Revision 73863ab028579ed98c4f1f36d016536b1b415344 authored by Anton Vorontsov on 31 May 2012, 23:26:23 UTC, committed by Linus Torvalds on 01 June 2012, 00:49:29 UTC
Current CPU hotplug code has some task->mm handling issues: 1. Working with task->mm w/o getting mm or grabing the task lock is dangerous as ->mm might disappear (exit_mm() assigns NULL under task_lock(), so tasklist lock is not enough). We can't use get_task_mm()/mmput() pair as mmput() might sleep, so we must take the task lock while handle its mm. 2. Checking for process->mm is not enough because process' main thread may exit or detach its mm via use_mm(), but other threads may still have a valid mm. To fix this we would need to use find_lock_task_mm(), which would walk up all threads and returns an appropriate task (with task lock held). clear_tasks_mm_cpumask() has all the issues fixed, so let's use it. Suggested-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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File | Mode | Size |
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Kconfig | -rw-r--r-- | 7.6 KB |
Makefile | -rw-r--r-- | 1.3 KB |
aes_ccm.c | -rw-r--r-- | 3.4 KB |
aes_ccm.h | -rw-r--r-- | 784 bytes |
aes_cmac.c | -rw-r--r-- | 2.6 KB |
aes_cmac.h | -rw-r--r-- | 574 bytes |
agg-rx.c | -rw-r--r-- | 11.1 KB |
agg-tx.c | -rw-r--r-- | 27.0 KB |
cfg.c | -rw-r--r-- | 76.8 KB |
cfg.h | -rw-r--r-- | 155 bytes |
chan.c | -rw-r--r-- | 2.9 KB |
debugfs.c | -rw-r--r-- | 11.2 KB |
debugfs.h | -rw-r--r-- | 373 bytes |
debugfs_key.c | -rw-r--r-- | 8.9 KB |
debugfs_key.h | -rw-r--r-- | 1.1 KB |
debugfs_netdev.c | -rw-r--r-- | 18.9 KB |
debugfs_netdev.h | -rw-r--r-- | 706 bytes |
debugfs_sta.c | -rw-r--r-- | 11.7 KB |
debugfs_sta.h | -rw-r--r-- | 427 bytes |
driver-ops.h | -rw-r--r-- | 20.4 KB |
driver-trace.c | -rw-r--r-- | 230 bytes |
driver-trace.h | -rw-r--r-- | 31.4 KB |
event.c | -rw-r--r-- | 913 bytes |
ht.c | -rw-r--r-- | 12.0 KB |
ibss.c | -rw-r--r-- | 33.0 KB |
ieee80211_i.h | -rw-r--r-- | 45.4 KB |
iface.c | -rw-r--r-- | 40.1 KB |
key.c | -rw-r--r-- | 18.0 KB |
key.h | -rw-r--r-- | 3.9 KB |
led.c | -rw-r--r-- | 7.9 KB |
led.h | -rw-r--r-- | 2.1 KB |
main.c | -rw-r--r-- | 29.7 KB |
mesh.c | -rw-r--r-- | 22.5 KB |
mesh.h | -rw-r--r-- | 12.9 KB |
mesh_hwmp.c | -rw-r--r-- | 32.5 KB |
mesh_pathtbl.c | -rw-r--r-- | 29.2 KB |
mesh_plink.c | -rw-r--r-- | 25.4 KB |
mesh_sync.c | -rw-r--r-- | 9.2 KB |
michael.c | -rw-r--r-- | 2.2 KB |
michael.h | -rw-r--r-- | 573 bytes |
mlme.c | -rw-r--r-- | 98.3 KB |
offchannel.c | -rw-r--r-- | 8.0 KB |
pm.c | -rw-r--r-- | 3.5 KB |
rate.c | -rw-r--r-- | 13.0 KB |
rate.h | -rw-r--r-- | 4.2 KB |
rc80211_minstrel.c | -rw-r--r-- | 15.8 KB |
rc80211_minstrel.h | -rw-r--r-- | 2.3 KB |
rc80211_minstrel_debugfs.c | -rw-r--r-- | 4.7 KB |
rc80211_minstrel_ht.c | -rw-r--r-- | 22.9 KB |
rc80211_minstrel_ht.h | -rw-r--r-- | 2.9 KB |
rc80211_minstrel_ht_debugfs.c | -rw-r--r-- | 3.3 KB |
rc80211_pid.h | -rw-r--r-- | 7.7 KB |
rc80211_pid_algo.c | -rw-r--r-- | 14.6 KB |
rc80211_pid_debugfs.c | -rw-r--r-- | 5.9 KB |
rx.c | -rw-r--r-- | 85.8 KB |
scan.c | -rw-r--r-- | 26.3 KB |
spectmgmt.c | -rw-r--r-- | 2.8 KB |
sta_info.c | -rw-r--r-- | 36.3 KB |
sta_info.h | -rw-r--r-- | 18.3 KB |
status.c | -rw-r--r-- | 19.8 KB |
tkip.c | -rw-r--r-- | 11.8 KB |
tkip.h | -rw-r--r-- | 917 bytes |
tx.c | -rw-r--r-- | 75.7 KB |
util.c | -rw-r--r-- | 44.8 KB |
wep.c | -rw-r--r-- | 9.5 KB |
wep.h | -rw-r--r-- | 1.1 KB |
wme.c | -rw-r--r-- | 4.4 KB |
wme.h | -rw-r--r-- | 742 bytes |
work.c | -rw-r--r-- | 8.3 KB |
wpa.c | -rw-r--r-- | 17.0 KB |
wpa.h | -rw-r--r-- | 1.1 KB |
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