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path: root/drivers/s390/scsi/zfcp_qdio.c
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2009-09-05[SCSI] zfcp: optimize zfcp_qdio_accountHeiko Carstens
Remove expensive ktime_get()/ktime_us_delta() functions from the hot path and use get_clock_monotonic() instead. This elimates seven function calls and avoids a lot of unnecessary calculations. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-05[SCSI] zfcp: introduce _setup, _destroy for qdio and FCSwen Schillig
Extract independent data structures and introduce common _setup and _destroy routines for QDIO and Fibre Channel related data structures Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-05[SCSI] zfcp: Update dbf callsSwen Schillig
Change the dbf data and functions to use the zfcp_dbf prefix throughout the code. Also change the calls to dbf to use zfcp_dbf instead of zfcp_adapter. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-05[SCSI] zfcp: Move qdio related data out of zfcp_adapterSwen Schillig
The zfcp_adapter structure was growing over time to a size of almost one memory page. To reduce the size of the data structure and to seperate different layers, put all qdio related data in the new zfcp_qdio data structure. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-05[SCSI] zfcp: Separate qdio attributes from zfcp_fsf_reqSwen Schillig
Split all qdio related attributes out of zfcp_fsf_req and put it in new structure. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-05[SCSI] zfcp: fix layering oddities between zfcp_fsf and zfcp_qdioSwen Schillig
There is no need for the QDIO layer to have knowledge or do things wich are done better by the FSF layer and vice versa. Straighten a few things to improve vividness. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-03-12[SCSI] zfcp: Remove PCI flagChristof Schmitt
The usage of the PCI flag to trigger interrupts is optional. Even without setting the flag, qdio still receives interrupts to continue working on the queue. Remove the PCI flag from zfcp, it is not necessary. Acked-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-03-12[SCSI] zfcp: replace current ERP logging with a more convenient versionSwen Schillig
The current number based id ERP logging is replaced by a string based tag version. The benefit is an easier location of the code in question and the removal of the lengthy array referencing the individual messages. The string (7 bytes) based version does not use more space since those bytes were "used" anyway due to the alignment of the structure. The encoding of the 7 byte string is as follows [0-1] = filename [2-5] = task/function [6] = section Due to the character of this string (fixed length) a string termination is not required here. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-03-12[SCSI] zfcp: add measurement data for average qdio queue utilisationMartin Peschke
Provide measurement data for the utilisation of the QDIO outbound queue. The additional value allows to calculate an average queue utilisation by looking at the deltas per time unit. Needed for capacity planning. It is up to user space to handle wrap-arounds of the 64 bit value. The new counter neatly complements the existing counter for queue full conditions. That is why, both statistics counter have been integrated. Signed-off-by: Martin Peschke <mpeschke@linux.vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-12-29[SCSI] zfcp: Remove busid macroChristof Schmitt
With the change to the dev_ message macros, the macro to get the busid is only used in a few places. Remove it and directly get the dev_name from the device. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-12-25[S390] convert zfcp printks to pr_xxx macros.Christof Schmitt
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-10-17blktrace: pass zfcp driver dataStefan Raspl
This patch writes the channel and fabric latencies in nanoseconds per request via blktrace for later analysis. The utilization of the inbound and outbound adapter queue is also reported. Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-10-03[SCSI] zfcp: Simplify zfcp data structuresChristof Schmitt
Reduce the size of zfcp data structures by removing unused and redundant members. scsi_lun is only the mangled version of the fcp_lun. So, remove the redundant field and use the fcp_lun instead. Since the queue lock and the pci_batch indicator are only used in the request queue, move them from the common queue struct to the adapter struct. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-10-03[SCSI] zfcp: remove unused references, declarations and flagsSwen Schillig
- Remove unused references and declarations, including one instance of the FC ls_adisc struct that has been defined twice. - Also remove the flags COMMON_OPENING, COMMON_CLOSING, ADAPTER_REGISTERED and XPORT_OK that are only set and cleared, but not checked anywhere. - Remove the zfcp specific atomic_test_mask makro. Simply use atomic_read directly instead. - Remove the zfcp internal sg helper functions and switch the places where it is still used to call sg_virt directly. - With the update of the QDIO code, the QDIO data structures no longer use the volatile type qualifier. Now we can also remove the volatile qualifiers from the zfcp code. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-10-03[SCSI] zfcp: Update message with input from reviewChristof Schmitt
Update the kernel messages in zfcp with input from the message review and remove some messages that have been identified as redundant. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-10-03[SCSI] zfcp: add queue_full sysfs attributeStefan Raspl
Adds a new sysfs attribute queue_full for adapters that records the number of incidents where a requests could not be submitted due to insufficient free space on the request queue. Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-08-29[SCSI] zfcp: Fix request queue lockingChristof Schmitt
The request queue lock can be acquired from softirq context when the SCSI midlayer issues commands. Disable softirqs for this lock when commands are issued from zfcp. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Martin Petermann <martin@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-07-17[S390] qdio: new qdio driver.Jan Glauber
List of major changes: - split qdio driver into several files - seperation of thin interrupt code - improved handling for multiple thin interrupt devices - inbound and outbound processing now always runs in tasklet context - significant less tasklet schedules per interrupt needed - merged qebsm with non-qebsm handling - cleanup qdio interface and added kerneldoc - coding style Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Utz Bacher <utz.bacher@de.ibm.com> Reviewed-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-07-12[SCSI] zfcp: zfcp_fsf cleanup.Swen Schillig
Code cleanup for the zfcp_fsf.c file. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-07-12[SCSI] zfcp: Small QDIO cleanupsChristof Schmitt
QBUFF_PER_PAGE is only used inside the qdio module, so move it to zfcp_qdio.c zfcp_qdio_zero_sbals is now only used in the qdio module, so make it static. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-07-12[SCSI] zfcp: Cleanup qdio codeSwen Schillig
Cleanup the interface code from zfcp to qdio. Also move code that belongs to the qdio interface from the erp to the qdio file. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-06-05[SCSI] zfcp: Add information about interrupt to trace.Martin Peschke
Store the index of the buffer in the inbound queue used to report request completion in trace record for request coompletion. This piece of information allows to better compare qdio and zfcp traces. Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-06-05[SCSI] zfcp: Rename sbal_curr to sbal_last.Martin Peschke
sbal_last is more appropriate, because it matches sbal_first. Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-06-05[SCSI] zfcp: Rename sbal_last.Martin Peschke
sbal_last is confusing, as it is not the last one actually used, but just a limit. sbal_limit is a better name. Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-04-18[SCSI] zfcp: fix 31 bit compile warningsMartin Peschke
drivers/s390/scsi/zfcp_aux.c: In function ‘zfcp_fsf_incoming_els_rscn’: drivers/s390/scsi/zfcp_aux.c:1379: warning: cast from pointer to integer of different size drivers/s390/scsi/zfcp_aux.c: In function ‘zfcp_fsf_incoming_els_plogi’: drivers/s390/scsi/zfcp_aux.c:1432: warning: cast from pointer to integer of different size drivers/s390/scsi/zfcp_aux.c: In function ‘zfcp_fsf_incoming_els_logo’: drivers/s390/scsi/zfcp_aux.c:1457: warning: cast from pointer to integer of different size .. Just passing pointers rids us of these warnings and improves readability. Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-04-07[SCSI] zfcp: Remove obsolete erp_dbf traceMartin Peschke
This patch removes the now obsolete erp_dbf trace. Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-04-07[SCSI] zfcp: Trace all triggers of error recovery activityMartin Peschke
This patch allows any recovery event to be traced back to an exact cause, e.g. a particular request identified by an id (address). Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-01-26[S390] drivers/s390/: Spelling fixesJoe Perches
Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-10-16zfcp: sg chaining supportFUJITA Tomonori
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-12[SCSI] zfcp: whitespace cleanupSwen Schillig
Cleanup the whitepace from the entire zfcp driver to prevent to have those changes in future feature or function patches. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-08-15[SCSI] zfcp: fix the data buffer accessor patchHeiko Carstens
Fix the data buffer accessor patch. For request without a data buffer nothing was written into a SBALE. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-07-31[SCSI] zfcp: convert to use the data buffer accessorsFUJITA Tomonori
- remove the unnecessary map_single path. - convert to use the new accessors for the sg lists and the parameters. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-07-18[SCSI] zfcp: code cleanupSwen Schillig
improve code for buffer enqueue. easy readability and maintainability. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-05-09Fix occurrences of "the the "Michael Opdenacker
Signed-off-by: Michael Opdenacker <michael@free-electrons.com> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2007-05-08[SCSI] zfcp: rework request ID management.Heiko Carstens
Simplify request ID management and make sure that frequently used functions are inlined. Also fix a memory leak in zfcp_adapter_enqueue() which only gets hit in error handling. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-05-08[SCSI] zfcp: Stop system after memory corruptionChristof Schmitt
For each request that is sent to the FCP adapter, zfcp allocates memory. Status information and data that is being read from the device is written to this memory by the hardware. After that, the hardware signals this via the response queue and zfcp continues processing. Now, if zfcp detects that there is a signal for an incoming response from the hardware, but there is no outstanding request for that request id, then some memory that can be in use anywhere in the system has just been overwritten. This should never happen, but if it does, stop the system with a panic. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-02-05[S390] Avoid excessive inlining.Heiko Carstens
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2006-08-06[SCSI] zfcp: improve management of request IDsVolker Sameske
Improve request handling. Use hash table to manage request IDs. Signed-off-by: Volker Sameske <sameske@de.ibm.com> Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-03[PATCH] zfcp: fix incorrect usage of fsf_req_list_lockHeiko Carstens
================================= [ INFO: inconsistent lock state ] --------------------------------- inconsistent {in-hardirq-W} -> {hardirq-on-W} usage. swapper/0 [HC0[0]:SC1[1]:HE1:SE0] takes: (&adapter->fsf_req_list_lock){++..}, at: [<0000000000274486>] zfcp_qdio_reqid_check+0x46/0x178 {in-hardirq-W} state was registered at: [<000000000005fb0c>] __lock_acquire+0xad8/0xed0 [<00000000000604ae>] lock_acquire+0x9a/0xc8 [<000000000035a326>] _spin_lock+0x4e/0x68 [<0000000000274486>] zfcp_qdio_reqid_check+0x46/0x178 [<000000000027469e>] zfcp_qdio_response_handler+0xe6/0x430 [<0000000000219dd4>] tiqdio_thinint_handler+0xd20/0x213c [<000000000020229a>] do_adapter_IO+0xb2/0xc0 [<0000000000206f32>] do_IRQ+0x136/0x16c [<0000000000020462>] io_no_vtime+0x16/0x1c [<0000000000019432>] cpu_idle+0x222/0x250 irq event stamp: 129220 hardirqs last enabled at (129220): [<00000000000411e6>] tasklet_hi_action+0x5a/0x19c hardirqs last disabled at (129219): [<00000000000411c0>] tasklet_hi_action+0x34/0x19c softirqs last enabled at (129212): [<0000000000040b62>] __do_softirq+0x13a/0x180 softirqs last disabled at (129217): [<000000000001fd58>] do_softirq+0xec/0xf0 other info that might help us debug this: no locks held by swapper/0. stack backtrace: 00000000012bb670 0000000000000002 0000000000000000 00000000012bb780 00000000012bb6e8 0000000000399122 0000000000399122 0000000000016b0a 0000000000000000 0000000000000000 0000000000000000 00000000004660e8 0000000000000000 000000000000000d 00000000012bb6e0 00000000012bb758 0000000000368b90 0000000000016b0a 00000000012bb6e0 00000000012bb730 Call Trace: ([<0000000000016a26>] show_trace+0x76/0xdc) [<0000000000016b2c>] show_stack+0xa0/0xd0 [<0000000000016b8a>] dump_stack+0x2e/0x3c [<000000000005e3da>] print_usage_bug+0x27e/0x290 [<000000000005ea9c>] mark_lock+0x6b0/0x6c0 [<000000000005f33e>] __lock_acquire+0x30a/0xed0 [<00000000000604ae>] lock_acquire+0x9a/0xc8 [<000000000035a326>] _spin_lock+0x4e/0x68 [<0000000000274486>] zfcp_qdio_reqid_check+0x46/0x178 [<000000000027469e>] zfcp_qdio_response_handler+0xe6/0x430 [<0000000000217bd2>] tiqdio_tl+0xd02/0x2120 [<000000000004123a>] tasklet_hi_action+0xae/0x19c [<0000000000040ae4>] __do_softirq+0xbc/0x180 [<000000000001fd58>] do_softirq+0xec/0xf0 [<0000000000040c38>] irq_exit+0x90/0xa8 [<0000000000206f40>] do_IRQ+0x144/0x16c [<0000000000020462>] io_no_vtime+0x16/0x1c [<0000000000019432>] cpu_idle+0x222/0x250 ([<0000000000019416>] cpu_idle+0x206/0x250) [<000000000001405a>] rest_init+0x5a/0x68 [<0000000000536998>] start_kernel+0x39c/0x3dc [<0000000000013046>] _stext+0x46/0x1000 Fix incorrect usage of fsf_req_list_lock. It's used in tasklet context (irqs on) as well as in irq context. Therefore use the spin_lock_irqsave variant to avoid deadlocks. Acked-by: Andreas Herrmann <aherrman@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-05-28[SCSI] zfcp: (cleanup) removed superfluous macros, struct members, typedefsAndreas Herrmann
Removed some macros, struct members and typedefs which were unused or not necessary. Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-05-28[SCSI] zfcp: (cleanup) shortened copyright and author informationAndreas Herrmann
Copyright update, shortened file headers, shortened author information. Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-02-01[PATCH] s390: Remove CVS generated informationHeiko Carstens
- Remove all CVS generated information like e.g. revision IDs from drivers/s390 and include/asm-s390 (none present in arch/s390). - Add newline at end of arch/s390/lib/Makefile to avoid diff message. Acked-by: Andreas Herrmann <aherrman@de.ibm.com> Acked-by: Frank Pavlic <pavlic@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-19[SCSI] zfcp: enhancement of zfcp debug featuresMaxim Shchetynin
Debug features (DBFs) els_dbf, cmd_dbf and abt_dbf were removed and san_dbf, hba_dbf and scsi_dbf were introduced. The erp_dbf did not change. The new traces improve debugging of problems with zfcp, scsi-stack, multipath and hardware in the SAN. san_dbf traces things like ELS and CT commands, hba_dbf saves HBA specific information of requests, and scsi_dbf saves FCP and SCSI specific information of requests. Common to all new DBFs is that they provide a so called structured view. This significantly improves readability of the traces. Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-13[SCSI] zfcp: fix bug during adapter shutdownAndreas Herrmann
Fixes a race between zfcp_fsf_req_dismiss_all and zfcp_qdio_reqid_check. During adapter shutdown it occurred that a request was cleaned up twice. First during its normal completion. Second when dismiss_all was called. The fix is to serialize access to fsf request list between zfcp_fsf_req_dismiss_all and zfcp_qdio_reqid_check and delete a fsf request from the list if its completion is triggered. (Additionally a rwlock was replaced by a spinlock and fsf_req_cleanup was eliminated.) Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-11[SCSI] zfcp: remove flags_dump featureAndreas Herrmann
Removes the rarely used "flags_dump" mechanism of zfcp. Equivalent debug information will be provided with a reworking of zfcp's s390dbf-facilities which is in preparation. Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-04-16Linux-2.6.12-rc2Linus Torvalds
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!