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* IB/mad: include GID/class when matching receivesJack Morgenstein2006-03-30
| | | | | | | | | | | | | | | Received responses are currently matched against sent requests based on TID only. According to the spec, responses should match based on the combination of TID, management class, and requester LID/GID. Without the additional qualification, an agent that is responding to two requests, both of which have the same TID, can match RMPP ACKs with the incorrect transaction. This problem can occur on the SM node when responding to SA queries. Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il> Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
* IB/mthca: Fix section mismatch problemsRoland Dreier2006-03-29
| | | | | | | | | Quite a few cleanup functions in mthca were marked as __devexit. However, they could also be called from error paths during initialization, so they cannot be marked that way. Just delete all of the incorrect annotations. Signed-off-by: Roland Dreier <rolandd@cisco.com>
* IPoIB: Fix oops with raw socketsRoland Dreier2006-03-29
| | | | | | | | | | ipoib_hard_header() needs to handle the case that daddr is NULL. This can happen when packets are injected via a raw socket, and IPoIB shouldn't oops in this case. Reported by Anton Blanchard <anton@samba.org> Signed-off-by: Roland Dreier <rolandd@cisco.com>
* IB/mthca: Fix check of size in SRQ creationJack Morgenstein2006-03-29
| | | | | | | | | | | | | | | The previous patch for Tavor broke MemFree logic. The driver should perform limit check only for Tavor. For MemFree, the check is incorrect, since ds (WQE stride) is always a power-of-2 (although the max_desc_size may not be). In Tavor, however, WQE stride and desc_size are the same, and are not necessarily power-of-2. The check was really for the WQE stride (and it Tavor, we use max_desc_size for the stride). Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
* IB/srp: Fix unmapping of fake scatterlistRoland Dreier2006-03-29
| | | | | | | | | The recently merged patch to create a fake scatterlist for non-SG SCSI commands had a bug: the driver ended up doing dma_unmap_sg() on a scatterlist scmnd->request_buffer rather than the fake scatter list it created. Fix this so that the driver unmaps the same thing it maps. Signed-off-by: Roland Dreier <rolandd@cisco.com>
* Merge git://oss.sgi.com:8090/oss/git/xfs-2.6Linus Torvalds2006-03-29
|\ | | | | | | | | | | | | | | | | | | * git://oss.sgi.com:8090/oss/git/xfs-2.6: [XFS] Cleanup in XFS after recent get_block_t interface tweaks. [XFS] Remove unused/obsoleted function: xfs_bmap_do_search_extents() [XFS] A change to inode chunk allocation to try allocating the new chunk Fixes a regression from the recent "remove ->get_blocks() support" [XFS] Fix compiler warning and small code inconsistencies in compat [XFS] We really suck at spulling. Thanks to Chris Pascoe for fixing all
| * [XFS] Cleanup in XFS after recent get_block_t interface tweaks.Nathan Scott2006-03-28
| | | | | | | | Signed-off-by: Nathan Scott <nathans@sgi.com>
| * [XFS] Remove unused/obsoleted function: xfs_bmap_do_search_extents()Mandy Kirkconnell2006-03-28
| | | | | | | | | | | | | | | | SGI-PV: 951415 SGI-Modid: xfs-linux-melb:xfs-kern:208490a Signed-off-by: Mandy Kirkconnell <alkirkco@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
| * [XFS] A change to inode chunk allocation to try allocating the new chunkGlen Overby2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | contiguous with the most recently allocated chunk. On a striped filesystem, this will fill a stripe unit with inodes before allocating new inodes in another stripe unit. SGI-PV: 951416 SGI-Modid: xfs-linux-melb:xfs-kern:208488a Signed-off-by: Glen Overby <overby@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
| * Fixes a regression from the recent "remove ->get_blocks() support"Nathan Scott2006-03-28
| | | | | | | | | | | | | | | | | | | | change. inode->i_blkbits should be used when making a get_block_t request of a filesystem instead of dio->blkbits, as that does not indicate the filesystem block size all the time (depends on request alignment - see start of __blockdev_direct_IO). Signed-off-by: Nathan Scott <nathans@sgi.com> Acked-by: Badari Pulavarty <pbadari@us.ibm.com>
| * [XFS] Fix compiler warning and small code inconsistencies in compatNathan Scott2006-03-28
| | | | | | | | | | | | | | | | | | ioctl32 land. SGI-PV: 904196 SGI-Modid: xfs-linux-melb:xfs-kern:25590a Signed-off-by: Nathan Scott <nathans@sgi.com>
| * [XFS] We really suck at spulling. Thanks to Chris Pascoe for fixing allNathan Scott2006-03-28
| | | | | | | | | | | | | | | | | | these typos. SGI-PV: 904196 SGI-Modid: xfs-linux-melb:xfs-kern:25539a Signed-off-by: Nathan Scott <nathans@sgi.com>
* | Merge branch 'for-linus' of ↵Linus Torvalds2006-03-28
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/scjody/ieee1394 * 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/scjody/ieee1394: ohci1394: cleanup the "Unexpected PCI resource length" warning. sbp2: misc debug logging cleanups sbp2: proper treatment of DID_OK ieee1394: set read permission for parameter disable_irm sbp2: check for ARM failure ohci1394: clean up asynchronous and physical request filters programming ieee1394: remove amdtp remains from ieee1394_core.h ieee1394: remove devfs support Signed-off-by: Jody McIntyre <scjody@modernduck.com> sbp2: prevent unloading of 1394 low-level driver
| * | Merge with ↵Jody McIntyre2006-03-28
| |\| | | | | | | | | | git+ssh://master.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
| * | ohci1394: cleanup the "Unexpected PCI resource length" warning.Jody McIntyre2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This warning happens in practice because the resource length reported by the chipset is too large. This is not actually a problem, so don't warn about it. If it happens to be too small, warn about that, but with a different message so people who are used to ignoring the old message don't. Signed-off-by: Jody McIntyre <scjody@modernduck.com>
| * | sbp2: misc debug logging cleanupsStefan Richter2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - move call of scsi_print_command from sbp2_send_command to the beginning of sbp2_queue_command to show also commands which are not sent - put sbp2's name into scsi_print_sense - use __FUNCTION__ in log messages - remove a few less useful log messages and comments Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
| * | sbp2: proper treatment of DID_OKStefan Richter2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | Sbp2 relied on DID_OK to be defined as 0. Always shift DID_OK into the right position anyway, and explicitly return DID_OK together with CHECK_CONDITION. Also comment on some #if 0 code. The patch does not change current behaviour. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
| * | ieee1394: set read permission for parameter disable_irmStefan Richter2006-03-28
| | | | | | | | | | | | | | | | | | | | | No need to hide it from /sys/module/ieee1394/parameters/. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
| * | sbp2: check for ARM failureStefan Richter2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Sbp2 did not check for successful registration of the lower address range when CONFIG_IEEE1394_SBP2_PHYS_DMA was set. If hpsb_register_addrspace failed, a "login timed-out" would occur which is misleading. Now sbp2 logs a sensible error message. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
| * | ohci1394: clean up asynchronous and physical request filters programmingStefan Richter2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Various cleanups of how ohci1394 programs AsynchronousRequestFilter, PhysicalRequestFilter, and physUpperBoundOffset. In particular, do not rewrite registers within the bus reset interrupt handler if bus resets do not affect the registers in the first place. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
| * | ieee1394: remove amdtp remains from ieee1394_core.hStefan Richter2006-03-28
| | | | | | | | | | | | | | | | | | | | | since amdtp driver was deleted Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
| * | ieee1394: remove devfs supportStefan Richter2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Devfs has been disabled in the last kernel releases, so let's remove it from ieee1394core, raw1394, video1394, dv1394. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Cc: Dan Dennedy <dan@dennedy.org> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
| * | Signed-off-by: Jody McIntyre <scjody@modernduck.com>Jody McIntyre2006-03-28
| | |
| * | sbp2: prevent unloading of 1394 low-level driverStefan Richter2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a new SBP-2 unit is added, sbp2 now takes a reference on the 1394 low-level driver (ohci1394 or pcilynx). This prevents the 1394 host driver module from being unloaded, e.g. by an administrative routine cleanup of unused kernel modules or when another 1394 driver which depends on ohci1394 is unloaded. The reference is dropped when the SBP-2 unit was disconnected, when sbp2 is unloaded or detached from the unit, or when addition of the SBP-2 unit failed. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
* | | [PATCH] send_sigqueue: simplify and fix the raceOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | send_sigqueue() checks PF_EXITING, then locks p->sighand->siglock. This is unsafe: 'p' can exit in between and set ->sighand = NULL. The race is theoretical, the window is tiny and irqs are disabled by the caller, so I don't think we need the fix for -stable tree. Convert send_sigqueue() to use lock_task_sighand() helper. Also, delete 'p->flags & PF_EXITING' re-check, it is unneeded and the comment is wrong. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] do_notify_parent_cldstop: remove 'to_self' paramOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The previous patch has changed callsites of do_notify_parent_cldstop() so that to_self == (->ptrace & PT_PTRACED) always (as it should be). We can remove this parameter now. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] finish_stop: don't check stop_count < 0Oleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove an obscure 'stop_count < 0' check in finish_stop(). The previous patch made this case impossible. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] simplify do_signal_stop()Oleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | do_signal_stop() considers 'thread_group_empty()' as a special case. This was needed to avoid taking tasklist_lock. Since this lock is unneeded any longer, we can remove this special case and simplify the code even more. Also, before this patch, finish_stop() was called with stop_count == -1 for 'thread_group_empty()' case. This is not strictly wrong, but confusing and unneeded. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] cleanup __exit_signal->cleanup_sighand pathOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move 'tsk->sighand = NULL' from cleanup_sighand() to __exit_signal(). This makes the exit path more understandable and allows us to do cleanup_sighand() outside of ->siglock protected section. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] make fork() atomic wrt pgrp/session signalsOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Eric W. Biederman wrote: > > Ok. SUSV3/Posix is clear, fork is atomic with respect > to signals. Either a signal comes before or after a > fork but not during. (See the rationale section). > http://www.opengroup.org/onlinepubs/000095399/functions/fork.html > > The tasklist_lock does not stop forks from adding to a process > group. The forks stall while the tasklist_lock is held, but a fork > that began before we grabbed the tasklist_lock simply completes > afterwards, and the child does not receive the signal. This also means that SIGSTOP or sig_kernel_coredump() signal can't be delivered to pgrp/session reliably. With this patch copy_process() returns -ERESTARTNOINTR when it detects a pending signal, fork() will be restarted transparently after handling the signals. This patch also deletes now unneeded "group_stop_count > 0" check, copy_process() can no longer succeed while group stop in progress. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-By: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] pids: kill PIDTYPE_TGIDOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch kills PIDTYPE_TGID pid_type thus saving one hash table in kernel/pid.c and speeding up subthreads create/destroy a bit. It is also a preparation for the further tref/pids rework. This patch adds 'struct list_head thread_group' to 'struct task_struct' instead. We don't detach group leader from PIDTYPE_PID namespace until another thread inherits it's ->pid == ->tgid, so we are safe wrt premature free_pidmap(->tgid) call. Currently there are no users of find_task_by_pid_type(PIDTYPE_TGID). Should the need arise, we can use find_task_by_pid()->group_leader. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-By: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] do_sigaction: don't take tasklist_lockOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | do_sigaction() does not need tasklist_lock anymore, we can simplify the code. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] do_group_exit: don't take tasklist_lockOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | do_group_exit() takes tasklist_lock for zap_other_threads(), this is unneeded now. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] do_signal_stop: don't take tasklist_lockOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | do_signal_stop() does not need tasklist_lock anymore. So it does not need to do misc re-checks, and we can simplify the code. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] relax sig_needs_tasklist()Oleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | handle_stop_signal() does not need tasklist_lock for SIG_KERNEL_STOP_MASK signals anymore. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] sys_times: don't take tasklist_lockOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | sys_times: don't take tasklist_lock Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] do __unhash_process() under ->siglockOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch moves __unhash_process() call from realease_task() to __exit_signal(), so __detach_pid() is called with ->siglock held. This means we don't need tasklist_lock to iterate over thread group anymore: copy_process() was already changed to do attach_pid() under ->siglock. Eric's "pidhash-kill-switch_exec_pids.patch" from -mm changed de_thread() so it doesn't touch PIDTYPE_TGID. NOTE: de_thread() still needs some attention. It still changes task->pid lockless. Taking ->sighand.siglock here allows to do more tasklist_lock removals. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] revert "Optimize sys_times for a single thread process"Oleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch reverts 'CONFIG_SMP && thread_group_empty()' optimization in sys_times(). The reason is that the next patch breaks memory ordering which is needed for that optimization. tasklist_lock in sys_times() will be eliminated completely by further patch. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] move __exit_signal() to kernel/exit.cOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | __exit_signal() is private to release_task() now. I think it is better to make it static in kernel/exit.c and export flush_sigqueue() instead - this function is much more simple and straightforward. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] rename __exit_sighand to cleanup_sighandOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cosmetic, rename __exit_sighand to cleanup_sighand and move it close to copy_sighand(). This matches copy_signal/cleanup_signal naming, and I think it is easier to follow. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] cleanup __exit_signal()Oleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch factors out duplicated code under 'if' branches. Also, BUG_ON() conversions and whitespace cleanups. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] copy_process: cleanup bad_fork_cleanup_signalOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | __exit_signal() does important cleanups atomically under ->siglock. It is also called from copy_process's error path. This is not good, for example we can't move __unhash_process() under ->siglock for that reason. We should not mix these 2 paths, just look at ugly 'if (p->sighand)' under 'bad_fork_cleanup_sighand:' label. For copy_process() case it is sufficient to just backout copy_signal(), nothing more. Again, nobody can see this task yet. For CLONE_THREAD case we just decrement signal->count, otherwise nobody can see this ->signal and we can free it lockless. This patch assumes it is safe to do exit_thread_group_keys() without tasklist_lock. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] copy_process: cleanup bad_fork_cleanup_sighandOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The only caller of exit_sighand(tsk) is copy_process's error path. We can call __exit_sighand() directly and kill exit_sighand(). This 'tsk' was not yet registered in pid_hash[] or init_task.tasks, it has no external references, nobody can see it, and IF (clone_flags & CLONE_SIGHAND) At least 'current' has a reference to ->sighand, this means atomic_dec_and_test(sighand->count) can't be true. ELSE Nobody can see this ->sighand, this means we can free it without any locking. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] introduce sig_needs_tasklist() helperOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | In my opinion this patch cleans up the code. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] introduce lock_task_sighand() helperOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add lock_task_sighand() helper and converts group_send_sig_info() to use it. Hopefully we will have more users soon. This patch also removes '!sighand->count' and '!p->usage' checks, I think they both are bogus, racy and unneeded (but probably it makes sense to restore them as BUG_ON()s). ->sighand is cleared and it's ->count is decremented in release_task() with sighand->siglock held, so it is a bug to have '!p->usage || !->count' after we already locked and verified it is the same. On the other hand, an already dead task without ->sighand can have a non-zero ->usage due to ptrace, for example. If we read the stale value of ->sighand we must see the change after spin_lock(), because that change was done while holding that same old ->sighand.siglock. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] convert sighand_cache to use SLAB_DESTROY_BY_RCUOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch borrows a clever Hugh's 'struct anon_vma' trick. Without tasklist_lock held we can't trust task->sighand until we locked it and re-checked that it is still the same. But this means we don't need to defer 'kmem_cache_free(sighand)'. We can return the memory to slab immediately, all we need is to be sure that sighand->siglock can't dissapear inside rcu protected section. To do so we need to initialize ->siglock inside ctor function, SLAB_DESTROY_BY_RCU does the rest. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] release_task: replace open-coded ptrace_unlink()Oleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | Use ptrace_unlink() instead of open-coding. No changes in kernel/exit.o Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] wait_for_helper: trivial style cleanupOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | Use NULL instead of (... *)0 Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] reparent_thread: use remove_parent/add_parentOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use remove_parent/add_parent instead of open coding. No changes in kernel/exit.o Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | | [PATCH] pidhash: don't use zero pidsOleg Nesterov2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | daemonize() calls set_special_pids(1,1), while init and kernel threads spawned from init/main.c:init() run with 0,0 special pids. This patch changes INIT_SIGNALS() so that that they run with ->pgrp == ->session == 1 also. This patch relies on fact that swapper's pid == 1. Now we have no hashed zero pids in pid_hash[]. User-space visibible change is that now /sbin/init runs with (1,1) special pids and becomes a session leader. Quoting Eric W. Biederman: > > daemonize consuming pids (1,1) then consumes pgrp 1. So that when > /sbin/init calls setsid() it thinks /sbin/init is a process group > leader and setsid() fails. So /sbin/init wants pgrp 1 session 1 > but doesn't get it. I am pretty certain daemonize did not exist so > /sbin/init got pgrp 1 session 1 in 2.4. > > That is the bug that is being fixed. > > This patch takes things one step farther and essentially calls > setsid() for pid == 1 before init is execed. That is new behavior > but it cleans up the kernel as we now do not need to support the > case of a process without a process group or a session. > > The only process that could have possibly cared was /sbin/init > and it already calls setsid() because it doesn't want that. > > If this was going to break anything noticeable the change in behavior > from 2.4 to 2.6 would have already done that. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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