Commit Graph

86333 Commits

Author SHA1 Message Date
Roland McGrath 6d00815323 [SPARC64]: exec PT_DTRACE
The PT_DTRACE flag is meaningless and obsolete.
Don't touch it.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-23 22:50:16 -07:00
Robert P. J. Day 1f17131bb4 [SPARC64]: Use shorter list_splice_init() for brevity.
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-23 22:48:29 -07:00
David S. Miller 64658743fd [SPARC64]: Remove most limitations to kernel image size.
Currently kernel images are limited to 8MB in size, and this causes
problems especially when enabling features that take up a lot of
kernel image space such as lockdep.

The code now will align the kernel image size up to 4MB and map that
many locked TLB entries.  So, the only practical limitation is the
number of available locked TLB entries which is 16 on Cheetah and 64
on pre-Cheetah sparc64 cpus.  Niagara cpus don't actually have hw
locked TLB entry support.  Rather, the hypervisor transparently
provides support for "locked" TLB entries since it runs with physical
addressing and does the initial TLB miss processing.

Fully utilizing this change requires some help from SILO, a patch for
which will be submitted to the maintainer.  Essentially, SILO will
only currently map up to 8MB for the kernel image and that needs to be
increased.

Note that neither this patch nor the SILO bits will help with network
booting.  The openfirmware code will only map up to a certain amount
of kernel image during a network boot and there isn't much we can to
about that other than to implemented a layered network booting
facility.  Solaris has this, and calls it "wanboot" and we may
implement something similar at some point.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-21 17:01:38 -07:00
David S. Miller 4cfea5a7df [SPARC64]: Fix atomic backoff limit.
4096 will not fit into the immediate field of a compare instruction,
in fact it will end up being -4096 causing the check to fail every
time and thus disabling backoff.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-19 01:04:48 -07:00
David S. Miller f0e98c387e [SPARC]: Fix link errors with gcc-4.3
Reported by Adrian Bunk.

Just like in changeset a3f9985843
("[SPARC64]: Move kernel unaligned trap handlers into assembler
file.") we have to move the assembler bits into a seperate
asm file because as far as the compiler is concerned
these inline bits we're doing in unaligned.c are unreachable.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-03 15:01:05 -08:00
Harvey Harrison 9a4a668240 sparc64: replace remaining __FUNCTION__ occurances
__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-03 11:42:17 -08:00
Harvey Harrison 74074dec4f sparc: replace remaining __FUNCTION__ occurances
__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-03 11:41:51 -08:00
David S. Miller 7729d74ed5 [SPARC]: Add reboot_command[] extern decl to asm/system.h
Kill off some sparse warnings.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-28 21:53:20 -08:00
David S. Miller c8edc89d24 [SPARC]: Mark linux_sparc_{fpu,chips} static.
Caught by sparse.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-28 21:46:59 -08:00
David S. Miller be71716e46 [SPARC64]: Adjust kernel PC validation test in fault handler.
Because of the new futex validation init handler, we have
to accept faults in init section text as well as the normal
kernel text.

Thanks to Tom Callaway for the bug report.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-28 20:38:15 -08:00
David S. Miller 622eaec613 [SPARC64]: Loosen checks in exception table handling.
Some parts of the kernel now do things like do *_user() accesses while
set_fs(KERNEL_DS) that fault on purpose.

See, for example, the code added by changeset
a0c1e9073e ("futex: runtime enable pi
and robust functionality").

That trips up the ASI sanity checking we make in do_kernel_fault().

Just remove it for now.  Maybe we can add it back later with an added
conditional which looks at the current get_fs() value.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-26 17:30:02 -08:00
Sam Ravnborg 896aef430e [SPARC64]: Fix section mismatch from kernel_map_range
Fix following warnings:
WARNING: vmlinux.o(.text+0x4f980): Section mismatch in reference from the function kernel_map_range() to the function .init.text:__alloc_bootmem()
WARNING: vmlinux.o(.text+0x4f9cc): Section mismatch in reference from the function kernel_map_range() to the function .init.text:__alloc_bootmem()

alloc_bootmem() is only used during early init and for any subsequent
call to kernel_map_range() the program logic avoid the call.
So annotate kernel_map_range() with __ref to tell modpost to
ignore the reference to a __init function.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-24 19:49:52 -08:00
Sam Ravnborg 7769bd1c65 [SPARC64]: Fix section mismatchs from dr_cpu_data
Fix following warnings:
WARNING: vmlinux.o(.text+0x4b258): Section mismatch in reference from the function dr_cpu_data() to the function .devinit.text:mdesc_fill_in_cpu_data()
WARNING: vmlinux.o(.text+0x4b290): Section mismatch in reference from the function dr_cpu_data() to the function .cpuinit.text:cpu_up()

mdesc_fill_in_cpu_data() is only used during early init and for
cpu hotplug so the __cpuinit annotation is the correct choice.
We have the call chain:
dr_cpu_data() => dr_cpu_configure() => mdesc_fill_in_cpu_data()

dr_cpu_data() is used only during early init and for cpu
hotplug. So annotating them all __cpuinit solves the
section mismatch and should be correct.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-24 19:47:51 -08:00
David S. Miller b80a71860d [SPARC]: Fix build in arch/sparc/kernel/led.c
CC [M]  arch/sparc/kernel/led.o
arch/sparc/kernel/led.c: In function 'led_blink':
arch/sparc/kernel/led.c:35: error: invalid use of undefined type 'struct
timer_list'
arch/sparc/kernel/led.c:35: error: 'jiffies' undeclared (first use in
this function)
arch/sparc/kernel/led.c:35: error: (Each undeclared identifier is
reported only once
arch/sparc/kernel/led.c:35: error: for each function it appears in.)
arch/sparc/kernel/led.c:36: error: 'avenrun' undeclared (first use in
this function)
arch/sparc/kernel/led.c:36: error: 'FSHIFT' undeclared (first use in
this function)
arch/sparc/kernel/led.c:36: error: 'HZ' undeclared (first use in this
function)
arch/sparc/kernel/led.c:37: error: invalid use of undefined type 'struct
timer_list'
arch/sparc/kernel/led.c:39: error: invalid use of undefined type 'struct
timer_list'
arch/sparc/kernel/led.c:40: error: invalid use of undefined type 'struct
timer_list'
arch/sparc/kernel/led.c:42: error: implicit declaration of function
'add_timer'
arch/sparc/kernel/led.c: In function 'led_write_proc':
arch/sparc/kernel/led.c:70: error: implicit declaration of function
'copy_from_user'
arch/sparc/kernel/led.c:84: error: implicit declaration of function
'del_timer_sync'
arch/sparc/kernel/led.c: In function 'led_init':
arch/sparc/kernel/led.c:109: error: implicit declaration of function
'init_timer'
arch/sparc/kernel/led.c:110: error: invalid use of undefined type
'struct timer_list'
make[1]: *** [arch/sparc/kernel/led.o] Error 1

Based upon original patch by Robert Reif.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-24 18:45:09 -08:00
Linus Torvalds bfa274e243 Linux 2.6.25-rc3 2008-02-24 13:25:54 -08:00
Gaston, Jason D d28dc71121 i2c-i801: Add support for the ICH10
Add the Intel ICH10 SMBus Controller DeviceID's and updates
Tolapai support.

Signed-off-by: Jason Gaston <jason.d.gaston@intel.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-02-24 20:03:42 +01:00
David Brownell 263867631e i2c: Make i2c_register_board_info() a NOP when CONFIG_I2C_BOARDINFO=n
Don't require platform code to be #ifdeffed according to whether
I2C is enabled or not ... if it's not enabled, let GCC compile out
all I2C device declarations.  (Issue noted on an NSLU2 build that
didn't configure I2C.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-02-24 20:03:42 +01:00
Christian Krafft 104cb574fe i2c-pca-isa: Add access check to legacy ioports
When probing i2c-pca-isa writes to legacy ioports, which crashes the kernel
if there is no device at that port.
This patch adds a check_legacy_ioport call, so probe fails gracefully
and thus prevents the oops.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-02-24 20:03:42 +01:00
Manuel Lauss 9e39ffeff6 Alchemy: compile fix
Commit 8b798c4d16 broke
alchemy build, fix it.  Pointed out by Adrian Bunk.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-02-24 20:03:42 +01:00
Tobias Klauser 305183fc3e i2c: Storage class should be before const qualifier
The C99 specification states in section 6.11.5:

The placement of a storage-class specifier other than at the
beginning of the declaration specifiers in a declaration is an
obsolescent feature.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-02-24 20:03:42 +01:00
Wolfram Sang a92b36ed33 i2c-pxa: Misc fixes
While working on the PCA9564-platform driver, I sometimes had a glimpse at the
pxa-driver. I found some suspicious places, and this patch contains my
suggestions. Note: They are not tested, due to no hardware.

[JD: Some more fixes.]

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Tested-by: Mike Rapoport <mike@compulab.co.il>
Tested-by: Eric Miao <ymiao3@marvell.com>
2008-02-24 20:03:42 +01:00
Jean Delvare c9a2c46d7f ARM: OMAP: Release i2c_adapter after use (Siemens SX1)
Each call to i2c_get_adapter() must be followed by a call to
i2c_put_adapter() to release the grabbed reference. Otherwise the
reference count grows forever and the adapter can never be
unregistered.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Vladimir Ananiev <vovan888@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
2008-02-24 20:03:41 +01:00
Linus Torvalds 4fa2b1cde0 Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  libata-core: fix kernel-doc warning
  sata_fsl: fix build with ATA_VERBOSE_DEBUG
  [libata] ahci: AMD SB700/SB800 SATA support 64bit DMA
  libata-pmp: clear hob for pmp register accesses
  libata: automatically use DMADIR if drive/bridge requires it
  power_state: get rid of write-only variable in SATA
  pata_atiixp: Use 255 sector limit
2008-02-23 21:40:32 -08:00
Randy Dunlap 4cdfa1b3ce libata-core: fix kernel-doc warning
Fix libata-core kernel-doc warning:
Warning(linux-2.6.25-rc2-git6//drivers/ata/libata-core.c:168): No description found for parameter 'ap'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-02-24 00:28:48 -05:00
Anton Vorontsov b1f5dc48e2 sata_fsl: fix build with ATA_VERBOSE_DEBUG
This patch fixes build and few warnings when ATA_VERBOSE_DEBUG
is defined:

  CC      drivers/ata/sata_fsl.o
drivers/ata/sata_fsl.c: In function ‘sata_fsl_fill_sg’:
drivers/ata/sata_fsl.c:338: warning: format ‘%x’ expects type ‘unsigned int’, but argument 3 has type ‘void *’
drivers/ata/sata_fsl.c:338: warning: format ‘%x’ expects type ‘unsigned int’, but argument 4 has type ‘struct prde *’
drivers/ata/sata_fsl.c: In function ‘sata_fsl_qc_issue’:
drivers/ata/sata_fsl.c:459: error: ‘csr_base’ undeclared (first use in this function)
drivers/ata/sata_fsl.c:459: error: (Each undeclared identifier is reported only once
drivers/ata/sata_fsl.c:459: error: for each function it appears in.)
drivers/ata/sata_fsl.c: In function ‘sata_fsl_freeze’:
drivers/ata/sata_fsl.c:525: error: ‘csr_base’ undeclared (first use in this function)
make[2]: *** [drivers/ata/sata_fsl.o] Error 1

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-02-24 00:28:46 -05:00
Shane Huang e39fc8c9fd [libata] ahci: AMD SB700/SB800 SATA support 64bit DMA
SB700 SATA controller can support 64 bit DMA, the previous commit
badc234157 was added with
careless reference to SB600, which should be modified by this patch.

Signed-off-by: Shane Huang <shane.huang@amd.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-02-24 00:28:44 -05:00
Mark Lord 39f25e70ca libata-pmp: clear hob for pmp register accesses
>> Mark Lord wrote:
>>> Tejun, I've added PMP to sata_mv, and am now trying to get it
>>> to work with a Marvell PM attached.
>>>
>>> And the behaviour I see is very bizarre.
>>>
>>> After hard+soft resets, the PM signature is found,
>>> and libata interrogates the PM registers.
>>>
>>> It successfully reads register 0, and then register 1.
>>> But all subsequent registers read out (incorrectly) as zeros.
...

This behavior has been confirmed by Marvell with a SATA analyzer.
The Marvell port-multiplier apparently likes to see clean HOB
information when accessing PMP registers.

Since sata_mv uses PIO shadow register access, this doesn't happen
automatically, as it might in a more purely FIS-based driver (eg. ahci).

One way to fix this is to flag these commands with ATA_TFLAG_LBA48,
forcing libata to write out the HOB fields with known (zero) values.

Signed-off-by: Saeed Bishara <saeed@marvell.com>
Acked-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-02-24 00:28:23 -05:00
Tejun Heo 9116300634 libata: automatically use DMADIR if drive/bridge requires it
Back in 2.6.17-rc2, a libata module parameter was added for atapi_dmadir.

That's nice, but most SATA devices which need it will tell us about it
in their IDENTIFY PACKET response, as bit-15 of word-62 of the
returned data (as per ATA7, ATA8 specifications).

So for those which specify it, we should automatically use the DMADIR bit.
Otherwise, disc writing will fail by default on many SATA-ATAPI drives.

This patch adds ATA_DFLAG_DMADIR and make ata_dev_configure() set it
if atapi_dmadir is set or identify data indicates DMADIR is necessary.
atapi_xlat() is converted to check ATA_DFLAG_DMADIR before setting
DMADIR.

Original patch is from Mark Lord.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-02-24 00:27:33 -05:00
Pavel Machek 559bbe6cbd power_state: get rid of write-only variable in SATA
power_state is scheduled for removal, and libata uses it in write-only
mode. Remove it.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-02-24 00:27:26 -05:00
Alan Cox 635adc2808 pata_atiixp: Use 255 sector limit
AHCI needs sorting too but this deals with the old interface

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2008-02-24 00:27:23 -05:00
Linus Torvalds bdc0894289 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (37 commits)
  [NETFILTER]: fix ebtable targets return
  [IP_TUNNEL]: Don't limit the number of tunnels with generic name explicitly.
  [NET]: Restore sanity wrt. print_mac().
  [NEIGH]: Fix race between neighbor lookup and table's hash_rnd update.
  [RTNL]: Validate hardware and broadcast address attribute for RTM_NEWLINK
  tg3: ethtool phys_id default
  [BNX2]: Update version to 1.7.4.
  [BNX2]: Disable parallel detect on an HP blade.
  [BNX2]: More 5706S link down workaround.
  ssb: Fix support for PCI devices behind a SSB->PCI bridge
  zd1211rw: fix sparse warnings
  rtl818x: fix sparse warnings
  ssb: Fix pcicore cardbus mode
  ssb: Make the GPIO API reentrancy safe
  ssb: Fix the GPIO API
  ssb: Fix watchdog access for devices without a chipcommon
  ssb: Fix serial console on new bcm47xx devices
  ath5k: Fix build warnings on some 64-bit platforms.
  WDEV, ath5k, don't return int from bool function
  WDEV: ath5k, fix lock imbalance
  ...
2008-02-23 21:07:10 -08:00
Linus Torvalds 85b80ebfa4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  [SPARC64]: make IOMMU code respect the segment boundary limits
  [SPARC64]: Fix cpu trampoline et al. mismatch warnings.
  [SPARC64]: More sparse warning fixes in process.c
  [SPARC64]: Fix sparse warning wrt. fault_in_user_windows.
  [SPARC64]: Kill show_regs32().
  [SPARC64]: Fix sparse warnings wrt. __show_regs().
  [SPARC64]: Kill show_stackframe{,32}().
  [SPARC64]: Fix sparse warnings wrt. machine_alt_power_off().
2008-02-23 21:00:21 -08:00
Mirco Tischler 038eb0ea04 Fix u132-hcd.c compile error
This fixes the following compile error caused by commit
3a2d5b7001 ("PM: Introduce
PM_EVENT_HIBERNATE callback state")

    CC [M]  drivers/usb/host/u132-hcd.o
  drivers/usb/host/u132-hcd.c: In function ‘u132_suspend’:
  drivers/usb/host/u132-hcd.c:3224: error: expected expression before ‘int’
  drivers/usb/host/u132-hcd.c:3225: error: ‘ports’ undeclared (first use in this function)
  ...

Signed-off-by: Mirco Tischler <mt-ml@gmx.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 20:29:09 -08:00
Joonwoo Park 1b04ab4597 [NETFILTER]: fix ebtable targets return
The function ebt_do_table doesn't take NF_DROP as a verdict from the targets.

Signed-off-by: Joonwoo Park <joonwpark81@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 20:22:27 -08:00
Pavel Emelyanov 34cc7ba639 [IP_TUNNEL]: Don't limit the number of tunnels with generic name explicitly.
Use the added dev_alloc_name() call to create tunnel device name,
rather than iterate in a hand-made loop with an artificial limit.

Thanks Patrick for noticing this.

[ The way this works is, when the device is actually registered,
  the generic code noticed the '%' in the name and invokes
  dev_alloc_name() to fully resolve the name.  -DaveM ]

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 20:19:20 -08:00
David S. Miller 55b01e8681 [NET]: Restore sanity wrt. print_mac().
MAC_FMT had only one user and we tried to get rid of
that, but this created more problems than it solved.

As a result, this reverts three commits:

235365f3aa ("net/8021q/vlan_dev.c: Use
print_mac."), fea5fa875e ("[NET]: Remove
MAC_FMT"), and 8f789c4844 ("[NET]:
Elminate spurious print_mac() calls.")

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 20:09:11 -08:00
Pavel Emelyanov bc4bf5f38c [NEIGH]: Fix race between neighbor lookup and table's hash_rnd update.
The neigh_hash_grow() may update the tbl->hash_rnd value, which 
is used in all tbl->hash callbacks to calculate the hashval.

Two lookup routines may race with this, since they call the 
->hash callback without the tbl->lock held. Since the hash_rnd
is changed with this lock write-locked moving the calls to ->hash
under this lock read-locked closes this gap.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 19:57:02 -08:00
Thomas Graf 1840bb13c2 [RTNL]: Validate hardware and broadcast address attribute for RTM_NEWLINK
RTM_NEWLINK allows for already existing links to be modified. For this
purpose do_setlink() is called which expects address attributes with a
payload length of at least dev->addr_len. This patch adds the necessary
validation for the RTM_NEWLINK case.

The address length for links to be created is not checked for now as the
actual attribute length is used when copying the address to the netdevice
structure. It might make sense to report an error if less than addr_len
bytes are provided but enforcing this might break drivers trying to be
smart with not transmitting all zero addresses.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 19:54:36 -08:00
Stephen Hemminger 759afc3133 tg3: ethtool phys_id default
When asked to blink LEDs the tg3 driver behaves when using:
	ethtool -p ethX
The default value for data is zero, and other drivers interpret this
as blink forever (or at least a really long time).  The tg3 driver
interprets this as blink once.  All drivers should have the same
behaviour.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 19:51:59 -08:00
Michael Chan c73b1d1f26 [BNX2]: Update version to 1.7.4.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 19:49:48 -08:00
Oliver Pinter 42e6de0e60 fix vmsas.c file permissions
Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 19:49:34 -08:00
Michael Chan 38ea3686f6 [BNX2]: Disable parallel detect on an HP blade.
Because of some board issues, we need to disable parallel detect on
an HP blade.  Without this patch, the link state can become stuck
when it goes into parallel detect mode.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 19:48:57 -08:00
Michael Chan a2724e2559 [BNX2]: More 5706S link down workaround.
The previous patches to workaround the 5706S on an HP blade were not
sufficient.  The link state still does not change properly in some
cases.  This patch adds polling to make it completely reliable.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-02-23 19:47:44 -08:00
Linus Torvalds 04e2f1741d Add memory barrier semantics to wake_up() & co
Oleg Nesterov and others have pointed out that on some architectures,
the traditional sequence of

	set_current_state(TASK_INTERRUPTIBLE);
	if (CONDITION)
		return;
	schedule();

is racy wrt another CPU doing

	CONDITION = 1;
	wake_up_process(p);

because while set_current_state() has a memory barrier separating
setting of the TASK_INTERRUPTIBLE state from reading of the CONDITION
variable, there is no such memory barrier on the wakeup side.

Now, wake_up_process() does actually take a spinlock before it reads and
sets the task state on the waking side, and on x86 (and many other
architectures) that spinlock is in fact equivalent to a memory barrier,
but that is not generally guaranteed.  The write that sets CONDITION
could move into the critical region protected by the runqueue spinlock.

However, adding a smp_wmb() to before the spinlock should now order the
writing of CONDITION wrt the lock itself, which in turn is ordered wrt
the accesses within the spinlock (which includes the reading of the old
state).

This should thus close the race (which probably has never been seen in
practice, but since smp_wmb() is a no-op on x86, it's not like this will
make anything worse either on the most common architecture where the
spinlock already gave the required protection).

Acked-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 18:05:03 -08:00
Jeff Garzik 0a3716eb04 mvsas: fix build warning, clean prototypes
- Fix build 'make randconfig' build warning spotted by Toralf Foerster:

drivers/scsi/mvsas.c: In function 'mvs_hexdump':
drivers/scsi/mvsas.c:715: error: implicit declaration of function 'isalnum'

- Remove unneeded prototypes (spotted by hch)

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 17:52:36 -08:00
Oleg Nesterov 02c608c1fe documentation: atomic_add_unless() doesn't imply mb() on failure
(sorry for being offtpoic, but while experts are here...)

A "typical" implementation of atomic_add_unless() can return 0 immediately
after the first atomic_read() (before doing cmpxchg). In that case it doesn't
provide any barrier semantics. See include/asm-ia64/atomic.h as an example.

We should either change the implementation, or fix the docs.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 17:52:36 -08:00
Li Zefan 2dda81ca31 memcgroup: return negative error code in mem_cgroup_create()
Cgroup requires the subsystem to return negative error code on error in the
create method.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 17:13:25 -08:00
Li Zefan 7fde4c3eb7 memcgroup: remove a useless VM_BUG_ON()
Remove this VM_BUG_ON(), as Balbir stated:

We used to have a for loop with !list_empty() as a termination condition
and VM_BUG_ON(!pc) is a spill over.  With the new loop, VM_BUG_ON(!pc) does
not make sense.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Balbir Singh <balbir@in.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 17:13:25 -08:00
Li Zefan 2324c5dd47 memcgroup: fix and update documentation
- remove trailing " Bytes"s in the demonstration
- remove section 4.4 (feature control_type has been removed)
- fix reference section

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 17:13:25 -08:00
Li Zefan bc231d2a04 cgroup: remove dead code in cgroup_get_rootdir()
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-23 17:13:25 -08:00