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2007-02-11[PATCH] msdos partitions: fix logic error in AIX detectionOlaf Hering
Correct the AIX magic check to let 'echo > /dev/sdb' actually work. Signed-off-by: Olaf Hering <olh@suse.de> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] relax check for AIX in msdos partition tableOlaf Hering
The patch to identify AIX disks and ignore them has caused at least one machine to fail to find the root partition on 2.6.19. The patch is: http://lkml.org/lkml/2006/7/31/117 The problem is some disk formatters do not blow away the first 4 bytes of the disk. If the disk we are installing to used to have AIX on it, then the first 4 bytes will still have IBMA in EBCDIC. The install in question was debian etch. Im not sure what the best fix is, perhaps the AIX detection code could check more than the first 4 bytes. The whole partition info for primary partitions is in this block: dd if=/dev/sdb count=$(( 4 * 16 )) bs=1 skip=$(( 0x1be )) All other data do not matter, beside the 0x55aa marker at the end of the first block. Signed-off-by: Olaf Hering <olh@suse.de> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Get rid of "double zeroing" of allocated pagesRobert P. J. Day
Simplify the few instances where a call to "get_zeroed_page()" is closely followed by an unnecessary call to memset() to clear that page. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Cc: chas williams <chas@cmf.nrl.navy.mil> Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] IPMI: Fix some RCU problemsCorey Minyard
Fix some RCU problem pointed out by Paul McKenney of IBM. These are: The wholesale move of the command receivers list into a new list was not safe because the list will point to the new tail during a traversal, so the traversal will never end on a reader if this happens during a read. Memory barriers were needed to handle proper ordering of the setting of the IPMI interface as valid. Readers might not see proper ordering of data otherwise. In ipmi_smi_watcher_register(), the use of the _rcu suffix on the list is unnecessary. This require the list_splice_init_rcu() patch previously posted. Signed-off-by: Corey Minyard <minyard@acm.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] add an RCU version of list splicingCorey Minyard
This patch is in support of the IPMI driver. I have tested this with the IPMI driver changes coming in the next patch. Add a list_splice_init_rcu() function to splice an RCU-protected list into another list. This takes the sync function as an argument, so one would do something like: INIT_LIST_HEAD(&list); list_splice_init_rcu(&source, &dest, synchronize_rcu); The idea being to keep the RCU API proliferation down to a dull roar. [akpm@osdl.org: build fix] Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Corey Minyard <minyard@acm.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] fix sparse warnings from {asm,net}/checksum.hTilman Schmidt
Rename the variable "sum" in the __range_ok macros to avoid name collisions causing lots of "symbol shadows an earlier one" warnings by sparse. Signed-off-by: Tilman Schmidt <tilman@imap.cc> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Andi Kleen <ak@suse.de> Cc: Hirokazu Takata <takata@linux-m32r.org> Acked-by: Ian Molton <spyro@f2s.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] use cycle_t instead of u64 in struct time_interpolatorHelge Deller
The 32bit and 64bit PARISC Linux kernels suffers from the problem, that the gettimeofday() call sometimes returns non-monotonic times. The easiest way to fix this, is to drop the PARISC-specific implementation and switch over to the generic TIME_INTERPOLATION framework. But in order to make it even compile on 32bit PARISC, the patch below which touches the generic Linux code, is mandatory. More information and the full patch with the parisc-specific changes is included in this thread: http://lists.parisc-linux.org/pipermail/parisc-linux/2006-December/031003.html As far as I could see, this patch does not change anything for the existing architectures which use this framework (IA64 and SPARC64), since "cycles_t" is defined there as unsigned 64bit-integer anyway (which then makes this patch a no-change for them). Signed-off-by: Helge Deller <deller@gmx.de> Cc: <linux-arch@vger.kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] remove invalidate_inode_pages()Andrew Morton
Convert all calls to invalidate_inode_pages() into open-coded calls to invalidate_mapping_pages(). Leave the invalidate_inode_pages() wrapper in place for now, marked as deprecated. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Export invalidate_mapping_pages() to modulesAnton Altaparmakov
It makes no sense to me to export invalidate_inode_pages() and not invalidate_mapping_pages() and I actually need invalidate_mapping_pages() because of its range specification ability... akpm: also remove the export of invalidate_inode_pages() by making it an inlined wrapper. Signed-off-by: Anton Altaparmakov <aia21@cantab.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] DocBook/HTML: correction of recursive A tags in HTML outputPavel Pisa
The malformed HTML was generated after switch to XSLTPROC from SGML tools. The reference title <refentrytitle><phrase id="API-struct-x">struct x</phrase></refentrytitle> is converted into two recursive <a> tags <a href="re02.html"><span><a id="API-struct-x"></a>struct x</span></a> There is more possible solutions for this problem. One can be found at http://darkk.livejournal.com/ The proposed solution is based on suggestion provided by Jiri Kosek. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] DocBook/HTML: Generate chapter/section level TOCs for functionsPavel Pisa
Simple increase of section TOC level generation significantly enhances navigation experience through generated kernel API documentation. This change restores back state from SGML tools time. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> Acked-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, pci probingJiri Slaby
Alter the driver to use the pci probing. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, pci_probing prepareJiri Slaby
- change pci conf prototype and rename it to moxa_pci_probe - move some code to moxa_pci_probe - create moxa_pci_remove Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, remove useless variablesJiri Slaby
Remove temporary or once used variables, that can be defined locally to save some bytes. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, variables cleanupJiri Slaby
- rename moxaChannels to moxa_port - rename moxa_str to moxa_ports - move board global variables into moxa_board - move port global variables into moxa_port Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, remove moxa_pci_devinfoJiri Slaby
Nothing is used from this struct but *pdev. Remove it and store only pdev. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, use del_timer_syncJiri Slaby
Use del_timer_sync in most timer deletions, we don't want to oops in the timer function. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, macros cleanupJiri Slaby
Remove yet defined or unused macros and whitespace cleanup around the rest. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, eliminate typedefsJiri Slaby
Do not use typedefs, use directly struct <something> instead. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, use PCI_DEVICEJiri Slaby
Use PCI_DEVICE macro in pci_device_id list. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, devids cleanupJiri Slaby
Move them to pci_ids.h Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, remove unused functionsJiri Slaby
Remove ifdeffed functions and cleanup comments including too long license terms. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, remove hangup bottomhalfJiri Slaby
Call tty_hangup directly, we do not need a bottomhalf for this. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, timers cleanupJiri Slaby
Use kernel macros and functions for timer encapsulation -- do not access fileds directly. Also del_timer on inactive is legal, so that noting if it runs is senseless, delete these variables. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, do not initialize global staticJiri Slaby
Remove useless initialization of variables a) statically b) dynamically at module_init c) dynamically after kzalloc (those with '= 0/NULL') Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: moxa, remove unused allocated pageJiri Slaby
moxaXmitBuff is almost unused -- only one byte from the whole PAGE_SIZE bytes is used. Do not alloc so much space for almost anything. Also remove lock protecting this page allocation. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Add TAINT_USER and ability to set taint flags from userspaceTheodore Ts'o
Allow taint flags to be set from userspace by writing to /proc/sys/kernel/tainted, and add a new taint flag, TAINT_USER, to be used when userspace has potentially done something dangerous that might compromise the kernel. This will allow support personnel to ask further questions about what may have caused the user taint flag to have been set. For example, they might examine the logs of the realtime JVM to see if the Java program has used the really silly, stupid, dangerous, and completely-non-portable direct access to physical memory feature which MUST be implemented according to the Real-Time Specification for Java (RTSJ). Sigh. What were those silly people at Sun thinking? [akpm@osdl.org: build fix] [bunk@stusta.de: cleanup] Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, fix sparse warningJiri Slaby
Feed NULL instead of 0 where pointer is expected. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: <osv@javad.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, lock count and flagsJiri Slaby
Both open count and INITIALIZED flag should be changed under lock. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: <osv@javad.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, do not null driver_dataJiri Slaby
driver_data are initialzed to NULL from tty layer, no need to do it in the driver. In this case it cases oops, since driver_data may be NULL for a short while for another closing process. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: <osv@javad.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, upgrade to 1.9.15Jiri Slaby
- allow special rates - break when bad status Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, do not put pdevJiri Slaby
We don't call pci_dev_get, so do not call pci_dev_put in the pci release function. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, fix twice resource releasingJiri Slaby
Because brd->info is not NULLed, resources are released twice. NULL it in pci_remove function. Also take care of retval and releasing in pci_probe -- mxser_initbrd alreasy releases resource, do not do it again in fail path in probe function. Cc: Sergei Organov <osv@javad.com> Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, less loops in isrJiri Slaby
Loop only 100^2 times, not 99999^2 times in isr (at most). Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, header file cleanupJiri Slaby
- Remove no longer used macros - Move some macros from the header to the code - Remove c++ comments - Align backslashes to one column Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, alter locking in isrJiri Slaby
Avoid oopsing when stress-testing open/close -- port->tty is NULL sometimes, but is expected to be non-NULL, since dereferencing. Receive/transmit chars iff ASYNC_CLOSING is not set and ASYNC_INITIALIZED is set. Thanks Sergei for pointing this out and testing. Cc: Sergei Organov <osv@javad.com> Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Doc: isicom, remove reserved ioctl-numberJiri Slaby
Isicom driver no longer registers chardev with ioctl function. It used to use for firmware loading. Remove the reserved letter (M) from ioctl-number, so that the conflict get away. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, clean request_irq callJiri Slaby
We always set ASYNC_SHARE_IRQ, so do not test against this flag and request shared irq directly. Also remove nonsense comment. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, remove tty_wakeup bottomhalfJiri Slaby
It's safe to call tty_wakeup from irq context. Do not schedule it for later calling. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser, obsolete old, nonexperimental newJiri Slaby
Mark v 1.x as obsolete and v 2.x as non-experimental in Kconfig. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, remove unused stuffJiri Slaby
- nobody waits on close_wait - ASYNC_SPLIT_TERMIOS is not set by anybody, so do not test this flag - process session and pgrp are useless information Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] PNP: export pnp_bus_typeDavid Brownell
The PNP framework doesn't export "pnp_bus_type", which is an unfortunate exception to the policy followed by pretty much every other bus. I noticed this when I had to find a device in order to provide its platform_data. Note that per advice from Arjan, the "export" scope has been been minimized to avoid the hundred-plus bytes needed to support access from modules. In this case, the symbol is only needed by statically linked kernel code that lives outside the drivers/pnp directory. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Adam Belay <ambx1@neo.rr.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] pktcdvd: cleanupThomas Maier
- update documentation - use clear_bdi_congested/set_bdi_congested functions directly instead of old wrappers - removed DECLARE_BUF_AS_STRING macro Signed-off-by: Thomas Maier <balagi@justmail.de> Cc: Peter Osterlund <petero2@telia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Consolidate default sched_clock()Alexey Dobriyan
Use attribute(weak). Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: n_r3964, cleanupJiri Slaby
- Lindent the code - allow semicolons after macros by 'do {} while (0)' - eliminate C++ comments Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: serial167, cleanupJiri Slaby
serial167, cleanup - Lindent the code - remove 3 pointers from paranoia_check Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, remove useless spinlockJiri Slaby
gm_lock is useless, since ISA is configured at init time and there it's serialized. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Char: mxser_new, mark init functionsJiri Slaby
Mark some funcions with __init and __devinit. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] ext2: skip pages past number of blocks in ext2_find_entryEric Sandeen
This one was pointed out on the MOKB site: http://kernelfun.blogspot.com/2006/11/mokb-09-11-2006-linux-26x-ext2checkpage.html If a directory's i_size is corrupted, ext2_find_entry() will keep processing pages until the i_size is reached, even if there are no more blocks associated with the directory inode. This patch puts in some minimal sanity-checking so that we don't keep checking pages (and issuing errors) if we know there can be no more data to read, based on the block count of the directory inode. This is somewhat similar in approach to the ext3 patch I sent earlier this year. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] Relay: add CPU hotplug supportMathieu Desnoyers
Mathieu originally needed to add this for tracing Xen, but it's something that's needed for any application that can be tracing while cpus are added. unplug isn't supported by this patch. The thought was that at minumum a new buffer needs to be added when a cpu comes up, but it wasn't worth the effort to remove buffers on cpu down since they'd be freed soon anyway when the channel was closed. [zanussi@us.ibm.com: avoid lock_cpu_hotplug deadlock] Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Tom Zanussi <zanussi@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>