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Mel Gorman af3e4aca47 powerpc: Do not assert pte_locked for hugepage PTE entries 
With CONFIG_DEBUG_VM, an assertion is made when changing the protection
flags of a PTE that the PTE is locked. Huge pages use a different pagetable
format and the assertion is bogus and will always trigger with a bug looking
something like

 Unable to handle kernel paging request for data at address 0xf1a00235800006f8
 Faulting instruction address: 0xc000000000034a80
 Oops: Kernel access of bad area, sig: 11 [#1]
 SMP NR_CPUS=32 NUMA Maple
 Modules linked in: dm_snapshot dm_mirror dm_region_hash
  dm_log dm_mod loop evdev ext3 jbd mbcache sg sd_mod ide_pci_generic
  pata_amd ata_generic ipr libata tg3 libphy scsi_mod windfarm_pid
  windfarm_smu_sat windfarm_max6690_sensor windfarm_lm75_sensor
  windfarm_cpufreq_clamp windfarm_core i2c_powermac
 NIP: c000000000034a80 LR: c000000000034b18 CTR: 0000000000000003
 REGS: c000000003037600 TRAP: 0300   Not tainted (2.6.30-rc3-autokern1)
 MSR: 9000000000009032 <EE,ME,IR,DR>  CR: 28002484  XER: 200fffff
 DAR: f1a00235800006f8, DSISR: 0000000040010000
 TASK = c0000002e54cc740[2960] 'map_high_trunca' THREAD: c000000003034000 CPU: 2
 GPR00: 4000000000000000 c000000003037880 c000000000895d30 c0000002e5a2e500
 GPR04: 00000000a0000000 c0000002edc40880 0000005700000393 0000000000000001
 GPR08: f000000011ac0000 01a00235800006e8 00000000000000f5 f1a00235800006e8
 GPR12: 0000000028000484 c0000000008dd780 0000000000001000 0000000000000000
 GPR16: fffffffffffff000 0000000000000000 00000000a0000000 c000000003037a20
 GPR20: c0000002e5f4ece8 0000000000001000 c0000002edc40880 0000000000000000
 GPR24: c0000002e5f4ece8 0000000000000000 00000000a0000000 c0000002e5f4ece8
 GPR28: 0000005700000393 c0000002e5a2e500 00000000a0000000 c000000003037880
 NIP [c000000000034a80] .assert_pte_locked+0xa4/0xd0
 LR [c000000000034b18] .ptep_set_access_flags+0x6c/0xb4
 Call Trace:
 [c000000003037880] [c000000003037990] 0xc000000003037990 (unreliable)
 [c000000003037910] [c000000000034b18] .ptep_set_access_flags+0x6c/0xb4
 [c0000000030379b0] [c00000000014bef8] .hugetlb_cow+0x124/0x674
 [c000000003037b00] [c00000000014c930] .hugetlb_fault+0x4e8/0x6f8
 [c000000003037c00] [c00000000013443c] .handle_mm_fault+0xac/0x828
 [c000000003037cf0] [c0000000000340a8] .do_page_fault+0x39c/0x584
 [c000000003037e30] [c0000000000057b0] handle_page_fault+0x20/0x5c
 Instruction dump:
 7d29582a 7d200074 7800d182 0b000000 3c004000 3960ffff 780007c6 796b00c4
 7d290214 7929a302 1d290068 7d6b4a14 <800b0010> 7c000074 7800d182 0b000000

This patch fixes the problem by not asseting the PTE is locked for VMAs
backed by huge pages.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-05-18 15:19:04 +10:00
..
40x_mmu.c powerpc/40x: Limit allocable DRAM during early mapping 2008-11-13 10:10:56 -05:00
44x_mmu.c powerpc: rework 4xx PTE access and TLB miss 2008-07-09 13:36:17 -04:00
fault.c powerpc/mm: Rework I$/D$ coherency (v3) 2009-02-11 16:00:10 +11:00
fsl_booke_mmu.c powerpc/mm: Tweak PTE bit combination definitions 2009-03-24 13:47:33 +11:00
gup.c powerpc/mm: Properly wire up get_user_pages_fast() on 32-bit 2009-03-11 17:11:34 +11:00
hash_low_32.S powerpc/mm: Fix _PAGE_COHERENT support on classic ppc32 HW 2009-02-11 16:07:02 +11:00
hash_low_64.S powerpc: Free a PTE bit on ppc64 with 64K pages 2008-06-30 22:30:53 +10:00
hash_native_64.c [POWERPC] Use 1TB segments 2007-10-12 14:05:17 +10:00
hash_utils_64.c powerpc: Fix crash on CPU hotplug 2009-04-22 14:56:34 +10:00
hugetlbpage.c mm: report the MMU pagesize in /proc/pid/smaps 2009-01-06 15:58:58 -08:00
init_32.c powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M 2008-12-23 15:13:29 +11:00
init_64.c powerpc: Get USE_STRICT_MM_TYPECHECKS working again 2008-10-14 10:35:27 +11:00
Makefile powerpc/mm: Rename arch/powerpc/kernel/mmap.c to mmap_64.c 2009-03-24 13:47:33 +11:00
mem.c powerpc: Allow mem=x cmdline to work with 4G+ 2009-05-15 16:43:41 +10:00
mmap_64.c powerpc/mm: Rename arch/powerpc/kernel/mmap.c to mmap_64.c 2009-03-24 13:47:33 +11:00
mmu_context_hash32.c powerpc/mm: Split mmu_context handling 2008-12-21 14:21:15 +11:00
mmu_context_hash64.c powerpc/mm: Split mmu_context handling 2008-12-21 14:21:15 +11:00
mmu_context_nohash.c powerpc/mm: Fix printk type warning in mmu_context_nohash 2009-03-24 13:47:34 +11:00
mmu_decl.h Merge commit 'kumar/kumar-next' into next 2009-01-13 13:59:03 +11:00
numa.c powerpc/numa: Cleanup hot_add_scn_to_nid 2009-02-23 15:53:04 +11:00
pgtable.c powerpc: Do not assert pte_locked for hugepage PTE entries 2009-05-18 15:19:04 +10:00
pgtable_32.c powerpc/mm: Tweak PTE bit combination definitions 2009-03-24 13:47:33 +11:00
pgtable_64.c powerpc: Wire up /proc/vmallocinfo to our ioremap() 2009-03-11 17:10:14 +11:00
ppc_mmu_32.c powerpc/mm: Tweak PTE bit combination definitions 2009-03-24 13:47:33 +11:00
slb.c [POWERPC] vmemmap fixes to use smaller pages 2008-05-15 20:49:25 +10:00
slb_low.S [POWERPC] vmemmap fixes to use smaller pages 2008-05-15 20:49:25 +10:00
slice.c powerpc: is_hugepage_only_range() must account for both 4kB and 64kB slices 2009-01-16 16:15:16 +11:00
stab.c powerpc: Change u64/s64 to a long long integer type 2009-01-13 14:47:59 +11:00
subpage-prot.c [POWERPC] Provide a way to protect 4k subpages when using 64k pages 2008-01-24 10:06:01 +11:00
tlb_hash32.c powerpc/mm: Add SMP support to no-hash TLB handling 2008-12-21 14:21:16 +11:00
tlb_hash64.c cpumask: Use mm_cpumask() wrapper instead of cpu_vm_mask 2009-03-24 13:47:29 +11:00
tlb_nohash.c powerpc/mm: Fix compile warning 2009-04-07 22:11:10 -05:00
tlb_nohash_low.S powerpc: fix for long standing bug noticed by gcc 4.4.0 2009-04-23 08:52:16 -05:00