Hugh Dickins b9980cdcf2 mm: fix UP THP spin_is_locked BUGs ...

Fix CONFIG_TRANSPARENT_HUGEPAGE=y CONFIG_SMP=n CONFIG_DEBUG_VM=y
CONFIG_DEBUG_SPINLOCK=n kernel: spin_is_locked() is then always false,
and so triggers some BUGs in Transparent HugePage codepaths.

asm-generic/bug.h mentions this problem, and provides a WARN_ON_SMP(x);
but being too lazy to add VM_BUG_ON_SMP, BUG_ON_SMP, WARN_ON_SMP_ONCE,
VM_WARN_ON_SMP_ONCE, just test NR_CPUS != 1 in the existing VM_BUG_ONs.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2012-02-08 19:03:51 -08:00

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backing-dev.c

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bootmem.c

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bounce.c

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cleancache.c

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compaction.c

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debug-pagealloc.c

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dmapool.c

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fadvise.c

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failslab.c

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filemap_xip.c

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filemap.c

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fremap.c

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highmem.c

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huge_memory.c

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hugetlb.c

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hwpoison-inject.c

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init-mm.c

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internal.h

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Kconfig

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Kconfig.debug

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kmemcheck.c

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kmemleak-test.c

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kmemleak.c

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ksm.c

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maccess.c

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madvise.c

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Makefile

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memblock.c

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memcontrol.c

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memory_hotplug.c

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memory-failure.c

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memory.c

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mempolicy.c

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mempool.c

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migrate.c

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mincore.c

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mlock.c

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mm_init.c

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mmap.c

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mmu_context.c

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mmu_notifier.c

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mmzone.c

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mprotect.c

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mremap.c

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msync.c

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nobootmem.c

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nommu.c

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oom_kill.c

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page_alloc.c

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page_cgroup.c

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page_io.c

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page_isolation.c

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page-writeback.c

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pagewalk.c

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percpu-km.c

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percpu-vm.c

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percpu.c

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pgtable-generic.c

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prio_tree.c

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process_vm_access.c

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quicklist.c

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readahead.c

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rmap.c

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shmem.c

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slab.c

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slob.c

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slub.c

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sparse-vmemmap.c

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sparse.c

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swap_state.c

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swap.c

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swapfile.c

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thrash.c

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truncate.c

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util.c

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vmalloc.c

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vmscan.c

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vmstat.c

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