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    SubjectRe: [-mm] BUG: sleeping function called from invalid context at include/linux/pagemap.h:290
    > Li-san, Could you try to below patch on your environment?
    >

    I've tested it, so UNEVICTABLE_LRU is disabled and the bug disapeared.

    >
    > ----------------------
    > pagewalk use pte_offset_map().
    > pte_offset_map() use kmap_atomic().
    > __munlock_pte_handler() use lock_page().
    >
    > So, in CONFIG_HIGHPTE=y, following error happend.
    >
    >
    > BUG: sleeping function called from invalid context at include/linux/pagemap.h:290
    > in_atomic():1, irqs_disabled():0
    > no locks held by gpg-agent/2134.
    > Pid: 2134, comm: gpg-agent Not tainted 2.6.26-rc8-mm1 #11
    > [<c0421d38>] __might_sleep+0xbe/0xc5
    > [<c04770a2>] __munlock_pte_handler+0x3c/0x9e
    > [<c047c11f>] walk_page_range+0x15b/0x1b4
    > [<c0477048>] __munlock_vma_pages_range+0x4e/0x5b
    > [<c0476f0c>] ? __munlock_pmd_handler+0x0/0x10
    > [<c0477066>] ? __munlock_pte_handler+0x0/0x9e
    > [<c0477064>] munlock_vma_pages_range+0xf/0x11
    > [<c0477dcb>] exit_mmap+0x32/0xf2
    > [<c042ac12>] ? exit_mm+0xc7/0xda
    > [<c042732a>] mmput+0x3a/0x8b
    > [<c042ac20>] exit_mm+0xd5/0xda
    > [<c042bf6a>] do_exit+0x1fb/0x5d5
    > [<c045c4df>] ? audit_syscall_exit+0x2aa/0x2c5
    > [<c042c3a3>] do_group_exit+0x5f/0x88
    > [<c042c3db>] sys_exit_group+0xf/0x11
    > [<c0403956>] syscall_call+0x7/0xb
    >
    > then, this feature should be disabled on 32BIT until fixed above problem.
    >
    > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    >
    > ---
    > mm/Kconfig | 1 +
    > 1 file changed, 1 insertion(+)
    >
    > Index: b/mm/Kconfig
    > ===================================================================
    > --- a/mm/Kconfig
    > +++ b/mm/Kconfig
    > @@ -216,6 +216,7 @@ config PAGE_WALKER
    > config UNEVICTABLE_LRU
    > bool "Add LRU list to track non-evictable pages"
    > default y
    > + depends on 64BIT
    > select PAGE_WALKER
    > help
    > Keeps unevictable pages off of the active and inactive pageout
    >


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