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* rt2x00: Further L2 padding fixes.Gertjan van Wingerde2009-12-21
| | | | | | | | | | | | Fix a couple of more bugs in the L2 padding code: 1. Compute the amount of L2 padding correctly (in 3 places). 2. Trim the skb correctly when the L2 padding has been applied. Also introduce a central macro the compute the L2 padding size. Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Ivo van Doorn <ivdoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* rt2x00 : trim the skb after having the l2pad removed.Alban Browaeys2009-12-21
| | | | | | | | | | | | | Otherwise we end up truncating the skb before removing the l2pad thus we might have the truncated part become garbage while getting it back in remove_l2pad. For the same issue: remove the skb_trim from the rt2800 fill_rxdone (it is done after l2pad removal in rt2x00lib_rxdone). Signed-off-by: Alban Browaeys <prahal@yahoo.com> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Ivo van Doorn <ivdoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* rt2x00 : avoid timestamp for monitor injected frame.Alban Browaeys2009-12-21
| | | | | | | | | | | Do not include timestamp for a frame that has been injected through a monitor interface. Signed-off-by: Benoit PAPILLAULT <benoit.papillault@free.fr> Signed-off-by: Alban Browaeys <prahal@yahoo.com> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Ivo van Doorn <ivdoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* rt2x00 : modify padding location.Alban Browaeys2009-12-21
| | | | | | | | | | | The padding is to be added between header and payload for the only header need padding case. Signed-off-by: Benoit PAPILLAULT <benoit.papillault@free.fr> Signed-off-by: Alban Browaeys <prahal@yahoo.com> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Ivo van Doorn <ivdoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* rt2x00 : bail out of regbusy_read if device is removed.Alban Browaeys2009-12-21
| | | | | | | | | | platform rfkill is async thus we may try to read while the device is already off. Signed-off-by: Alban Browaeys <prahal@yahoo.com> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Ivo van Doorn <ivdoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* rt73usb: add WLI-U2-H54HPKenichi HORIO2009-12-21
| | | | | | | Signed-off-by: Kenichi HORIO <moattailk1@gmail.com> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Ivo van Doorn <ivdoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* iwlwifi: remove extra error msg on sensitivity calibrationWey-Yi Guy2009-12-21
| | | | | | | | | | | | | | Do not need to log error when fail the sensitivity command, driver will send sensitivity write command to uCode after each sensitivity calibration if station is associated with AP. It is a normal case when user unload the module or shutdown the system while still associated with the AP, since uCode already on the way down, it will not reply the sensitivity write request; report error in this case will give misleading information, remove the error checking here to provide a clean shutdown if no other error detected. Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* iwlwifi: on-screen event log dumpWey-Yi Guy2009-12-21
| | | | | | | | | | | | | | | This feature enables the on-screen uCode event log dump. The original method will append the event log to syslog; with this capability, we also enable the user to write script to capture the events which provide additional flexibility to help uCode debugging Method 1) change to debugfs directory (sys/kernel/debug/phyX/iwlagn/data) 2) #cat log_event Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* iwlwifi: add continuous uCode event log capabilityWey-Yi Guy2009-12-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In order to help uCode debugging, adding the capability to provide continuous uCode event logging function. uCode events is located in round-robin event queue and filled by uCode, by enable continuous event logging, driver check the write pointer and log the newly added events in iwl_bg_ucode_trace() timer function. There is still possibility of missing events if event queue being wrapped before next event dump; but with this capability, we can have much better understanding of the uCode behavior during runtime; it can help to debug the uCode related issues. Methods to enable/disable the continuous event log: step 1: enable ucode trace timer "echo 1 > /sys/kernel/debug/ieee80211/phyX/iwlagn/debug/ucode_tracing" step 2: start ftrace sudo ./trace-cmd record -e iwlwifi_ucode:* sleep 1d step 3: stop ftrace sudo ./trace-cmd report trace.dat step 4: disable ucode trace timer "echo 0 > /sys/kernel/debug/ieee80211/phyX/iwlagn/debug/ucode_tracing" use "ucode_tracing" debugfs file to display number of event queue wrapped when driver attempt the continuous event logging. If event queue being wrapped more than once when driver has opportunity to log the event; it indicated there are events missing in the event log trace. This continuous event log function only available for 4965 and newer NICs. Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* iwlwifi: dump "Control and Status Register" when detect uCode HW/SW errorWey-Yi Guy2009-12-21
| | | | | | | | | | | When uCode HW/SW error detected, dumping important CSR (Control and Status Registers) values. Also add "csr" debugfs file to dump the current values of CSR defined in CSR table to syslog. Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* iwlwifi: log CT_CARD_DISABLED flagWey-Yi Guy2009-12-21
| | | | | | | | | | Change name from RF_CARD_DISABLED to CT_CARD_DISABLED to match the indication from uCode, also log the debug message when the condition detected in iwl_rx_card_state_notif() Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wireless: support internal statically compiled regulatory databaseJohn W. Linville2009-12-21
| | | | | | | | | | | | This patch provides infrastructure for machine translation of the regulatory rules database used by CRDA into a C data structure. It includes code for searching that database as an alternative to dynamic regulatory rules updates via CRDA. Most people should use CRDA instead of this infrastructure, but it provides a better alternative than the WIRELESS_OLD_REGULATORY infrastructure (which can now be removed). Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: remove payload alignment warningKalle Valo2009-12-21
| | | | | | | | | | | | | | | | The payload alignment warning enabled by MAC80211_DEBUG_PACKET_ALIGNMENT is difficult. To fix it, a firmware change is needed but in most cases that's very difficult. So the benefit from the warning is low and most probably it just creates more confusion for people who just enable all warnings (like it did for me). Remove the unaligned IP payload warning and the kconfig option. But leave the unaligned packet warning, it will be enabled with MAC80211_VERBOSE_DEBUG. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* rtl8180: Remove usage of deprecated 'qual'Larry Finger2009-12-21
| | | | | | | | | | | | When building rtl8180, the following warning occurs: CC [M] drivers/net/wireless/rtl818x/rtl8180_dev.o drivers/net/wireless/rtl818x/rtl8180_dev.c: In function ‘rtl8180_handle_rx’: drivers/net/wireless/rtl818x/rtl8180_dev.c:135: warning: ‘qual’ is deprecated (declared at include/net/mac80211.h:562) Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* rndis_wlan: copy module parameters for bcm4320a devices tooJussi Kivilinna2009-12-21
| | | | | | | rndis_wlan didn't copy module parameters for bcm4320a to private structure. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* rndis_wlan: move copy of module parameters to separate functionJussi Kivilinna2009-12-21
| | | | | Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: enable WMMKalle Valo2009-12-21
| | | | | | | Everything is ready now and we can enable WMM in mac80211. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: update tx_hdr when aliging skb in txKalle Valo2009-12-21
| | | | | | | | Before transmission when aligning the buffer to 4-byte bounday, tx_hdr needs to be updated. Otherwise debug logs print false data. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: implement WMMKalle Valo2009-12-21
| | | | | | | | | Now that necessary commands for WMM are implemented, implement queue handling for WMM. But WMM is not enabled yet, only one queue is used. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Reviewed-by: Janne Ylalehto <janne.ylalehto@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: implement wl1251_acx_tid_cfg()Kalle Valo2009-12-21
| | | | | | | | Needed for WMM. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Reviewed-by: Janne Ylalehto <janne.ylalehto@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: implement acx_ac_cfg to configure hardware queuesKalle Valo2009-12-21
| | | | | | | | Needed for WMM. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Reviewed-by: Janne Ylalehto <janne.ylalehto@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: use __dev_alloc_skb() on RXKalle Valo2009-12-21
| | | | | | | | | | RX is handled in a workqueue therefore allocating for GFP_ATOMIC is overkill and not required. Based on a patch for wl1271 by Luis R. Rodriguez. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: simplify ELP wakeup time calculationKalle Valo2009-12-21
| | | | | | | The wakeup time calculation was too complicated, simplify it. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: reduce ELP wakeup timeoutKalle Valo2009-12-21
| | | | | | | | The original TI driver uses 100 ms timeout ELP wakeup timeout, better to use the same. Otherwise problems with wakeup might get unnoticed. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: fix error handling in wl1251_op_config()Kalle Valo2009-12-21
| | | | | | | | Not all return values were checked and one exit from function didn't put firmware sleep after the error. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: print a debug message when tx_queue is fullKalle Valo2009-12-21
| | | | | | | This debug message was missing and caused incomplete log messages. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wl1251: add tx queue status to debugfsKalle Valo2009-12-21
| | | | | | | Sometimes when debugging the state is good info. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* ar9170: fix AC_VIDEO txop parameterChristian Lamparter2009-12-21
| | | | | | | This patch fixes a rather embarrassing typo. Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* ar9170: small misc changesChristian Lamparter2009-12-21
| | | | | | | | | | | | | | This patch aggregates a bunch of small random changes that won't fit really anywhere else properly. 1. move tid-locating macro into a separate function. 2. remove redundant NULL check. 3. add modulation mask definition Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* ar9170: remove redundant frame flagsChristian Lamparter2009-12-21
| | | | | | | | | The flags in question were once useful for debugging. Time has passed and now they do nothing more than duplicating txinfo->flags. Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* ar9170: improve network latencyChristian Lamparter2009-12-21
| | | | | | | | | AR9170 has the bad habit of choking when traffic builds up. Tests have shown that this can partially be attributed to a huge buildup of backlogged frames. Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* ar9170: remove dead definitionsChristian Lamparter2009-12-21
| | | | | | | | This patch removes dead infrastructure which was meant for an out-of-tree rate control algorithm. Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* ath9k_hw: remove unused ath9k_hw_devname() and ath9k_hw_probe()Luis R. Rodriguez2009-12-21
| | | | | Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: trace interface nameJohannes Berg2009-12-21
| | | | | | | | It's not all that useful to have the vif/sdata pointer, we'd rather refer to the interfaces by their name. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: reduce reliance on netdevJohannes Berg2009-12-21
| | | | | | | | | | | | | | | | | | | For bluetooth 3, we will most likely not have a netdev for a virtual interface (sdata), so prepare for that by reducing the reliance on having a netdev. This patch moves the name and address fields into the sdata struct and uses them from there all over. Some work is needed to keep them sync'ed, but that's not a lot of work and in slow paths anyway. In doing so, this also reduces the number of pointer dereferences in many places, because of things like sdata->dev->dev_addr becoming sdata->vif.addr. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* mac80211: make station management completely depend on vifJohannes Berg2009-12-21
| | | | | | | | | | | | | | | | | | | | | | The station management currently uses the virtual interface, but you cannot add the same station to multiple virtual interfaces if you're communicating with it in multiple ways. This restriction should be lifted so that in the future we can, for instance, support bluetooth 3 with an access point that mac80211 is already associated to. We can do that by requiring all sta_info_get users to provide the virtual interface and making the RX code aware that an address may match more than one station struct. Thanks to the previous patches this one isn't all that large and except for the RX and TX status paths changes has low complexity. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wireless: hostap, fix oops due to early probing interruptColin Ian King2009-12-21
| | | | | | | | | | | | | | | | | | | | | BugLink: https://bugs.launchpad.net/ubuntu/+bug/254837 Spurious shared interrupts or early probing interrupts can cause the hostap interrupt handler to oops before the driver has fully configured the IO base port addresses. In some cases the oops can be because the hardware shares an interrupt line, on other cases it is due to a race condition between probing for the hardware and configuring the IO base port. The latter occurs because the probing is required to determin the hardware port address which is only determined when the probe can interrupt the hardware (catch 22). This patch catches this pre-configured condition to avoid the oops. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Stefan Bader <stefan.bader@canonical.com> Acked-by: Tim Gardner <tim.gardner@canonical.com> Acked-by: Stefan Bader <stefan.bader@canonical.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
* wireless: report reasonable bitrate for MCS rates through wextJohn W. Linville2009-12-21
| | | | | | | | | | Previously, cfg80211 had reported "0" for MCS (i.e. 802.11n) bitrates through the wireless extensions interface. However, nl80211 was converting MCS rates into a reasonable bitrate number. This patch moves the nl80211 code to cfg80211 where it is now shared between both the nl80211 interface and the wireless extensions interface. Signed-off-by: John W. Linville <linville@tuxdriver.com>
* sctp: fix compile error due to sysctl mismergeLinus Torvalds2009-12-08
| | | | | | | | | | | I messed up the merge in d7fc02c7bae7b1cf69269992cf880a43a350cdaa, where the conflict in question wasn't just about CTL_UNNUMBERED being removed, but the 'strategy' field is too (sysctl handling is now done through the /proc interface, with no duplicate protocols for reading the data). Reported-by: Larry Finger <Larry.Finger@lwfinger.net> Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-2.6.33' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds2009-12-08
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-2.6.33' of git://git.kernel.dk/linux-2.6-block: (113 commits) cfq-iosched: Do not access cfqq after freeing it block: include linux/err.h to use ERR_PTR cfq-iosched: use call_rcu() instead of doing grace period stall on queue exit blkio: Allow CFQ group IO scheduling even when CFQ is a module blkio: Implement dynamic io controlling policy registration blkio: Export some symbols from blkio as its user CFQ can be a module block: Fix io_context leak after failure of clone with CLONE_IO block: Fix io_context leak after clone with CLONE_IO cfq-iosched: make nonrot check logic consistent io controller: quick fix for blk-cgroup and modular CFQ cfq-iosched: move IO controller declerations to a header file cfq-iosched: fix compile problem with !CONFIG_CGROUP blkio: Documentation blkio: Wait on sync-noidle queue even if rq_noidle = 1 blkio: Implement group_isolation tunable blkio: Determine async workload length based on total number of queues blkio: Wait for cfq queue to get backlogged if group is empty blkio: Propagate cgroup weight updation to cfq groups blkio: Drop the reference to queue once the task changes cgroup blkio: Provide some isolation between groups ...
| * cfq-iosched: Do not access cfqq after freeing itVivek Goyal2009-12-07
| | | | | | | | | | | | | | | | | | | | Fix a crash during boot reported by Jeff Moyer. Fix the issue of accessing cfqq after freeing it. Reported-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <axboe@carl.(none)>
| * block: include linux/err.h to use ERR_PTRStephen Rothwell2009-12-07
| | | | | | | | | | Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * cfq-iosched: use call_rcu() instead of doing grace period stall on queue exitJens Axboe2009-12-06
| | | | | | | | | | | | | | | | | | | | | | | | After the merge of the IO controller patches, booting on my megaraid box ran much slower. Vivek Goyal traced it down to megaraid discovery creating tons of devices, each suffering a grace period when they later kill that queue (if no device is found). So lets use call_rcu() to batch these deferred frees, instead of taking the grace period hit for each one. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * blkio: Allow CFQ group IO scheduling even when CFQ is a moduleVivek Goyal2009-12-04
| | | | | | | | | | | | | | | | o Now issues of blkio controller and CFQ in module mode should be fixed. Enable the cfq group scheduling support in module mode. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * blkio: Implement dynamic io controlling policy registrationVivek Goyal2009-12-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | o One of the goals of block IO controller is that it should be able to support mulitple io control policies, some of which be operational at higher level in storage hierarchy. o To begin with, we had one io controlling policy implemented by CFQ, and I hard coded the CFQ functions called by blkio. This created issues when CFQ is compiled as module. o This patch implements a basic dynamic io controlling policy registration functionality in blkio. This is similar to elevator functionality where ioschedulers register the functions dynamically. o Now in future, when more IO controlling policies are implemented, these can dynakically register with block IO controller. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * blkio: Export some symbols from blkio as its user CFQ can be a moduleVivek Goyal2009-12-04
| | | | | | | | | | | | | | | | | | o blkio controller is inside the kernel and cfq makes use of interfaces exported by blkio. CFQ can be a module too, hence export symbols used by CFQ. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * block: Fix io_context leak after failure of clone with CLONE_IOLouis Rilling2009-12-04
| | | | | | | | | | | | | | | | | | | | | | | | With CLONE_IO, parent's io_context->nr_tasks is incremented, but never decremented whenever copy_process() fails afterwards, which prevents exit_io_context() from calling IO schedulers exit functions. Give a task_struct to exit_io_context(), and call exit_io_context() instead of put_io_context() in copy_process() cleanup path. Signed-off-by: Louis Rilling <louis.rilling@kerlabs.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * block: Fix io_context leak after clone with CLONE_IOLouis Rilling2009-12-04
| | | | | | | | | | | | | | | | | | | | | | With CLONE_IO, copy_io() increments both ioc->refcount and ioc->nr_tasks. However exit_io_context() only decrements ioc->refcount if ioc->nr_tasks reaches 0. Always call put_io_context() in exit_io_context(). Signed-off-by: Louis Rilling <louis.rilling@kerlabs.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * cfq-iosched: make nonrot check logic consistentShaohua Li2009-12-04
| | | | | | | | | | | | | | | | | | | | | | cfq_arm_slice_timer() has logic to disable idle window for SSD device. The same thing should be done at cfq_select_queue() too, otherwise we will still see idle window. This makes the nonrot check logic consistent in cfq. Tests in a intel SSD with low_latency knob close, below patch can triple disk thoughput for muti-thread sequential read. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| * io controller: quick fix for blk-cgroup and modular CFQJens Axboe2009-12-04
| | | | | | | | | | | | It's currently not an allowed configuration, so express that in Kconfig. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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