge_page 2013-06-21 16:01:57 +10:00
pgtable_32.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
pgtable_64.c powerpc: Optimize hugepage invalidate 2013-06-21 16:01:58 +10:00
ppc_mmu_32.c memblock: Remove rmo_size, burry it in arch/powerpc where it belongs 2010-08-05 12:56:08 +10:00
slb.c powerpc: Remove FW_FEATURE ISERIES from arch code 2012-03-21 11:16:11 +11:00
slb_low.S powerpc: Rename USER_ESID_BITS* to ESID_BITS* 2013-03-17 12:45:44 +11:00
slice.c mm: use vm_unmapped_area() on powerpc architecture 2013-04-30 11:05:17 +10:00
stab.c powerpc/mm: Remove uses of abs_to_virt() and virt_to_abs() 2012-09-05 15:19:31 +10:00
subpage-prot.c powerpc: split hugepage when using subpage protection 2013-06-21 16:01:57 +10:00
tlb_hash32.c powerpc: include export.h for files using EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:30:38 -04:00
tlb_hash64.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-07-04 10:29:23 -07:00
tlb_low_64e.S powerpc/booke64: Use SPRG0/3 scratch for bolted TLB miss & crit int 2012-09-05 15:35:52 +10:00
tlb_nohash.c powerpc: Delete __cpuinit usage from all users 2013-07-01 11:10:36 +10:00
tlb_nohash_low.S powerpc/47x: Use the new ppc-opcode infrastructure 2012-11-15 12:59:24 +11:00