1. 15 Mar, 2012 2 commits
    • Viresh Kumar's avatar
      MAINTAINERS: update ST's Mailing list for SPEAr · fbfa0748
      Viresh Kumar authored
      
      
      We have created a ST's Mailing list for SPEAr.  This can be accessed
      from non-st email ids.  I want people to cc this list, when they have
      changes specific to SPEAr.  So, its better to get this updated in
      MAINTAINERS file.
      
      linux-arm-kernel@lists.infradead.org is also added for SPEAr.
      Signed-off-by: default avatarViresh Kumar <viresh.kumar@st.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fbfa0748
    • Hugh Dickins's avatar
      memcg: free mem_cgroup by RCU to fix oops · 59927fb9
      Hugh Dickins authored
      
      
      After fixing the GPF in mem_cgroup_lru_del_list(), three times one
      machine running a similar load (moving and removing memcgs while
      swapping) has oopsed in mem_cgroup_zone_nr_lru_pages(), when retrieving
      memcg zone numbers for get_scan_count() for shrink_mem_cgroup_zone():
      this is where a struct mem_cgroup is first accessed after being chosen
      by mem_cgroup_iter().
      
      Just what protects a struct mem_cgroup from being freed, in between
      mem_cgroup_iter()'s css_get_next() and its css_tryget()? css_tryget()
      fails once css->refcnt is zero with CSS_REMOVED set in flags, yes: but
      what if that memory is freed and reused for something else, which sets
      "refcnt" non-zero? Hmm, and scope for an indefinite freeze if refcnt is
      left at zero but flags are cleared.
      
      It's tempting to move the css_tryget() into css_get_next(), to make it
      really "get" the css, but I don't think that actually solves anything:
      the same difficulty in moving from css_id found to stable css remains.
      
      But we already have rcu_read_lock() around the two, so it's easily fixed
      if __mem_cgroup_free() just uses kfree_rcu() to free mem_cgroup.
      
      However, a big struct mem_cgroup is allocated with vzalloc() instead of
      kzalloc(), and we're not allowed to vfree() at interrupt time: there
      doesn't appear to be a general vfree_rcu() to help with this, so roll
      our own using schedule_work().  The compiler decently removes
      vfree_work() and vfree_rcu() when the config doesn't need them.
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Ying Han <yinghan@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      59927fb9
  2. 14 Mar, 2012 5 commits
  3. 13 Mar, 2012 10 commits
  4. 12 Mar, 2012 19 commits
  5. 11 Mar, 2012 4 commits