• Andrew Morton's avatar
    revert "mm: vmalloc use mutex for purge" · 46666d8a
    Andrew Morton authored
    Revert commit e97a630e
    
     ("mm: vmalloc use
    mutex for purge")
    
    Bryan Donlan reports:
    
    : After testing 2.6.29-rc1 on xen-x86 with a btrfs root filesystem, I
    : got the OOPS quoted below and a hard freeze shortly after boot.
    : Boot messages and config are attached.
    :
    : ------------[ cut here ]------------
    : Kernel BUG at c05ef80d [verbose debug info unavailable]
    : invalid opcode: 0000 [#1] SMP
    : last sysfs file: /sys/block/xvdc/size
    : Modules linked in:
    :
    : Pid: 0, comm: swapper Not tainted (2.6.29-rc1 #6)
    : EIP: 0061:[<c05ef80d>] EFLAGS: 00010087 CPU: 2
    : EIP is at schedule+0x7cd/0x950
    : EAX: d5aeca80 EBX: 00000002 ECX: 00000000 EDX: d4cb9a40
    : ESI: c12f5600 EDI: d4cb9a40 EBP: d6033fa4 ESP: d6033ef4
    :  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
    : Process swapper (pid: 0, ti=d6032000 task=d6020b70 task.ti=d6032000)
    : Stack:
    :  000d85bc 00000000 000186a0 00000000 0dd11410 c0105417 c12efe00 0dc367c3
    :  00000011 c0105d46 d5a5d310 deadbeef d4cb9a40 c07cc600 c05f1340 c12e0060
    :  deadbeef d6020b70 d6020d08 00000002 c014377d 00000000 c12f5600 00002c22
    : Call Trace:
    :  [<c0105417>] xen_force_evtchn_callback+0x17/0x30
    :  [<c0105d46>] check_events+0x8/0x12
    :  [<c05f1340>] _spin_unlock_irqrestore+0x20/0x40
    :  [<c014377d>] hrtimer_start_range_ns+0x12d/0x2e0
    :  [<c014c4f6>] tick_nohz_restart_sched_tick+0x146/0x160
    :  [<c0107485>] cpu_idle+0xa5/0xc0
    
    and bisected it to this commit.
    
    Let's remove it now while we have a think about the problem.
    
    Reported-by: default avatarBryan Donlan <bdonlan@gmail.com>
    Tested-by: default avatarChristophe Saout <christophe@saout.de>
    Cc: Nick Piggin <nickpiggin@yahoo.com.au>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Jeremy Fitzhardinge <jeremy@goop.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    46666d8a