1. 09 6月, 2009 4 次提交
    • B
      powerpc: Set init_bootmem_done on NUMA platforms as well · d3f6204a
      Benjamin Herrenschmidt 提交于
      For some obscure reason, we only set init_bootmem_done after initializing
      bootmem when NUMA isn't enabled. We even document this next to the declaration
      of that global in system.h which of course I didn't read before I had to
      debug why some WIP code wasn't working properly...
      
      This patch changes it so that we always set it after bootmem is initialized
      which should have always been the case... go figure !
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      d3f6204a
    • B
      powerpc/mm: Fix a AB->BA deadlock scenario with nohash MMU context lock · b46b6942
      Benjamin Herrenschmidt 提交于
      The MMU context_lock can be taken from switch_mm() while the
      rq->lock is held. The rq->lock can also be taken from interrupts,
      thus if we get interrupted in destroy_context() with the context
      lock held and that interrupt tries to take the rq->lock, there's
      a possible deadlock scenario with another CPU having the rq->lock
      and calling switch_mm() which takes our context lock.
      
      The fix is to always ensure interrupts are off when taking our
      context lock. The switch_mm() path is already good so this fixes
      the destroy_context() path.
      
      While at it, turn the context lock into a new style spinlock.
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      b46b6942
    • B
      powerpc/mm: Fix some SMP issues with MMU context handling · 3035c863
      Benjamin Herrenschmidt 提交于
      This patch fixes a couple of issues that can happen as a result
      of steal_context() dropping the context_lock when all possible
      PIDs are ineligible for stealing (hopefully an extremely hard to
      hit occurence).
      
      This case exposes the possibility of a stale context_mm[] entry
      to be seen since destroy_context() doesn't clear it and the free
      map isn't re-tested. It also means steal_context() will not notice
      a context freed while the lock was help, thus possibly trying to
      steal a context when a free one was available.
      
      This fixes it by always returning to the caller from steal_context
      when it dropped the lock with a return value that causes the
      caller to re-samble the number of free contexts, along with
      properly clearing the context_mm[] array for destroyed contexts.
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      3035c863
    • R
      powerpc: Add PTRACE_SINGLEBLOCK support · ec097c84
      Roland McGrath 提交于
      Reworked by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      
      This adds block-step support on powerpc, including a PTRACE_SINGLEBLOCK
      request for ptrace.
      
      The BookE implementation is tweaked to fire a single step after a
      block step in order to mimmic the server behaviour.
      Signed-off-by: NRoland McGrath <roland@redhat.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      ec097c84
  2. 07 6月, 2009 5 次提交
  3. 02 6月, 2009 9 次提交
  4. 29 5月, 2009 1 次提交
  5. 28 5月, 2009 5 次提交
  6. 27 5月, 2009 16 次提交