)]}'
{
  "log": [
    {
      "commit": "58a69cb47ec6991bf006a3e5d202e8571b0327a4",
      "tree": "56abdf817649c352f70bff3263f9351ed6c42062",
      "parents": [
        "7576958a9d5a4a677ad7dd40901cdbb6c1110c98"
      ],
      "author": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Wed Feb 16 09:25:31 2011 +0100"
      },
      "committer": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Wed Feb 16 17:48:59 2011 +0100"
      },
      "message": "workqueue, freezer: unify spelling of \u0027freeze\u0027 + \u0027able\u0027 to \u0027freezable\u0027\n\nThere are two spellings in use for \u0027freeze\u0027 + \u0027able\u0027 - \u0027freezable\u0027 and\n\u0027freezeable\u0027.  The former is the more prominent one.  The latter is\nmostly used by workqueue and in a few other odd places.  Unify the\nspelling to \u0027freezable\u0027.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReported-by: Alan Stern \u003cstern@rowland.harvard.edu\u003e\nAcked-by: \"Rafael J. Wysocki\" \u003crjw@sisk.pl\u003e\nAcked-by: Greg Kroah-Hartman \u003cgregkh@suse.de\u003e\nAcked-by: Dmitry Torokhov \u003cdtor@mail.ru\u003e\nCc: David Woodhouse \u003cdwmw2@infradead.org\u003e\nCc: Alex Dubov \u003coakad@yahoo.com\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nCc: Steven Whitehouse \u003cswhiteho@redhat.com\u003e\n"
    },
    {
      "commit": "5a7aadfe2fcb0f69e2acc1fbefe22a096e792fc9",
      "tree": "dc1b649fc6aa05ecd25cab23e464894e660830d5",
      "parents": [
        "4f598458ea4450f53e8ed929ee4e66b3404a7286"
      ],
      "author": {
        "name": "Matt Helsley",
        "email": "matthltc@us.ibm.com",
        "time": "Fri Mar 26 23:51:44 2010 +0100"
      },
      "committer": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Fri Mar 26 23:51:44 2010 +0100"
      },
      "message": "Freezer: Fix buggy resume test for tasks frozen with cgroup freezer\n\nWhen the cgroup freezer is used to freeze tasks we do not want to thaw\nthose tasks during resume. Currently we test the cgroup freezer\nstate of the resuming tasks to see if the cgroup is FROZEN.  If so\nthen we don\u0027t thaw the task. However, the FREEZING state also indicates\nthat the task should remain frozen.\n\nThis also avoids a problem pointed out by Oren Ladaan: the freezer state\ntransition from FREEZING to FROZEN is updated lazily when userspace reads\nor writes the freezer.state file in the cgroup filesystem. This means that\nresume will thaw tasks in cgroups which should be in the FROZEN state if\nthere is no read/write of the freezer.state file to trigger this\ntransition before suspend.\n\nNOTE: Another \"simple\" solution would be to always update the cgroup\nfreezer state during resume. However it\u0027s a bad choice for several reasons:\nUpdating the cgroup freezer state is somewhat expensive because it requires\nwalking all the tasks in the cgroup and checking if they are each frozen.\nWorse, this could easily make resume run in N^2 time where N is the number\nof tasks in the cgroup. Finally, updating the freezer state from this code\npath requires trickier locking because of the way locks must be ordered.\n\nInstead of updating the freezer state we rely on the fact that lazy\nupdates only manage the transition from FREEZING to FROZEN. We know that\na cgroup with the FREEZING state may actually be FROZEN so test for that\nstate too. This makes sense in the resume path even for partially-frozen\ncgroups -- those that really are FREEZING but not FROZEN.\n\nReported-by: Oren Ladaan \u003corenl@cs.columbia.edu\u003e\nSigned-off-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: stable@kernel.org\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\n"
    },
    {
      "commit": "00c2e63c31d0f431952ff2a671c5c6997dd4f8b2",
      "tree": "2277b400fef79e55c13d7045aa63d5bed9ad5883",
      "parents": [
        "80a6a2cf3bebcf20285cf05373b9c5ec96816577"
      ],
      "author": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Wed Oct 29 14:00:53 2008 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Thu Oct 30 11:38:45 2008 -0700"
      },
      "message": "freezer_cg: use thaw_process() in unfreeze_cgroup()\n\nDon\u0027t duplicate the implementation of thaw_process().\n\n[akpm@linux-foundation.org: make __thaw_process() static]\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Cedric Le Goater \u003cclg@fr.ibm.com\u003e\nAcked-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "dc52ddc0e6f45b04780b26fc0813509f8e798c42",
      "tree": "384826e9fab4e434bc5c85ce744470ae472e52c3",
      "parents": [
        "8174f1503f4bf7e9a14b3fbbfdb30c6be6e29f77"
      ],
      "author": {
        "name": "Matt Helsley",
        "email": "matthltc@us.ibm.com",
        "time": "Sat Oct 18 20:27:21 2008 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Mon Oct 20 08:52:34 2008 -0700"
      },
      "message": "container freezer: implement freezer cgroup subsystem\n\nThis patch implements a new freezer subsystem in the control groups\nframework.  It provides a way to stop and resume execution of all tasks in\na cgroup by writing in the cgroup filesystem.\n\nThe freezer subsystem in the container filesystem defines a file named\nfreezer.state.  Writing \"FROZEN\" to the state file will freeze all tasks\nin the cgroup.  Subsequently writing \"RUNNING\" will unfreeze the tasks in\nthe cgroup.  Reading will return the current state.\n\n* Examples of usage :\n\n   # mkdir /containers/freezer\n   # mount -t cgroup -ofreezer freezer  /containers\n   # mkdir /containers/0\n   # echo $some_pid \u003e /containers/0/tasks\n\nto get status of the freezer subsystem :\n\n   # cat /containers/0/freezer.state\n   RUNNING\n\nto freeze all tasks in the container :\n\n   # echo FROZEN \u003e /containers/0/freezer.state\n   # cat /containers/0/freezer.state\n   FREEZING\n   # cat /containers/0/freezer.state\n   FROZEN\n\nto unfreeze all tasks in the container :\n\n   # echo RUNNING \u003e /containers/0/freezer.state\n   # cat /containers/0/freezer.state\n   RUNNING\n\nThis is the basic mechanism which should do the right thing for user space\ntask in a simple scenario.\n\nIt\u0027s important to note that freezing can be incomplete.  In that case we\nreturn EBUSY.  This means that some tasks in the cgroup are busy doing\nsomething that prevents us from completely freezing the cgroup at this\ntime.  After EBUSY, the cgroup will remain partially frozen -- reflected\nby freezer.state reporting \"FREEZING\" when read.  The state will remain\n\"FREEZING\" until one of these things happens:\n\n\t1) Userspace cancels the freezing operation by writing \"RUNNING\" to\n\t\tthe freezer.state file\n\t2) Userspace retries the freezing operation by writing \"FROZEN\" to\n\t\tthe freezer.state file (writing \"FREEZING\" is not legal\n\t\tand returns EIO)\n\t3) The tasks that blocked the cgroup from entering the \"FROZEN\"\n\t\tstate disappear from the cgroup\u0027s set of tasks.\n\n[akpm@linux-foundation.org: coding-style fixes]\n[akpm@linux-foundation.org: export thaw_process]\nSigned-off-by: Cedric Le Goater \u003cclg@fr.ibm.com\u003e\nSigned-off-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nAcked-by: Serge E. Hallyn \u003cserue@us.ibm.com\u003e\nTested-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "8174f1503f4bf7e9a14b3fbbfdb30c6be6e29f77",
      "tree": "a8df1ebd62255dd231452b3f72782604e8919991",
      "parents": [
        "83224b08372be48d5fcefedc4886457da29130c8"
      ],
      "author": {
        "name": "Matt Helsley",
        "email": "matthltc@us.ibm.com",
        "time": "Sat Oct 18 20:27:19 2008 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Mon Oct 20 08:52:33 2008 -0700"
      },
      "message": "container freezer: make refrigerator always available\n\nNow that the TIF_FREEZE flag is available in all architectures, extract\nthe refrigerator() and freeze_task() from kernel/power/process.c and make\nit available to all.\n\nThe refrigerator() can now be used in a control group subsystem\nimplementing a control group freezer.\n\nSigned-off-by: Cedric Le Goater \u003cclg@fr.ibm.com\u003e\nSigned-off-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nAcked-by: Serge E. Hallyn \u003cserue@us.ibm.com\u003e\nTested-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: \"Rafael J. Wysocki\" \u003crjw@sisk.pl\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "ebb12db51f6c13b30752fcf506baad4c617b153c",
      "tree": "55c08b82463ffd5b78a8bc4a4748261b02391593",
      "parents": [
        "d20a4dca47d2cd027ed58a13f91b424affd1f449"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Wed Jun 11 22:04:29 2008 +0200"
      },
      "committer": {
        "name": "Andi Kleen",
        "email": "andi@basil.nowhere.org",
        "time": "Wed Jul 16 23:27:03 2008 +0200"
      },
      "message": "Freezer: Introduce PF_FREEZER_NOSIG\n\nThe freezer currently attempts to distinguish kernel threads from\nuser space tasks by checking if their mm pointer is unset and it\ndoes not send fake signals to kernel threads.  However, there are\nkernel threads, mostly related to networking, that behave like\nuser space tasks and may want to be sent a fake signal to be frozen.\n\nIntroduce the new process flag PF_FREEZER_NOSIG that will be set\nby default for all kernel threads and make the freezer only send\nfake signals to the tasks having PF_FREEZER_NOSIG unset.  Provide\nthe set_freezable_with_signal() function to be called by the kernel\nthreads that want to be sent a fake signal for freezing.\n\nThis patch should not change the freezer\u0027s observable behavior.\n\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nSigned-off-by: Andi Kleen \u003cak@linux.intel.com\u003e\nAcked-by: Pavel Machek \u003cpavel@suse.cz\u003e\nSigned-off-by: Len Brown \u003clen.brown@intel.com\u003e\n"
    },
    {
      "commit": "e42837bcd35b75bb59ae5d3e62f87be1aeeb05c3",
      "tree": "aa9666b080dc75ef3fa27992f042a422f7a979b7",
      "parents": [
        "2e1318956ce6bf149af5c5e98499b5cd99f99c89"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Thu Oct 18 03:04:45 2007 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Thu Oct 18 14:37:19 2007 -0700"
      },
      "message": "freezer: introduce freezer-friendly waiting macros\n\nIntroduce freezer-friendly wrappers around wait_event_interruptible() and\nwait_event_interruptible_timeout(), originally defined in \u003clinux/wait.h\u003e, to\nbe used in freezable kernel threads.  Make some of the freezable kernel\nthreads use them.\n\nThis is necessary for the freezer to stop sending signals to kernel threads,\nwhich is implemented in the next patch.\n\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nAcked-by: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: Nigel Cunningham \u003cnigel@nigel.suspend2.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "296699de6bdc717189a331ab6bbe90e05c94db06",
      "tree": "53c847ecc8cce11952502921844052e44ca60d5e",
      "parents": [
        "b0cb1a19d05b8ea8611a9ef48a17fe417f1832e6"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Sun Jul 29 23:27:18 2007 +0200"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Sun Jul 29 16:45:38 2007 -0700"
      },
      "message": "Introduce CONFIG_SUSPEND for suspend-to-Ram and standby\n\nIntroduce CONFIG_SUSPEND representing the ability to enter system sleep\nstates, such as the ACPI S3 state, and allow the user to choose SUSPEND\nand HIBERNATION independently of each other.\n\nMake HOTPLUG_CPU be selected automatically if SUSPEND or HIBERNATION has\nbeen chosen and the kernel is intended for SMP systems.\n\nAlso, introduce CONFIG_PM_SLEEP which is automatically selected if\nCONFIG_SUSPEND or CONFIG_HIBERNATION is set and use it to select the\ncode needed for both suspend and hibernation.\n\nThe top-level power management headers and the ACPI code related to\nsuspend and hibernation are modified to use the new definitions (the\nchanges in drivers/acpi/sleep/main.c are, mostly, moving code to reduce\nthe number of ifdefs).\n\nThere are many other files in which CONFIG_PM can be replaced with\nCONFIG_PM_SLEEP or even with CONFIG_SUSPEND, but they can be updated in\nthe future.\n\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "0c1eecfb345401629aa57c9d3b077273e56c45a7",
      "tree": "522d7090966c6e70f3147c30e3308781e0309938",
      "parents": [
        "b1457bcc3a00a0446c7f6e2f22fd24b6d8d0a309"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Thu Jul 19 01:47:33 2007 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Thu Jul 19 10:04:42 2007 -0700"
      },
      "message": "Freezer: avoid freezing kernel threads prematurely\n\nKernel threads should not have TIF_FREEZE set when user space processes are\nbeing frozen, since otherwise some of them might be frozen prematurely.\nTo prevent this from happening we can (1) make exit_mm() unset TIF_FREEZE\nunconditionally just after clearing tsk-\u003emm and (2) make try_to_freeze_tasks()\ncheck if p-\u003emm is different from zero and PF_BORROWED_MM is unset in p-\u003eflags\nwhen user space processes are to be frozen.\n\nNamely, when user space processes are being frozen, we only should set\nTIF_FREEZE for tasks that have p-\u003emm different from NULL and don\u0027t have\nPF_BORROWED_MM set in p-\u003eflags.  For this reason task_lock() must be used to\nprevent try_to_freeze_tasks() from racing with use_mm()/unuse_mm(), in which\np-\u003emm and p-\u003eflags.PF_BORROWED_MM are changed under task_lock(p).  Also, we\nneed to prevent the following scenario from happening:\n\n* daemonize() is called by a task spawned from a user space code path\n* freezer checks if the task has p-\u003emm set and the result is positive\n* task enters exit_mm() and clears its TIF_FREEZE\n* freezer sets TIF_FREEZE for the task\n* task calls try_to_freeze() and goes to the refrigerator, which is wrong at\n  that point\n\nThis requires us to acquire task_lock(p) before p-\u003eflags.PF_BORROWED_MM and\np-\u003emm are examined and release it after TIF_FREEZE is set for p (or it turns\nout that TIF_FREEZE should not be set).\n\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nCc: Gautham R Shenoy \u003cego@in.ibm.com\u003e\nCc: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: Nigel Cunningham \u003cnigel@nigel.suspend2.net\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "831441862956fffa17b9801db37e6ea1650b0f69",
      "tree": "b0334921341f8f1734bdd3243de76d676329d21c",
      "parents": [
        "787d2214c19bcc9b6ac48af0ce098277a801eded"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Tue Jul 17 04:03:35 2007 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Tue Jul 17 10:23:02 2007 -0700"
      },
      "message": "Freezer: make kernel threads nonfreezable by default\n\nCurrently, the freezer treats all tasks as freezable, except for the kernel\nthreads that explicitly set the PF_NOFREEZE flag for themselves.  This\napproach is problematic, since it requires every kernel thread to either\nset PF_NOFREEZE explicitly, or call try_to_freeze(), even if it doesn\u0027t\ncare for the freezing of tasks at all.\n\nIt seems better to only require the kernel threads that want to or need to\nbe frozen to use some freezer-related code and to remove any\nfreezer-related code from the other (nonfreezable) kernel threads, which is\ndone in this patch.\n\nThe patch causes all kernel threads to be nonfreezable by default (ie.  to\nhave PF_NOFREEZE set by default) and introduces the set_freezable()\nfunction that should be called by the freezable kernel threads in order to\nunset PF_NOFREEZE.  It also makes all of the currently freezable kernel\nthreads call set_freezable(), so it shouldn\u0027t cause any (intentional)\nchange of behaviour to appear.  Additionally, it updates documentation to\ndescribe the freezing of tasks more accurately.\n\n[akpm@linux-foundation.org: build fixes]\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nAcked-by: Nigel Cunningham \u003cnigel@nigel.suspend2.net\u003e\nCc: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: Gautham R Shenoy \u003cego@in.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "88f18ba028b5939bb6f77bd690e5ad8d01bb24cc",
      "tree": "eea3f79f5098f7b45723f842208b44f860f0fb71",
      "parents": [
        "5fcc57f2d5d558056668159f9153bf21d2c53d16"
      ],
      "author": {
        "name": "Gautham R Shenoy",
        "email": "ego@in.ibm.com",
        "time": "Wed May 23 13:57:29 2007 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Wed May 23 20:14:11 2007 -0700"
      },
      "message": "freezer: move frozen_process() to kernel/power/process.c\n\nOther than refrigerator, no one else calls frozen_process().  So move it from\ninclude/linux/freezer.h to kernel/power/process.c.\n\nAlso, since a task can be marked as frozen by itself, we don\u0027t need to pass\nthe (struct task_struct *p) parameter to frozen_process().\n\nSigned-off-by: Gautham R Shenoy \u003cego@in.ibm.com\u003e\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "5fcc57f2d5d558056668159f9153bf21d2c53d16",
      "tree": "aa81c453b093f051bf775cd8fb557df9d2f79543",
      "parents": [
        "a076e4bca2fdabb9e45d86722cc72c0944da5f94"
      ],
      "author": {
        "name": "Gautham R Shenoy",
        "email": "ego@in.ibm.com",
        "time": "Wed May 23 13:57:28 2007 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Wed May 23 20:14:11 2007 -0700"
      },
      "message": "freezer: fix PF_NOFREEZE vs freezeable race\n\nThis patch fixes the race pointed out by Oleg Nesterov.\n\n* Freezer marks a thread as freezeable.\n* The thread now marks itself PF_NOFREEZE, but it will be frozen on\n  on calling try_to_freeze(). Thus the task is frozen, even though it doesn\u0027t\n  want to.\n* Subsequent thaw_processes() will also fail to thaw the task since it is\n  marked PF_NOFREEZE.\n\nAvoid this problem by checking the task\u0027s PF_NOFREEZE status in\nfrozen_processes() before marking the task as frozen.\n\nSigned-off-by: Gautham R Shenoy \u003cego@in.ibm.com\u003e\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "ba96a0c88098697a63e80157718b7440414ed24d",
      "tree": "bdd999761eed452cc162f5b63166d1014aaf2e3e",
      "parents": [
        "33e1c288da62a6a5aa9077a6b7bfa690b1b02cf4"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Wed May 23 13:57:25 2007 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Wed May 23 20:14:11 2007 -0700"
      },
      "message": "freezer: fix vfork problem\n\nCurrently try_to_freeze_tasks() has to wait until all of the vforked processes\nexit and for this reason every user can make it fail.  To fix this problem we\ncan introduce the additional process flag PF_FREEZER_SKIP to be used by tasks\nthat do not want to be counted as freezable by the freezer and want to have\nTIF_FREEZE set nevertheless.  Then, this flag can be set by tasks using\nsys_vfork() before they call wait_for_completion(\u0026vfork) and cleared after\nthey have woken up.  After clearing it, the tasks should call try_to_freeze()\nas soon as possible.\n\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nCc: Gautham R Shenoy \u003cego@in.ibm.com\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "33e1c288da62a6a5aa9077a6b7bfa690b1b02cf4",
      "tree": "68837483316db1fa08bcb2b444cabae75d31a5b2",
      "parents": [
        "585a2858b970cb6e2e5ca4877eefd18b4dba8ed4"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Wed May 23 13:57:24 2007 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.linux-foundation.org",
        "time": "Wed May 23 20:14:10 2007 -0700"
      },
      "message": "freezer: close potential race between refrigerator and thaw_tasks\n\nIf the freezing of tasks fails and a task is preempted in refrigerator()\nbefore calling frozen_process(), then thaw_tasks() may run before this task is\nfrozen.  In that case the task will freeze and no one will thaw it.\n\nTo fix this race we can call freezing(current) in refrigerator() along with\nfrozen_process(current) under the task_lock() which also should be taken in\nthe error path of try_to_freeze_tasks() as well as in thaw_process().\nMoreover, if thaw_process() additionally clears TIF_FREEZE for tasks that are\nnot frozen, we can be sure that all tasks are thawed and there are no pending\n\"freeze\" requests after thaw_tasks() has run.\n\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nAcked-by: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: Gautham R Shenoy \u003cego@in.ibm.com\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "8a102eed9c4e1d21bad07a8fd97bd4fbf125d966",
      "tree": "9ec99f046b94971db46b08a87d7eab3e84c4acd4",
      "parents": [
        "3df494a32b936aef76d893f5065f962ebd9b9437"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Wed Dec 13 00:34:30 2006 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.osdl.org",
        "time": "Wed Dec 13 09:05:49 2006 -0800"
      },
      "message": "[PATCH] PM: Fix SMP races in the freezer\n\nCurrently, to tell a task that it should go to the refrigerator, we set the\nPF_FREEZE flag for it and send a fake signal to it.  Unfortunately there\nare two SMP-related problems with this approach.  First, a task running on\nanother CPU may be updating its flags while the freezer attempts to set\nPF_FREEZE for it and this may leave the task\u0027s flags in an inconsistent\nstate.  Second, there is a potential race between freeze_process() and\nrefrigerator() in which freeze_process() running on one CPU is reading a\ntask\u0027s PF_FREEZE flag while refrigerator() running on another CPU has just\nset PF_FROZEN for the same task and attempts to reset PF_FREEZE for it.  If\nthe refrigerator wins the race, freeze_process() will state that PF_FREEZE\nhasn\u0027t been set for the task and will set it unnecessarily, so the task\nwill go to the refrigerator once again after it\u0027s been thawed.\n\nTo solve first of these problems we need to stop using PF_FREEZE to tell\ntasks that they should go to the refrigerator.  Instead, we can introduce a\nspecial TIF_*** flag and use it for this purpose, since it is allowed to\nchange the other tasks\u0027 TIF_*** flags and there are special calls for it.\n\nTo avoid the freeze_process()-refrigerator() race we can make\nfreeze_process() to always check the task\u0027s PF_FROZEN flag after it\u0027s read\nits \"freeze\" flag.  We should also make sure that refrigerator() will\nalways reset the task\u0027s \"freeze\" flag after it\u0027s set PF_FROZEN for it.\n\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nAcked-by: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: Russell King \u003crmk@arm.linux.org.uk\u003e\nCc: David Howells \u003cdhowells@redhat.com\u003e\nCc: Andi Kleen \u003cak@muc.de\u003e\nCc: \"Luck, Tony\" \u003ctony.luck@intel.com\u003e\nCc: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nCc: Paul Mackerras \u003cpaulus@samba.org\u003e\nCc: Paul Mundt \u003clethal@linux-sh.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "5c543eff6cc658f46241f1ccb77436d65abbf445",
      "tree": "c8e097efe8b6f5731caecbb23f0c581ece15c3c0",
      "parents": [
        "cf1b939e41c28a31f2052e5c0a6619b5711ad7d0"
      ],
      "author": {
        "name": "Randy Dunlap",
        "email": "randy.dunlap@oracle.com",
        "time": "Sun Dec 10 02:18:58 2006 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.osdl.org",
        "time": "Sun Dec 10 09:55:40 2006 -0800"
      },
      "message": "[PATCH] freezer.h uses task_struct fields\n\nfreezer.h uses task_struct fields so it should include sched.h.\n\n  CC [M]  fs/jfs/jfs_txnmgr.o\nIn file included from fs/jfs/jfs_txnmgr.c:49:\ninclude/linux/freezer.h: In function \u0027frozen\u0027:\ninclude/linux/freezer.h:9: error: dereferencing pointer to incomplete type\ninclude/linux/freezer.h:9: error: \u0027PF_FROZEN\u0027 undeclared (first use in this function)\ninclude/linux/freezer.h:9: error: (Each undeclared identifier is reported only once\ninclude/linux/freezer.h:9: error: for each function it appears in.)\ninclude/linux/freezer.h: In function \u0027freezing\u0027:\ninclude/linux/freezer.h:17: error: dereferencing pointer to incomplete type\ninclude/linux/freezer.h:17: error: \u0027PF_FREEZE\u0027 undeclared (first use in this function)\ninclude/linux/freezer.h: In function \u0027freeze\u0027:\ninclude/linux/freezer.h:26: error: dereferencing pointer to incomplete type\ninclude/linux/freezer.h:26: error: \u0027PF_FREEZE\u0027 undeclared (first use in this function)\ninclude/linux/freezer.h: In function \u0027do_not_freeze\u0027:\ninclude/linux/freezer.h:34: error: dereferencing pointer to incomplete type\ninclude/linux/freezer.h:34: error: \u0027PF_FREEZE\u0027 undeclared (first use in this function)\ninclude/linux/freezer.h: In function \u0027thaw_process\u0027:\ninclude/linux/freezer.h:43: error: dereferencing pointer to incomplete type\ninclude/linux/freezer.h:43: error: \u0027PF_FROZEN\u0027 undeclared (first use in this function)\ninclude/linux/freezer.h:44: warning: implicit declaration of function \u0027wake_up_process\u0027\ninclude/linux/freezer.h: In function \u0027frozen_process\u0027:\ninclude/linux/freezer.h:55: error: dereferencing pointer to incomplete type\ninclude/linux/freezer.h:55: error: dereferencing pointer to incomplete type\ninclude/linux/freezer.h:55: error: \u0027PF_FREEZE\u0027 undeclared (first use in this function)\ninclude/linux/freezer.h:55: error: \u0027PF_FROZEN\u0027 undeclared (first use in this function)\nfs/jfs/jfs_txnmgr.c: In function \u0027freezing\u0027:\ninclude/linux/freezer.h:18: warning: control reaches end of non-void function\nmake[2]: *** [fs/jfs/jfs_txnmgr.o] Error 1\n\nSigned-off-by: Randy Dunlap \u003crandy.dunlap@oracle.com\u003e\nAcked-by: Dave Kleikamp \u003cshaggy@linux.vnet.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "a9b6f562f14dc28fb4b2415f0f275cede0abe9b5",
      "tree": "8d83009585877bf4c5f263690468d35105058822",
      "parents": [
        "a6d70980602e6f1869ebcdcbfaf55a0a5941583e"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Wed Dec 06 20:34:37 2006 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.osdl.org",
        "time": "Thu Dec 07 08:39:28 2006 -0800"
      },
      "message": "[PATCH] swsusp: Untangle thaw_processes\n\nMove the loop from thaw_processes() to a separate function and call it\nindependently for kernel threads and user space processes so that the order\nof thawing tasks is clearly visible.\n\nDrop thaw_kernel_threads() which is never used.\n\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nCc: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: Nigel Cunningham \u003cnigel@suspend2.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "ff39593ad0ff7a79a3717edac6634407aa8200c2",
      "tree": "571e02e20d5d211224567d5cc22333196cf6f563",
      "parents": [
        "14b5b7cfaa110b1d25b8f80b01a8c97cf2db30bc"
      ],
      "author": {
        "name": "Nigel Cunningham",
        "email": "ncunningham@linuxmail.org",
        "time": "Wed Dec 06 20:34:28 2006 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.osdl.org",
        "time": "Thu Dec 07 08:39:28 2006 -0800"
      },
      "message": "[PATCH] swsusp: thaw userspace and kernel space separately\n\nModify process thawing so that we can thaw kernel space without thawing\nuserspace, and thaw kernelspace first.  This will be useful in later\npatches, where I intend to get swsusp thawing kernel threads only before\nseeking to free memory.\n\nSigned-off-by: Nigel Cunningham \u003cnigel@suspend2.net\u003e\nCc: Pavel Machek \u003cpavel@ucw.cz\u003e\nCc: \"Rafael J. Wysocki\" \u003crjw@sisk.pl\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "7dfb71030f7636a0d65200158113c37764552f93",
      "tree": "276b812903d377b16d8828e888552fd256f48aab",
      "parents": [
        "8a05aac2631aa0e6494d9dc990f8c68ed8b8fde7"
      ],
      "author": {
        "name": "Nigel Cunningham",
        "email": "ncunningham@linuxmail.org",
        "time": "Wed Dec 06 20:34:23 2006 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@woody.osdl.org",
        "time": "Thu Dec 07 08:39:27 2006 -0800"
      },
      "message": "[PATCH] Add include/linux/freezer.h and move definitions from sched.h\n\nMove process freezing functions from include/linux/sched.h to freezer.h, so\nthat modifications to the freezer or the kernel configuration don\u0027t require\nrecompiling just about everything.\n\n[akpm@osdl.org: fix ueagle driver]\nSigned-off-by: Nigel Cunningham \u003cnigel@suspend2.net\u003e\nCc: \"Rafael J. Wysocki\" \u003crjw@sisk.pl\u003e\nCc: Pavel Machek \u003cpavel@ucw.cz\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    }
  ]
}