Commit Graph

36428 Commits

Author SHA1 Message Date
David Daney
fbeda19f82 MIPS: Allow CPU specific overriding of CP0 hwrena impl bits.
Some CPUs have implementation dependent rdhwr registers.  Allow them
to be enabled on a per CPU basis.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:31 +01:00
David Daney
9cffd154cf MIPS: Kconfig Add SYS_SUPPORTS_HUGETLBFS and enable it for some systems.
Add new kconfig variables SYS_SUPPORTS_HUGETLBFS and
CPU_SUPPORTS_HUGEPAGES.  They are enabled for systems that are known
to support huge pages.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:31 +01:00
David Daney
fd062c847a MIPS: TLB support for hugetlbfs.
The TLB handlers need to check for huge pages and give them special
handling.  Huge pages consist of two contiguous sub-pages of physical
memory.

* Loading entrylo0 and entrylo1 need to be handled specially.

* The page mask must be set for huge pages and then restored after
  writing the TLB entries.

* The PTE for huge pages resides in the PMD, we halt traversal of the
  tables there.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:30 +01:00
David Daney
dd7943920b MIPS: Add hugetlbfs page defines.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:30 +01:00
David Daney
50a41ff292 MIPS: Add support files for hugetlbfs.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:30 +01:00
David Daney
bd1437e49d MIPS: Remove unused parameters from iPTE_LW.
The l parameter to iPTE_LW() is unused. Remove it and from some of its
callers as well.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:30 +01:00
David Daney
38295fb2a0 MIPS: Export erratum function needed by octeon-ethernet driver.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:29 +01:00
David Daney
f1f1f5902b MIPS: Cavium-Octeon: Add more chip specific feature tests.
The octeon-ethernet driver needs to check for additional chip specific
features, we add them to the octeon_has_feature() framework.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:29 +01:00
David Daney
2b1b62e841 MIPS: Cavium-Octeon: Add more board type constants.
The bootloader now uses additional board type constants.  The
octeon-ethernet driver needs some of the new values.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:29 +01:00
David Daney
3e903bd9b1 MIPS: Export cvmx_sysinfo_get needed by octeon-ethernet driver.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:29 +01:00
David Daney
6fa044ab8a MIPS: Add named alloc functions to OCTEON boot monitor memory allocator.
The various Octeon ethernet drivers use these new functions.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:29 +01:00
Manuel Lauss
ce65cc8fe2 MIPS: Alchemy: devboards: Convert to gpio calls.
Replace a few open-coded GPIO register accesses with gpio calls.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:29 +01:00
Manuel Lauss
b6c9f10517 MIPS: Alchemy: xxs1500: use linux gpio api.
Replace a few GPIO register accesses in the board init code with calls to
the gpio api.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:29 +01:00
Manuel Lauss
bb706b28bb MIPS: Alchemy: MTX-1: Use linux gpio api.
Replace a few GPIO register accesses in the board init code with calls
to the gpio api.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:28 +01:00
Manuel Lauss
51e02b02e6 MIPS: Alchemy: Rewrite GPIO support.
The current in-kernel Alchemy GPIO support is far too inflexible for
all my use cases.  To address this, the following changes are made:

* create generic functions which deal with manipulating the on-chip
  GPIO1/2 blocks.  Such functions are universally useful.
* Macros for GPIO2 shared interrupt management and block control.
* support for both built-in CONFIG_GPIOLIB and fast, inlined GPIO macros.

  If CONFIG_GPIOLIB is not enabled, provide linux gpio framework
  compatibility by directly inlining the GPIO1/2 functions.  GPIO access
  is limited to on-chip ones and they can be accessed as documented in
  the datasheets (GPIO0-31 and 200-215).

  If CONFIG_GPIOLIB is selected, two (2) gpio_chip-s, one for GPIO1 and
  one for GPIO2, are registered.  GPIOs can still be accessed by using
  the numberspace established in the databooks.

  However this is not yet flexible enough for my uses:  My Alchemy
  systems have a documented "external" gpio interface (fixed, different
  numberspace) and can support a variety of baseboards, some of which
  are equipped with I2C gpio expanders.  I want to be able to provide
  the default 16 GPIOs of the CPU board numbered as 0..15 and also
  support gpio expanders, if present, starting as gpio16.

  To achieve this, a new Kconfig symbol for Alchemy is introduced,
  CONFIG_ALCHEMY_GPIO_INDIRECT, which boards can enable to signal
  that they don't want the Alchemy numberspace exposed to the outside
  world, but instead want to provide their own.  Boards are now respon-
  sible for providing the linux gpio interface glue code (either in a
  custom gpio.h header (in board include directory) or with gpio_chips).

  To make the board-specific inlined gpio functions work, the MIPS
  Makefile must be changed so that the mach-au1x00/gpio.h header is
  included _after_ the board headers, by moving the inclusion of
  the mach-au1x00/ to the end of the header list.

  See arch/mips/include/asm/mach-au1x00/gpio.h for more info.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:28 +01:00
Manuel Lauss
eeb09e6545 MIPS: Alchemy: Remove unused au1000_gpio.h header
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:28 +01:00
Matthieu Castet
f203b7cacb MIPS: BCM47xx: Fix gpio_direction_output
gpio_direction_output should also set an output value according to the API.

Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr> 
Acked-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:28 +01:00
Ralf Baechle
cc906f8e23 MIPS: ioctl.h: Cleanup.
o Rewrite to use <asm-generic/ioctl.h>.  Cuts down the file from 40 to
   16 lines.
 o Delete _IOC_VOID, _IOC_OUT, _IOC_IN and _IOC_INOUT.  They were added
   for 2.1.14 but I was not able to find any user - not even historical
   ones.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:28 +01:00
Atsushi Nemoto
923e381900 MIPS: TXx9: Add TX4939 RNG support
Add platform support for RNG of TX4939 SoC.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:27 +01:00
Atsushi Nemoto
c3b28ae260 MIPS: TXx9: Add SRAMC support
Add a sysdev to access SRAM in TXx9 SoCs via sysfs.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:27 +01:00
Imre Kaloz
05f94eebd5 MIPS: Sibyte: Remove standalone kernel support
CFE is the only supported and used bootloader on the SiByte boards,
the standalone kernel support has been never used outside Broadcom.
Remove it and make the kernel use CFE by default.

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:27 +01:00
Imre Kaloz
435f81f4a2 MIPS: Sibyte: Remove simulator option
This patch removes the SiByte simulation Kconfig option, which only modified
a printk.

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:27 +01:00
Florian Fainelli
d36773e53f MIPS: RB532: Check irq number when handling GPIO interrupts
This patch makes sure that we are not going to clear
or change the interrupt status of a GPIO interrupt
superior to 13 as this is the maximum number of GPIO
interrupt source (p.232 of the RC32434 reference manual).

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:27 +01:00
Florian Fainelli
1c99dac8bf MIPS: RB532: Cleanup cpu-features-overrides
Remove commented out definitions.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:26 +01:00
David Daney
faed5288af MIPS: Remove dead case label.
CPU_CAVIUM_OCTEON is mips_r2 which is handled before the switch.  This
label in the switch statement is dead code, so we remove it.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Reviewed by: David VomLehn <dvomlehn@cisco.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:26 +01:00
David Daney
9e290a19f2 MIPS: Remove execution hazard barriers for Octeon.
The Octeon has no execution hazards, so we can remove them and save an
instruction per TLB handler invocation.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Reviewed by: David VomLehn <dvomlehn@cisco.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:26 +01:00
David Daney
41f0e4d041 MIPS: Allow R2 CPUs to turn off generation of 'ehb' instructions.
Some CPUs do not need ehb instructions after writing CP0 registers.
By allowing ehb generation to be overridden in
cpu-feature-overrides.h, we can save a few instructions in the TLB
handler hot paths.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:26 +01:00
David Daney
95affdda9b MIPS: Fold the TLB refill at the vmalloc path if possible.
Try to fold the 64-bit TLB refill handler opportunistically at the
beginning of the vmalloc path so as to avoid splitting execution flow in
half and wasting cycles for a branch required at that point then.  Resort
to doing the split if either of the newly created parts would not fit into
its designated slot.

Original-patch-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:26 +01:00
David Daney
e6f72d3aba MIPS: Replace some magic numbers with symbolic values in tlbex.c
The logic used to split the r4000 refill handler is liberally
sprinkled with magic numbers.  We attempt to explain what they are and
normalize them against a new symbolic value (MIPS64_REFILL_INSNS).

CC: David VomLehn <dvomlehn@cisco.com>
Reviewed-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:25 +01:00
Atsushi Nemoto
742cd5867b MIPS: TXx9: Add ACLC support
Add platform support for ACLC of TXx9 SoCs.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:25 +01:00
David Daney
e8635b484f MIPS: Add Cavium OCTEON PCI support.
This patch adds support for PCI and PCIe to the base Cavium OCTEON
processor support.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:25 +01:00
David Daney
8860fb8210 MIPS: Add register definitions for PCI.
Here we add the register definitions for the processor blocks used by
the following PCI support patch.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:25 +01:00
Atsushi Nemoto
f48c8c958a MIPS: TXx9: Add DMAC support
Add platform support for DMAC of TXx9 SoCs.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:25 +01:00
Atsushi Nemoto
ea76f0b375 DMA: TXx9 Soc DMA Controller driver
This patch adds support for the integrated DMAC of the TXx9 family.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:25 +01:00
Atsushi Nemoto
a43da03ca4 MIPS: TXx9: micro optimization for clocksource and clock_event
Use container structure for clocksource, clock_event_device and hold a
pointer to txx9_tmr_reg in it.

This saves a few instructions in clocksource and clock_event handlers.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:25 +01:00
Kevin Cernekee
605b7ef7b7 MIPS: Support 64-byte D-cache line size
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:24 +01:00
Kevin Cernekee
3807ef3f61 MIPS: Pass struct device to plat_dma_addr_to_phys()
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:24 +01:00
Kevin Cernekee
d3f634b96a MIPS: Add size and direction arguments to plat_unmap_dma_mem()
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:24 +01:00
Ralf Baechle
7762f206a3 MIPS: SB1250: Sort out merge mistake.
A wrong resolution of a merge conflict made the recently deleted wrong
error check in sb1250_set_affinity.  Send the zombie back to the empire
of the undead.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:24 +01:00
Atsushi Nemoto
3cb3a66cf7 MIPS: Fix __ndelay build error and add 'ull' suffix for 32-bit kernel
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:24 +01:00
Ralf Baechle
dbc1d911b4 MIPS: SMTC: Fix formatting difference to linux-mips.org code
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:24 +01:00
Ralf Baechle
39027ff07b MIPS: Fix typo resulting in far too long ndelay times.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-06-17 11:06:23 +01:00
Linus Torvalds
0dd5198672 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (425 commits)
  V4L/DVB (11870): gspca - main: VIDIOC_ENUM_FRAMESIZES ioctl added.
  V4L/DVB (12004): poll method lose race condition
  V4L/DVB (11894): flexcop-pci: dmesg visible names broken
  V4L/DVB (11892): Siano: smsendian - declare function as extern
  V4L/DVB (11891): Siano: smscore - bind the GPIO SMS protocol
  V4L/DVB (11890): Siano: smscore - remove redundant code
  V4L/DVB (11889): Siano: smsdvb - add DVB v3 events
  V4L/DVB (11888): Siano: smsusb - remove redundant ifdef
  V4L/DVB (11887): Siano: smscards - add board (target) events
  V4L/DVB (11886): Siano: smscore - fix some new GPIO definitions names
  V4L/DVB (11885): Siano: Add new GPIO management interface
  V4L/DVB (11884): Siano: smssdio - revert to stand alone module
  V4L/DVB (11883): Siano: cards - add two additional (USB) devices
  V4L/DVB (11824): Siano: smsusb - change exit func debug msg
  V4L/DVB (11823): Siano: smsusb - fix typo in module description
  V4L/DVB (11822): Siano: smscore - bug fix at get_device_mode
  V4L/DVB (11821): Siano: smscore - fix isdb-t firmware name
  V4L/DVB (11820): Siano: smscore - fix byte ordering bug
  V4L/DVB (11819): Siano: smscore - fix get_common_buffer bug
  V4L/DVB (11818): Siano: smscards - assign gpio to HPG targets
  ...
2009-06-16 21:15:42 -07:00
Linus Torvalds
517d08699b Merge branch 'akpm'
* akpm: (182 commits)
  fbdev: bf54x-lq043fb: use kzalloc over kmalloc/memset
  fbdev: *bfin*: fix __dev{init,exit} markings
  fbdev: *bfin*: drop unnecessary calls to memset
  fbdev: bfin-t350mcqb-fb: drop unused local variables
  fbdev: blackfin has __raw I/O accessors, so use them in fb.h
  fbdev: s1d13xxxfb: add accelerated bitblt functions
  tcx: use standard fields for framebuffer physical address and length
  fbdev: add support for handoff from firmware to hw framebuffers
  intelfb: fix a bug when changing video timing
  fbdev: use framebuffer_release() for freeing fb_info structures
  radeon: P2G2CLK_ALWAYS_ONb tested twice, should 2nd be P2G2CLK_DAC_ALWAYS_ONb?
  s3c-fb: CPUFREQ frequency scaling support
  s3c-fb: fix resource releasing on error during probing
  carminefb: fix possible access beyond end of carmine_modedb[]
  acornfb: remove fb_mmap function
  mb862xxfb: use CONFIG_OF instead of CONFIG_PPC_OF
  mb862xxfb: restrict compliation of platform driver to PPC
  Samsung SoC Framebuffer driver: add Alpha Channel support
  atmel-lcdc: fix pixclock upper bound detection
  offb: use framebuffer_alloc() to allocate fb_info struct
  ...

Manually fix up conflicts due to kmemcheck in mm/slab.c
2009-06-16 19:50:13 -07:00
Geert Uytterhoeven
ae52bb2384 fbdev: move logo externs to header file
Now we have __initconst, we can finally move the external declarations for
the various Linux logo structures to <linux/linux_logo.h>.

James' ack dates back to the previous submission (way to long ago), when the
logos were still __initdata, which caused failures on some platforms with some
toolchain versions.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: James Simmons <jsimmons@infradead.org>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:57 -07:00
Randy Dunlap
e4c9dd0fba kmap_types: make most arches use generic header file
Convert most arches to use asm-generic/kmap_types.h.

Move the KM_FENCE_ macro additions into asm-generic/kmap_types.h,
controlled by __WITH_KM_FENCE from each arch's kmap_types.h file.

Would be nice to be able to add custom KM_types per arch, but I don't yet
see a nice, clean way to do that.

Built on x86_64, i386, mips, sparc, alpha(tonyb), powerpc(tonyb), and
68k(tonyb).

Note: avr32 should be able to remove KM_PTE2 (since it's not used) and
then just use the generic kmap_types.h file.  Get avr32 maintainer
approval.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: <linux-arch@vger.kernel.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Bryan Wu <cooloney@kernel.org>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: "Luck Tony" <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:51 -07:00
Minchan Kim
a9c5695393 use printk_once() in several places
There are some places to be able to use printk_once instead of hard coding.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: David S. Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:50 -07:00
Thomas Gleixner
8b0b1db013 remove put_cpu_no_resched()
put_cpu_no_resched() is an optimization of put_cpu() which unfortunately
can cause high latencies.

The nfs iostats code uses put_cpu_no_resched() in a code sequence where a
reschedule request caused by an interrupt between the get_cpu() and the
put_cpu_no_resched() can delay the reschedule for at least HZ.

The other users of put_cpu_no_resched() optimize correctly in interrupt
code, but there is no real harm in using the put_cpu() function which is
an alias for preempt_enable().  The extra check of the preemmpt count is
not as critical as the potential source of missing a reschedule.

Debugged in the preempt-rt tree and verified in mainline.

Impact: remove a high latency source

[akpm@linux-foundation.org: build fix]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:48 -07:00
Roel Kluin
b08cd961cc uml: bad macro expansion, parameter is member
`ELF_CORE_COPY_REGS(x, y)' will make expansions like:
`(y)[0] = (x)->x.gp[0]' but correct is `(y)[0] = (x)->regs.gp[0]'

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: WANG Cong <amwang@redhat.com>
Cc: Jeff Dike <jdike@addtoit.com>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:47 -07:00
Amerigo Wang
276c974ac7 uml: fix a section warning
When compiling uml on x86_64:

  MODPOST vmlinux.o
WARNING: vmlinux.o (.__syscall_stub.2): unexpected non-allocatable section.
Did you forget to use "ax"/"aw" in a .S file?
Note that for example <linux/init.h> contains
section definitions for use in .S files.

Because modpost checks for missing SHF_ALLOC section flag.  So just add
it.

Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 19:47:47 -07:00