1. 13 Jul, 2007 5 commits
    • Dan Williams's avatar
      raid5: refactor handle_stripe5 and handle_stripe6 (v3) · a4456856
      Dan Williams authored
      handle_stripe5 and handle_stripe6 have very deep logic paths handling the
      various states of a stripe_head.  By introducing the 'stripe_head_state'
      and 'r6_state' objects, large portions of the logic can be moved to
      sub-routines.
      
      'struct stripe_head_state' consumes all of the automatic variables that previously
      stood alone in handle_stripe5,6.  'struct r6_state' contains the handle_stripe6
      specific variables like p_failed and q_failed.
      
      One of the nice side effects of the 'stripe_head_state' change is that it
      allows for further reductions in code duplication between raid5 and raid6.
      The following new routines are shared between raid5 and raid6:
      
      	handle_completed_write_requests
      	handle_requests_to_failed_array
      	handle_stripe_expansion
      
      Changes:
      * v2: fixed 'conf->raid_disk-1' for the raid6 'handle_stripe_expansion' path
      * v3: removed the unused 'dirty' field from struct stripe_head_state
      * v3: coalesced open coded bi_end_io routines into return_io()
      Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
      Acked-By: default avatarNeilBrown <neilb@suse.de>
      a4456856
    • Dan Williams's avatar
      async_tx: add the async_tx api · 9bc89cd8
      Dan Williams authored
      The async_tx api provides methods for describing a chain of asynchronous
      bulk memory transfers/transforms with support for inter-transactional
      dependencies.  It is implemented as a dmaengine client that smooths over
      the details of different hardware offload engine implementations.  Code
      that is written to the api can optimize for asynchronous operation and the
      api will fit the chain of operations to the available offload resources. 
       
      	I imagine that any piece of ADMA hardware would register with the
      	'async_*' subsystem, and a call to async_X would be routed as
      	appropriate, or be run in-line. - Neil Brown
      
      async_tx exploits the capabilities of struct dma_async_tx_descriptor to
      provide an api of the following general format:
      
      struct dma_async_tx_descriptor *
      async_<operation>(..., struct dma_async_tx_descriptor *depend_tx,
      			dma_async_tx_callback cb_fn, void *cb_param)
      {
      	struct dma_chan *chan = async_tx_find_channel(depend_tx, <operation>);
      	struct dma_device *device = chan ? chan->device : NULL;
      	int int_en = cb_fn ? 1 : 0;
      	struct dma_async_tx_descriptor *tx = device ?
      		device->device_prep_dma_<operation>(chan, len, int_en) : NULL;
      
      	if (tx) { /* run <operation> asynchronously */
      		...
      		tx->tx_set_dest(addr, tx, index);
      		...
      		tx->tx_set_src(addr, tx, index);
      		...
      		async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
      	} else { /* run <operation> synchronously */
      		...
      		<operation>
      		...
      		async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param);
      	}
      
      	return tx;
      }
      
      async_tx_find_channel() returns a capable channel from its pool.  The
      channel pool is organized as a per-cpu array of channel pointers.  The
      async_tx_rebalance() routine is tasked with managing these arrays.  In the
      uniprocessor case async_tx_rebalance() tries to spread responsibility
      evenly over channels of similar capabilities.  For example if there are two
      copy+xor channels, one will handle copy operations and the other will
      handle xor.  In the SMP case async_tx_rebalance() attempts to spread the
      operations evenly over the cpus, e.g. cpu0 gets copy channel0 and xor
      channel0 while cpu1 gets copy channel 1 and xor channel 1.  When a
      dependency is specified async_tx_find_channel defaults to keeping the
      operation on the same channel.  A xor->copy->xor chain will stay on one
      channel if it supports both operation types, otherwise the transaction will
      transition between a copy and a xor resource.
      
      Currently the raid5 implementation in the MD raid456 driver has been
      converted to the async_tx api.  A driver for the offload engines on the
      Intel Xscale series of I/O processors, iop-adma, is provided in a later
      commit.  With the iop-adma driver and async_tx, raid456 is able to offload
      copy, xor, and xor-zero-sum operations to hardware engines.
       
      On iop342 tiobench showed higher throughput for sequential writes (20 - 30%
      improvement) and sequential reads to a degraded array (40 - 55%
      improvement).  For the other cases performance was roughly equal, +/- a few
      percentage points.  On a x86-smp platform the performance of the async_tx
      implementation (in synchronous mode) was also +/- a few percentage points
      of the original implementation.  According to 'top' on iop342 CPU
      utilization drops from ~50% to ~15% during a 'resync' while the speed
      according to /proc/mdstat doubles from ~25 MB/s to ~50 MB/s.
       
      The tiobench command line used for testing was: tiobench --size 2048
      --block 4096 --block 131072 --dir /mnt/raid --numruns 5
      * iop342 had 1GB of memory available
      
      Details:
      * if CONFIG_DMA_ENGINE=n the asynchronous path is compiled away by making
        async_tx_find_channel a static inline routine that always returns NULL
      * when a callback is specified for a given transaction an interrupt will
        fire at operation completion time and the callback will occur in a
        tasklet.  if the the channel does not support interrupts then a live
        polling wait will be performed
      * the api is written as a dmaengine client that requests all available
        channels
      * In support of dependencies the api implicitly schedules channel-switch
        interrupts.  The interrupt triggers the cleanup tasklet which causes
        pending operations to be scheduled on the next channel
      * Xor engines treat an xor destination address differently than a software
        xor routine.  To the software routine the destination address is an implied
        source, whereas engines treat it as a write-only destination.  This patch
        modifies the xor_blocks routine to take a an explicit destination address
        to mirror the hardware.
      
      Changelog:
      * fixed a leftover debug print
      * don't allow callbacks in async_interrupt_cond
      * fixed xor_block changes
      * fixed usage of ASYNC_TX_XOR_DROP_DEST
      * drop dma mapping methods, suggested by Chris Leech
      * printk warning fixups from Andrew Morton
      * don't use inline in C files, Adrian Bunk
      * select the API when MD is enabled
      * BUG_ON xor source counts <= 1
      * implicitly handle hardware concerns like channel switching and
        interrupts, Neil Brown
      * remove the per operation type list, and distribute operation capabilities
        evenly amongst the available channels
      * simplify async_tx_find_channel to optimize the fast path
      * introduce the channel_table_initialized flag to prevent early calls to
        the api
      * reorganize the code to mimic crypto
      * include mm.h as not all archs include it in dma-mapping.h
      * make the Kconfig options non-user visible, Adrian Bunk
      * move async_tx under crypto since it is meant as 'core' functionality, and
        the two may share algorithms in the future
      * move large inline functions into c files
      * checkpatch.pl fixes
      * gpl v2 only correction
      
      Cc: Herbert Xu <herbert@gondor.apana.org.au>
      Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
      Acked-By: default avatarNeilBrown <neilb@suse.de>
      9bc89cd8
    • Dan Williams's avatar
      xor: make 'xor_blocks' a library routine for use with async_tx · 685784aa
      Dan Williams authored
      The async_tx api tries to use a dma engine for an operation, but will fall
      back to an optimized software routine otherwise.  Xor support is
      implemented using the raid5 xor routines.  For organizational purposes this
      routine is moved to a common area.
      
      The following fixes are also made:
      * rename xor_block => xor_blocks, suggested by Adrian Bunk
      * ensure that xor.o initializes before md.o in the built-in case
      * checkpatch.pl fixes
      * mark calibrate_xor_blocks __init, Adrian Bunk
      
      Cc: Adrian Bunk <bunk@stusta.de>
      Cc: NeilBrown <neilb@suse.de>
      Cc: Herbert Xu <herbert@gondor.apana.org.au>
      Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
      685784aa
    • Dan Williams's avatar
      dmaengine: make clients responsible for managing channels · d379b01e
      Dan Williams authored
      The current implementation assumes that a channel will only be used by one
      client at a time.  In order to enable channel sharing the dmaengine core is
      changed to a model where clients subscribe to channel-available-events.
      Instead of tracking how many channels a client wants and how many it has
      received the core just broadcasts the available channels and lets the
      clients optionally take a reference.  The core learns about the clients'
      needs at dma_event_callback time.
      
      In support of multiple operation types, clients can specify a capability
      mask to only be notified of channels that satisfy a certain set of
      capabilities.
      
      Changelog:
      * removed DMA_TX_ARRAY_INIT, no longer needed
      * dma_client_chan_free -> dma_chan_release: switch to global reference
        counting only at device unregistration time, before it was also happening
        at client unregistration time
      * clients now return dma_state_client to dmaengine (ack, dup, nak)
      * checkpatch.pl fixes
      * fixup merge with git-ioat
      
      Cc: Chris Leech <christopher.leech@intel.com>
      Signed-off-by: default avatarShannon Nelson <shannon.nelson@intel.com>
      Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      d379b01e
    • Dan Williams's avatar
      dmaengine: refactor dmaengine around dma_async_tx_descriptor · 7405f74b
      Dan Williams authored
      The current dmaengine interface defines mutliple routines per operation,
      i.e. dma_async_memcpy_buf_to_buf, dma_async_memcpy_buf_to_page etc.  Adding
      more operation types (xor, crc, etc) to this model would result in an
      unmanageable number of method permutations.
      
      	Are we really going to add a set of hooks for each DMA engine
      	whizbang feature?
      		- Jeff Garzik
      
      The descriptor creation process is refactored using the new common
      dma_async_tx_descriptor structure.  Instead of per driver
      do_<operation>_<dest>_to_<src> methods, drivers integrate
      dma_async_tx_descriptor into their private software descriptor and then
      define a 'prep' routine per operation.  The prep routine allocates a
      descriptor and ensures that the tx_set_src, tx_set_dest, tx_submit routines
      are valid.  Descriptor creation and submission becomes:
      
      struct dma_device *dev;
      struct dma_chan *chan;
      struct dma_async_tx_descriptor *tx;
      
      tx = dev->device_prep_dma_<operation>(chan, len, int_flag)
      tx->tx_set_src(dma_addr_t, tx, index /* for multi-source ops */)
      tx->tx_set_dest(dma_addr_t, tx, index)
      tx->tx_submit(tx)
      
      In addition to the refactoring, dma_async_tx_descriptor also lays the
      groundwork for definining cross-channel-operation dependencies, and a
      callback facility for asynchronous notification of operation completion.
      
      Changelog:
      * drop dma mapping methods, suggested by Chris Leech
      * fix ioat_dma_dependency_added, also caught by Andrew Morton
      * fix dma_sync_wait, change from Andrew Morton
      * uninline large functions, change from Andrew Morton
      * add tx->callback = NULL to dmaengine calls to interoperate with async_tx
        calls
      * hookup ioat_tx_submit
      * convert channel capabilities to a 'cpumask_t like' bitmap
      * removed DMA_TX_ARRAY_INIT, no longer needed
      * checkpatch.pl fixes
      * make set_src, set_dest, and tx_submit descriptor specific methods
      * fixup git-ioat merge
      * move group_list and phys to dma_async_tx_descriptor
      
      Cc: Jeff Garzik <jeff@garzik.org>
      Cc: Chris Leech <christopher.leech@intel.com>
      Signed-off-by: default avatarShannon Nelson <shannon.nelson@intel.com>
      Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      7405f74b
  2. 11 Jul, 2007 8 commits
  3. 08 Jul, 2007 6 commits
  4. 07 Jul, 2007 4 commits
    • Adrian Bunk's avatar
      DLM must depend on SYSFS · 95511ad4
      Adrian Bunk authored
      The dependency of DLM on SYSFS got lost in
      commit 6ed7257b resulting in the
      following compile error with CONFIG_DLM=y, CONFIG_SYSFS=n:
      
      <--  snip  -->
      
      ...
        LD      .tmp_vmlinux1
      fs/built-in.o: In function `dlm_lockspace_init':
      /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/fs/dlm/lockspace.c:231: undefined reference to `kernel_subsys'
      fs/built-in.o: In function `configfs_init':
      /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/fs/configfs/mount.c:143: undefined reference to `kernel_subsys'
      make[1]: *** [.tmp_vmlinux1] Error 1
      
      <--  snip  -->
      Signed-off-by: default avatarAdrian Bunk <bunk@stusta.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      95511ad4
    • Dave Jones's avatar
      Clean up E7520/7320/7525 quirk printk. · 38377be8
      Dave Jones authored
      The printk level in this printk is bogus, as the previous printk
      didn't have a terminating \n resulting in ..
      
      Intel E7520/7320/7525 detected.<6>Disabling irq balancing and affinity
      
      It also never printed a \n at all in the case where we didn't do
      the quirk.
      
      Change it to only make noise if it actually does something useful.
      Signed-off-by: default avatarDave Jones <davej@redhat.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      38377be8
    • Adrian Bunk's avatar
      include/linux/kallsyms.h must #include <linux/errno.h> · 40e48eed
      Adrian Bunk authored
      This patch fixes the following 2.6.22 regression with CONFIG_KALLSYMS=n:
      
      <--  snip  -->
      
      ...
        CC      arch/m32r/kernel/traps.o
      In file included from /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/arch/m32r/kernel/traps.c:14:
      /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/include/linux/kallsyms.h: In function 'lookup_symbol_name':
      /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/include/linux/kallsyms.h:66: error: 'ERANGE' undeclared (first use in this function)
      /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/include/linux/kallsyms.h:66: error: (Each undeclared identifier is reported only once
      /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/include/linux/kallsyms.h:66: error: for each function it appears in.)
      /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/include/linux/kallsyms.h: In function 'lookup_symbol_attrs':
      /home/bunk/linux/kernel-2.6/linux-2.6.22-rc6-mm1/include/linux/kallsyms.h:71: error: 'ERANGE' undeclared (first use in this function)
      make[2]: *** [arch/m32r/kernel/traps.o] Error 1
      
      <--  snip  -->
      Signed-off-by: default avatarAdrian Bunk <bunk@stusta.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      40e48eed
    • David Woodhouse's avatar
      Fix use-after-free oops in Bluetooth HID. · 1c39858b
      David Woodhouse authored
      When cleaning up HIDP sessions, we currently close the ACL connection
      before deregistering the input device. Closing the ACL connection
      schedules a workqueue to remove the associated objects from sysfs, but
      the input device still refers to them -- and if the workqueue happens to
      run before the input device removal, the kernel will oops when trying to
      look up PHYSDEVPATH for the removed input device.
      
      Fix this by deregistering the input device before closing the
      connections.
      Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
      Acked-by: default avatarMarcel Holtmann <marcel@holtmann.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1c39858b
  5. 06 Jul, 2007 17 commits
    • Christoph Lameter's avatar
      slub: remove useless EXPORT_SYMBOL · d23cf676
      Christoph Lameter authored
      kmem_cache_open is static. EXPORT_SYMBOL was leftover from some earlier
      time period where kmem_cache_open was usable outside of slub.
      
      (Fixes powerpc build error)
      Signed-off-by: default avatarChrsitoph Lameter <clameter@sgi.com>
      Cc: Johannes Berg <johannes@sipsolutions.net>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d23cf676
    • maximilian attems's avatar
      MAINTAINERS new kernel janitors ml · c3000e03
      maximilian attems authored
      davem kindly moved the list from osdl to vger.
      Signed-of-by: default avatarmaximilian attems <max@stro.at>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Cc: Randy Dunlap <randy.dunlap@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c3000e03
    • Andres Salomon's avatar
      GEODE: reboot fixup for geode machines with CS5536 boards · 95069f89
      Andres Salomon authored
      Writing to MSR 0x51400017 forces a hard reset on CS5536-based machines,
      this has the reboot fixup do just that if such a board is detected.
      Acked-by: default avatarJordan Crouse <jordan.crouse@amd.com>
      Signed-off-by: default avatarAndres Salomon <dilinger@debian.org>
      Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
      Cc: Andi Kleen <ak@suse.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      95069f89
    • Linus Torvalds's avatar
      Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 · 1feb17e2
      Linus Torvalds authored
      * 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6:
        [NETPOLL]: Fixups for 'fix soft lockup when removing module'
        [NET]: net/core/netevent.c should #include <net/netevent.h>
        [NETFILTER]: nf_conntrack_h323: add checking of out-of-range on choices' index values
        [NET] skbuff: remove export of static symbol
        SCTP: Add scope_id validation for link-local binds
        SCTP: Check to make sure file is valid before setting timeout
        SCTP: Fix thinko in sctp_copy_laddrs()
      1feb17e2
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus · dadde13a
      Linus Torvalds authored
      * 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
        [MIPS] Fix scheduling latency issue on 24K, 34K and 74K cores
        [MIPS] Add macros to encode processor revisions.
        [MIPS] RM7000: Enable ICACHE_REFILLS_WORKAROUND_WAR.
        [MIPS] SMTC: Fix cut'n'paste bug in Kconfig.debug
        [MIPS] Change libgcc-style functions from lib-y to obj-y
        [MIPS] Fix timer/performance interrupt detection
        [MIPS] AP/SP: Avoid triggering the 34K E125 performance issue
        [MIPS] 64-bit TO_PHYS_MASK macro for RM9000 processors
      dadde13a
    • Peter Zijlstra's avatar
      mm: fixup /proc/vmstat output · 23c1fb52
      Peter Zijlstra authored
      Line up the vmstat_text with zone_stat_item
      
      enum zone_stat_item {
      	/* First 128 byte cacheline (assuming 64 bit words) */
      	NR_FREE_PAGES,
      	NR_INACTIVE,
      	NR_ACTIVE,
      
      We current have nr_active and nr_inactive reversed.
      
      [ "OK with patch, though using initializers canbe handy to prevent such
         things in future:
      
      	static const char * const vmstat_text[] = {
      		[NR_FREE_PAGES] = "nr_free_pages",
      		..."
      							 - Alexey ]
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Acked-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      23c1fb52
    • Yoann Padioleau's avatar
      potential compiler error, irqfunc caller sites update · 0da2f0f1
      Yoann Padioleau authored
      In 7d12e780 David Howells performed
      this evolution:
       "IRQ: Maintain regs pointer globally rather than passing to IRQ handlers"
      
      He correctly updated many of the function definitions that were using this
      extra regs pointer parameter but forgot to update some caller sites of
      those functions.  The reason the modifications was not properly done on all
      drivers is that some drivers were rarely compiled because they are for
      AMIGA, or that some code sites were inside #ifdefs where the option is not
      set or inside #if 0.
      
      Here is the semantic patch that found the occurences
      and fixed the problem.
      
      @ rule1 @
      identifier fn;
      identifier irq, dev_id;
      typedef irqreturn_t;
      @@
      
      static irqreturn_t fn(int irq, void *dev_id)
      {
         ...
      }
      
      @@
      identifier rule1.fn;
      expression E1, E2, E3;
      @@
      
       fn(E1, E2
      -   ,E3
         )
      Signed-off-by: default avatarYoann Padioleau <padator@wanadoo.fr>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Jeff Garzik <jeff@garzik.org>
      Cc: Greg KH <greg@kroah.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0da2f0f1
    • Vivek Goyal's avatar
      i386: es7000 build breakage fix · 071922c0
      Vivek Goyal authored
      o Commit 1833d6bc broke the build if
        compiled with CONFIG_ES7000=y and CONFIG_X86_GENERICARCH=n
      
      arch/i386/kernel/built-in.o(.init.text+0x4fa9): In function `acpi_parse_madt':
      : undefined reference to `acpi_madt_oem_check'
      arch/i386/kernel/built-in.o(.init.text+0x7406): In function `smp_read_mpc':
      : undefined reference to `mps_oem_check'
      arch/i386/kernel/built-in.o(.init.text+0x8990): In function
      `connect_bsp_APIC':
      : undefined reference to `enable_apic_mode'
      make: *** [.tmp_vmlinux1] Error 1
      
      o Fix the build issue. Provided the definitions of missing functions.
      
      o Don't have ES7000 machine. Only compile tested.
      
      Cc: Len Brown <lenb@kernel.org>
      Cc: Natalie Protasevich <protasnb@gmail.com>
      Cc: Roland Dreier <rolandd@cisco.com>
      Cc: Andi Kleen <ak@suse.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      071922c0
    • Bjorn Helgaas's avatar
      PNP SMCf010 quirk: work around Toshiba Portege 4000 ACPI issues · 41a53114
      Bjorn Helgaas authored
      When we enable the SMCf010 IR device, the Toshiba Portege 4000 BIOS claims
      the device is working, but it really isn't configured correctly.  The BIOS
      *will* configure it, but only if we call _SRS after (1) reversing the order
      of the SIR and FIR I/O port regions and (2) changing the IRQ from
      active-high to active-low.
      
      This patch addresses the 2.6.22 regression:
          "no irda0 interface (2.6.21 was OK), smsc does not find chip"
      
      I tested this on a Portege 4000.  The smsc-ircc2 driver correctly detects
      the device, and "irattach irda0 -s && irdadump" shows transmitted and
      received packets.
      Signed-off-by: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
      Cc: Andrey Borzenkov <arvidjaar@mail.ru>
      Cc: Samuel Ortiz <samuel@sortiz.org>
      Cc: "Linus Walleij (LD/EAB)" <linus.walleij@ericsson.com>
      Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
      Cc: Adam Belay <ambx1@neo.rr.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      41a53114
    • Alexander Graf's avatar
      fix logic error in ipc compat semctl() · d57d9731
      Alexander Graf authored
      When calling a semctl(IPC_STAT) without IPC_64 the check if the memory is
      unevaluated.  This patch fixes this.
      Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d57d9731
    • David Woodhouse's avatar
      x86_64: fix headers_install · 0db19c41
      David Woodhouse authored
      A bug in headers_install for ARCH=x86_64 yields an asm/ directory full of
      files all of which are using the same #ifdef guard, "__ASM_STUB_" with no
      postfix.  So the second and later asm files #included in the same C file
      (often through standard headers like ioctl.h) yields no symbols.
      
      Strangeness with the Ubuntu 'tell me if I support something that's not
      explcitly mentioned in POSIX, and I'll strip it out' shell, I believe.
      
      We don't need the 'export' but we do need a semicolon at the end of the
      FNAME line:
      Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
      Signed-off-by: default avatarRob Landley <rob@landley.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0db19c41
    • Loic Prylli's avatar
      MTRR: Fix race causing set_mtrr to go into infinite loop · d25c1ba2
      Loic Prylli authored
      Processors synchronization in set_mtrr requires the .gate field to be set
      after .count field is properly initialized.  Without an explicit barrier,
      the compiler was reordering those memory stores.  That was sometimes
      causing a processor (in ipi_handler) to see the .gate change and decrement
      .count before the latter is set by set_mtrr() (which then hangs in a
      infinite loop with irqs disabled).
      Signed-off-by: default avatarLoic Prylli <loic@myri.com>
      Cc: Andi Kleen <ak@suse.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d25c1ba2
    • Jason Wessel's avatar
      i386: fix regression, endless loop in ptrace singlestep over an int80 · 1e2e99f0
      Jason Wessel authored
      The commit 635cf99a introduced a
      regression.  Executing a ptrace single step after certain int80
      accesses will infinitely loop and never advance the PC.
      
      The TIF_SINGLESTEP check should be done on the return from the syscall
      and not before it.
      
      I loops on each single step on the pop right after the int80 which writes out
      to the console.  At that point you can issue as many single steps as you want
      and it will not advance any further.
      
      The test case is below:
      
      /* Test whether singlestep through an int80 syscall works.
       */
      #define _GNU_SOURCE
      #include <stdio.h>
      #include <unistd.h>
      #include <fcntl.h>
      #include <sys/ptrace.h>
      #include <sys/wait.h>
      #include <sys/mman.h>
      #include <asm/user.h>
      #include <string.h>
      
      static int child, status;
      static struct user_regs_struct regs;
      
      static void do_child()
      {
      	char str[80] = "child: int80 test\n";
      
      	ptrace(PTRACE_TRACEME, 0, 0, 0);
      	kill(getpid(), SIGUSR1);
      	write(fileno(stdout),str,strlen(str));
      	asm ("int $0x80" : : "a" (20)); /* getpid */
      }
      
      static void do_parent()
      {
      	unsigned long eip, expected = 0;
      again:
      	waitpid(child, &status, 0);
      	if (WIFEXITED(status) || WIFSIGNALED(status))
      		return;
      
      	if (WIFSTOPPED(status)) {
      		ptrace(PTRACE_GETREGS, child, 0, &regs);
      		eip = regs.eip;
      		if (expected)
      			fprintf(stderr, "child stop @ %08lx, expected %08lx %s\n",
      					eip, expected,
      					eip == expected ? "" : " <== ERROR");
      
      		if (*(unsigned short *)eip == 0x80cd) {
      			fprintf(stderr, "int 0x80 at %08x\n", (unsigned int)eip);
      			expected = eip + 2;
      		} else
      			expected = 0;
      
      		ptrace(PTRACE_SINGLESTEP, child, NULL, NULL);
      	}
      	goto again;
      }
      
      int main(int argc, char * const argv[])
      {
      	child = fork();
      	if (child)
      		do_parent();
      	else
      		do_child();
      	return 0;
      }
      Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
      Cc: Jeremy Fitzhardinge <jeremy@goop.org>
      Cc: <stable@kernel.org>
      Cc: Chuck Ebbert <76306.1226@compuserve.com>
      Acked-by: default avatarAndi Kleen <ak@suse.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1e2e99f0
    • Michael Ellerman's avatar
      Fix elf_core_dump() when writing arch specific notes (spu coredumps) · ef7320ed
      Michael Ellerman authored
      elf_core_dump() supports dumping arch specific ELF notes, via the #define
      ELF_CORE_WRITE_EXTRA_NOTES.  Currently the only user of this is the powerpc
      spu coredump code.
      
      There is a bug in the handling of foffset WRT the arch notes, which causes
      us to erroneously increment foffset by the size of the arch notes, leaving
      a block of zeroes in the file, and causing all subsequent data in the file
      to be at <supposed position> + <arch note size>.  eg:
      
        LOAD  0x050000 0x00100000 0x00000000 0x20000 0x20000 R E 0x10000
      
      Tells us we should have a chunk of data at 0x50000.  The truth is the data
      is at 0x90dbc = 0x50000 + 0x40dbc (the size of the arch notes).
      
      This bug prevents gdb from reading the core file correctly.
      
      The simplest fix is to simply remember the size of the arch notes, and add
      it to foffset after we've written the arch notes.  The only drawback is
      that if the arch code doesn't write as many bytes as it said it would, we
      end up with a broken core dump again.  For now I think that's a reasonable
      requirement.
      
      Tested on a Cell blade, gdb no longer complains about the core file being
      bogus.
      
      While I'm here I should point out that the spu coredump code does not work
      if we're dumping to a pipe - we'll have to wait for 23 to fix that.
      Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
      Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Acked-by: default avatarPaul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ef7320ed
    • Ralf Baechle's avatar
      [MIPS] Fix scheduling latency issue on 24K, 34K and 74K cores · 4b3e975e
      Ralf Baechle authored
      The idle loop goes to sleep using the WAIT instruction if !need_resched().
      This has is suffering from from a race condition that if if just after
      need_resched has returned 0 an interrupt might set TIF_NEED_RESCHED but
      we've just completed the test so go to sleep anyway.  This would be
      trivial to fix by just disabling interrupts during that sequence as in:
      
              local_irq_disable();
              if (!need_resched())
                      __asm__("wait");
              local_irq_enable();
      
      but the processor architecture leaves it undefined if a processor calling
      WAIT with interrupts disabled will ever restart its pipeline and indeed
      some processors have made use of the freedom provided by the architecture
      definition.  This has been resolved and the Config7.WII bit indicates that
      the use of WAIT is safe on 24K, 24KE and 34K cores.  It also is safe on
      74K starting revision 2.1.0 so enable the use of WAIT with interrupts
      disabled for 74K based on a c0_prid of at least that.
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      4b3e975e
    • Ralf Baechle's avatar
      [MIPS] Add macros to encode processor revisions. · fde97822
      Ralf Baechle authored
      Older processors used to encode processor version and revision in two
      4-bit bitfields, the 4K seems to simply count up and even newer MTI cores
      have switched to use the 8-bits as 3:3:2 bitfield with the last field as
      the patch number.
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      fde97822
    • Ralf Baechle's avatar
      [MIPS] RM7000: Enable ICACHE_REFILLS_WORKAROUND_WAR. · 075c733e
      Ralf Baechle authored
      The RM7000 processors and the E9000 cores have a bug (though PMC-Sierra
      opposes it being called that) where invalid instructions in the same
      I-cache line worth of instructions being fetched may case spurious
      exceptions.
      
      The workaround for this was only enabled for E9000 cores; enable it also
      for all RM7000-based platforms.
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      075c733e