)]}'
{
  "log": [
    {
      "commit": "d80e731ecab420ddcb79ee9d0ac427acbc187b4b",
      "tree": "e96a660b75b5bee8ae2c315878ec917b9c0da446",
      "parents": [
        "855a85f704026d5fe7de94fb1b765fe03404507f"
      ],
      "author": {
        "name": "Oleg Nesterov",
        "email": "oleg@redhat.com",
        "time": "Fri Feb 24 20:07:11 2012 +0100"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Fri Feb 24 11:42:50 2012 -0800"
      },
      "message": "epoll: introduce POLLFREE to flush -\u003esignalfd_wqh before kfree()\n\nThis patch is intentionally incomplete to simplify the review.\nIt ignores ep_unregister_pollwait() which plays with the same wqh.\nSee the next change.\n\nepoll assumes that the EPOLL_CTL_ADD\u0027ed file controls everything\nf_op-\u003epoll() needs. In particular it assumes that the wait queue\ncan\u0027t go away until eventpoll_release(). This is not true in case\nof signalfd, the task which does EPOLL_CTL_ADD uses its -\u003esighand\nwhich is not connected to the file.\n\nThis patch adds the special event, POLLFREE, currently only for\nepoll. It expects that init_poll_funcptr()\u0027ed hook should do the\nnecessary cleanup. Perhaps it should be defined as EPOLLFREE in\neventpoll.\n\n__cleanup_sighand() is changed to do wake_up_poll(POLLFREE) if\n-\u003esignalfd_wqh is not empty, we add the new signalfd_cleanup()\nhelper.\n\nep_poll_callback(POLLFREE) simply does list_del_init(task_list).\nThis make this poll entry inconsistent, but we don\u0027t care. If you\nshare epoll fd which contains our sigfd with another process you\nshould blame yourself. signalfd is \"really special\". I simply do\nnot know how we can define the \"right\" semantics if it used with\nepoll.\n\nThe main problem is, epoll calls signalfd_poll() once to establish\nthe connection with the wait queue, after that signalfd_poll(NULL)\nreturns the different/inconsistent results depending on who does\nEPOLL_CTL_MOD/signalfd_read/etc. IOW: apart from sigmask, signalfd\nhas nothing to do with the file, it works with the current thread.\n\nIn short: this patch is the hack which tries to fix the symptoms.\nIt also assumes that nobody can take tasklist_lock under epoll\nlocks, this seems to be true.\n\nNote:\n\n\t- we do not have wake_up_all_poll() but wake_up_poll()\n\t  is fine, poll/epoll doesn\u0027t use WQ_FLAG_EXCLUSIVE.\n\n\t- signalfd_cleanup() uses POLLHUP along with POLLFREE,\n\t  we need a couple of simple changes in eventpoll.c to\n\t  make sure it can\u0027t be \"lost\".\n\nReported-by: Maxime Bizon \u003cmbizon@freebox.fr\u003e\nCc: \u003cstable@kernel.org\u003e\nSigned-off-by: Oleg Nesterov \u003coleg@redhat.com\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "04dd08b45be863f016df648a149ade1411608d00",
      "tree": "9787f5d7b1fb808873e68209df9496e54509dab4",
      "parents": [
        "99eaf3c45fe806c4a7f39b9be4a1bd0dfc617699"
      ],
      "author": {
        "name": "Stephen Rothwell",
        "email": "sfr@canb.auug.org.au",
        "time": "Thu May 10 22:22:40 2007 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Fri May 11 08:29:34 2007 -0700"
      },
      "message": "Consolidate asm/poll.h\n\nThese files are almost all the same.\n\nThis patch could be made even simpler if we don\u0027t mind POLLREMOVE turning\nup in a few architectures that didn\u0027t have it previously (which should be\nOK as POLLREMOVE is not used anywhere in the current tree).\n\nSigned-off-by: Stephen Rothwell \u003csfr@canb.auug.org.au\u003e\nCc: \u003clinux-arch@vger.kernel.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    }
  ]
}