Commit Graph

649 Commits

Author SHA1 Message Date
Jake Moilanen
d637413f3f [PATCH] ppc64: reverse prediction on spinlock busy loop code
On our raw spinlocks, we currently have an attempt at the lock, and if we do
not get it we enter a spin loop.  This spinloop will likely continue for
awhile, and we pridict likely.

Shouldn't we predict that we will get out of the loop so our next instructions
are already prefetched.  Even when we miss because the lock is still held, it
won't matter since we are waiting anyways.

I did a couple quick benchmarks, but the results are inconclusive.

	16-way 690 running specjbb with original code
	# ./specjbb 3000 16 1 1 19 30 120
	    ...
	Valid run, Score is 59282

	16-way 690 running specjbb with unlikely code
	# ./specjbb 3000 16 1 1 19 30 120
	    ...
	Valid run, Score is 59541

I saw a smaller increase on a JS20 (~1.6%)

	JS20 specjbb w/ original code
	# ./specjbb 400 2 1 1 19 30 120
	   ...
	Valid run, Score is 20460

	JS20 specjbb w/ unlikely code
	# ./specjbb 400 2 1 1 19 30 120
	   ...
	Valid run, Score is 20803

Anton said:

Mispredicting the spinlock busy loop also means we slow down the rate at which
we do the loads which can be good for heavily contended locks.

Note: There are some gcc issues with our default build and branch prediction,
but a CONFIG_POWER4_ONLY build should emit them correctly.  I'm working with
Alan Modra on it now.

Signed-off-by: Jake Moilanen <moilanen@austin.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:47 -07:00
akpm@osdl.org
d59dd4620f [PATCH] use smp_mb/wmb/rmb where possible
Replace a number of memory barriers with smp_ variants.  This means we won't
take the unnecessary hit on UP machines.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:47 -07:00
Anton Blanchard
0d8d4d42f2 [PATCH] ppc64: use smp_mb and smp_wmb
Use smp_mb and smp_wmb. In particular smp_wmb is lighter weight than wmb.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:47 -07:00
Anton Blanchard
eeb24de431 [PATCH] ppc64: enforce medium thread priority in hypervisor calls
Calls into the hypervisor do not raise the thread priority.  Ensure we are
running at medium priority upon entry to the hypervisor.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:46 -07:00
Anton Blanchard
c4005e4f66 [PATCH] ppc64: firmware workaround
Recent gcc 4.0 testing uncovered a firmware issue.  Some properties are larger
than 31 bytes and due to gcc 4.0s better stack allocation this overflow ran
over non volatile register storage.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:46 -07:00
Anton Blanchard
4b88e927e8 [PATCH] ppc64: remove unnecessary include
We no longer use any ppcdebug stuff in a.out.h, so remove the define.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:46 -07:00
Anton Blanchard
a2f95a5ae9 [PATCH] ppc64: noexec fixes
There were a few issues with the ppc64 noexec support:

The 64bit ABI has a non executable stack by default.  At the moment 64bit apps
require a PT_GNU_STACK section in order to have a non executable stack.

Disable the read implies exec workaround on the 64bit ABI.  The 64bit
toolchain has never had problems with incorrect mmap permissions (the 32bit
has, thats why we need to retain the workaround).

With these fixes as well as a gcc fix from Alan Modra (that was recently
committed) 64bit apps work as expected.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:45 -07:00
Olof Johansson
d03853d566 [PATCH] PPC64: Remove hot busy-wait loop in __hash_page
It turns out that our current __hash_page code will do a very hot busy-wait
loop waiting on _PAGE_BUSY to be cleared.  It even does ldarx/stdcx in the
loop, which will bounce reservations around like crazy if there's more than
one CPU spinning on the same PTE (or even another PTE in the same
reservation granule).  The end result is that each fault takes longer when
there's contention, which in turn increases the chance of another thread
hitting the same fault and also piling up.  Not pretty.

There's two options here:
1. Do an out-of-line busy loop a'la spinlocks with just loads (no
   reserves)
2. Just bail and refault if needed.

(2) makes sense here: If the PTE is busy, chances are it's in flux anyway
and the other code path making a change might just be ready to hash it.

This fixes a stampede seen on a large-ish system where a multithreaded
HPC app faults in the same text pages on several cpus at the same time.

Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:45 -07:00
Paul Mackerras
66faf9845a [PATCH] ppc64: tell firmware about kernel capabilities
On pSeries systems, according to the platform architecture specs, we are
supposed to be supplying a structure to firmware that tells firmware about
our capabilities, such as which version of the data structures that
describe available memory we are expecting to see.  The way we end up
having to supply this data structure is a bit gross, since it was designed
for AIX and doesn't suit us very well.  This patch adds the code to supply
this data structure to the firmware.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:45 -07:00
Benjamin Herrenschmidt
58366af586 [PATCH] ppc64: update to use the new 4L headers
This patch converts ppc64 to use the generic pgtable-nopud.h instead of the
"fixup" header.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:44 -07:00
akpm@osdl.org
0339ad77c4 [PATCH] ppc64: nvram cleanups
- Fix

  arch/ppc64/kernel/nvram.c:342: warning: `part' might be used uninitialized in this function

- Various codingstyle tweaks.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:44 -07:00
Paul Mackerras
dc3ec7503e [PATCH] ppc64: Fix irq parsing on powermac
When I tried Ben's patches to the powermac sound driver on my G5, I found
that it was taking enormous numbers of sound DMA transmit interrupts.  This
turned out to be because it was incorrectly configured as level-sensitive
instead of edge-sensitive, which in turn was because the code that parses
the interrupt tree that Open Firmware gives us was incorrectly assigning
another device the same irq number as the sound DMA transmit interrupt
(i.e.  1).

This patch fixes the problem, in a somewhat quick and dirty way for now,
but one which will work for all the machines we currently run on.
Ultimately Ben and I want to do something more general and robust, but this
should go in for 2.6.12.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:44 -07:00
Olof Johansson
bb78cb7220 [PATCH] ppc64: remove unused argument to create_slbe
Remove vsid argument to create_slbe, since it's no longer used.

Spotted by R Sharada.

Signed-off-by: Olof Johansson <olof@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:44 -07:00
Benjamin Herrenschmidt
1b29f9d13e [PATCH] ppc64: add PT_NOTE section to vDSO
This patch from Roland adds a PT_NOTE section to both 32 and 64 bits vDSOs
to expose the kernel version to glibc, thus avoiding a uname syscall on
every launch.  This is equivalent to the patches Roland posted already for
x86 and x86-64.

Note: the 64 bits .note is actually using the 32 bits format.  This is
normal.  The ELF spec specifies a different format for 64 bits .note, but
for some reason, this was never properly implemented, the core dumps for
example are all using 32 bits format .note, and binutils cannot even read a
64 bits format .note.  Talking to our toolchain folks, they think we'd
rather stick to 32 bits format .note everywhere and get the spec fixed some
day ...

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:43 -07:00
Colin Leroy
085e6fc96b [PATCH] pmac: save master volume on sleep
Ben's patch that shutdowns master switch and restores it after resume
("pmac: Improve sleep code of tumbler driver") isn't enough here on an
iBook (snapper chip).

The master switch is correctly saved and restored, but somehow
tumbler_put_master_volume() gets called just after
tumbler_set_master_volume() and sets mix->master_vol[*] to 0.  So, on
resuming, the master switch is reenabled, but the volume is set to 0.

Here's a patch that also saves and restores master_vol.

Signed-off-by: Colin Leroy <colin@colino.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:43 -07:00
Benjamin Herrenschmidt
1f7b49d042 [PATCH] ppc32: add sound support for Mac Mini
This patch applies on top of my previous g5 related sound patches and adds
support for the Mac Mini to the PowerMac Alsa driver.

However, I haven't found any kind of HW support for volume control on this
machine.  If it exist, it's well hidden.  That means that you probably want
to make sure you use software with the ability to do soft volume control,
or use Alsa 0.9 pre-release with the softvol plugin.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:43 -07:00
Benjamin Herrenschmidt
4be8dc7ff6 [PATCH] ppc64: improve g5 sound headphone mute
This patch fixes a couple more issues with the management of the GPIOs
dealing with headphone and line out mute on the G5.  It should fix the
remaining problems of people not getting any sound out of the headphone
jack.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:43 -07:00
Dan Malek
1bdacf88eb [PATCH] ppc32: workaround for spurious IRQs on PQ2
There is a problem with large amounts of spurious IRQs on PowerPC 82xx
systems.

The problem is corrected by adding sync at the end of cpm2_mask_and_ack.
This may be needed on 8xx as well but has not yet been confirmed.

Signed-off-by: Eugene Surovegin <ebs@ebshome.net>
Signed-off-by: Dan Malek <dan@embeddedalley.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:42 -07:00
Paul Mackerras
d5812a77e5 [PATCH] ppc32: Fix address checking on lmw/stmw align exception
The handling of misaligned load/store multiple instructions did not check
to see if the address was ok to access before using __{get,put}_user().

Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:42 -07:00
Benjamin Herrenschmidt
b20cc8aff2 [PATCH] ppc32: Fix a sleep issues on some laptops
Some earlier models of aluminium powerbooks and ibook G4s have a clock chip
that requires some tweaking before and after sleep.  It seems that without
that magic incantation to disable and re-enable clock spreading, RAM isn't
properly refreshed during sleep.  This fixes it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:42 -07:00
Andreas Jaggi
146a4b3bdf [PATCH] macintosh/adbhid.c: adb buttons support for aluminium PowerBook G4
This patch adds support for the special adb buttons of the aluminium
PowerBook G4.

Signed-off-by: Andreas Jaggi <andreas.jaggi@waterwave.ch>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:41 -07:00
Benjamin Herrenschmidt
616299afce [PATCH] ppc32: Fix IDE related crash on wakeup
I noticed an occasional crash on wakeup from sleep on my powerbook
(strangly never happened before, probably timing related) that appears to
be due to a dangling interrupt while the chip is put to sleep and beeing
reset on wakeup.

This patch fixes is by disabling the irq in the ide pmac driver while
asleep and only re-enable it after the chip has been fully reset.  This is
safe to do so as the interrupt of these apple IDE cells is never shared.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:41 -07:00
Chris Elston
a497aa20e5 [PATCH] ppc32: add rtc hooks in PPC7D platform file
This patch adds the hooks into the PPC7D platforms file to support the DS1337
RTC device as the clock device for the PPC7D board.

Signed-off-by: Chris Elston <chris.elston@radstone.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:41 -07:00
Chris Elston
630710e3f7 [PATCH] ppc32: fix for misreported SDRAM size on Radstone PPC7D platform
This patch fixes the SDRAM output from /proc/cpuinfo.  The previous code
assumed that there was only one bank of SDRAM, and that the size in the memory
configuration register was the total size.

Signed-off-by: Chris Elston <chris.elston@radstone.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:40 -07:00
Paul Mackerras
443a848cd3 [PATCH] ppc32: refactor FPU exception handling
Moved common FPU exception handling code out of head.S so it can be used by
several of the sub-architectures that might of a full PowerPC FPU.

Also, uses new CONFIG_PPC_FPU define to fix alignment exception handling
for floating point load/store instructions to only occur if we have a
hardware FPU.

Signed-off-by: Jason McMullan <jason.mcmullan@timesys.com>
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:40 -07:00
Benjamin Herrenschmidt
f1c55dea0b [PATCH] ppc32: Fix errata for some G3 CPUs
Some G3 CPUs can crash in funny way if a store from an FPU register
instruction is executed on a register that has never been initialized since
power on.  This patch fixes it by making sure all FP registers have been
properly initialized at kernel boot and when waking from sleep.  It also makes
the code that decides wether HID0_BTIC and HID0_DPM are allowed on a given CPU
smarter (it can actually _clear_ them now if they are not allowed instead of
just setting them when they are allowed in case the firmware got them wrong)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:40 -07:00
James Morris
b207a290ea [PATCH] SELinux: add finer grained permissions to Netlink audit processing
This patch provides finer grained permissions for the audit family of
Netlink sockets under SELinux.

1.  We need a way to differentiate between privileged and unprivileged
   reads of kernel data maintained by the audit subsystem.  The AUDIT_GET
   operation is unprivileged: it returns the current status of the audit
   subsystem (e.g.  whether it's enabled etc.).  The AUDIT_LIST operation
   however returns a list of the current audit ruleset, which is considered
   privileged by the audit folk.  To deal with this, a new SELinux
   permission has been implemented and applied to the operation:
   nlmsg_readpriv, which can be allocated to appropriately privileged
   domains.  Unprivileged domains would only be allocated nlmsg_read.

2.  There is a requirement for certain domains to generate audit events
   from userspace.  These events need to be collected by the kernel,
   collated and transmitted sequentially back to the audit daemon.  An
   example is user level login, an auditable event under CAPP, where
   login-related domains generate AUDIT_USER messages via PAM which are
   relayed back to auditd via the kernel.  To prevent handing out
   nlmsg_write permissions to such domains, a new permission has been
   added, nlmsg_relay, which is intended for this type of purpose: data is
   passed via the kernel back to userspace but no privileged information is
   written to the kernel.

Also, AUDIT_LOGIN messages are now valid only for kernel->user messaging,
so this value has been removed from the SELinux nlmsgtab (which is only
used to check user->kernel messages).

Signed-off-by: James Morris <jmorris@redhat.com>
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:40 -07:00
Stephen Smalley
6af963f1d6 [PATCH] SELinux: cleanup ipc_has_perm
This patch removes the sclass argument from ipc_has_perm in the SELinux
module, as it can be obtained from the ipc security structure.  The use of
a separate argument was a legacy of the older precondition function
handling in SELinux and is obsolete.  Please apply.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:39 -07:00
akpm@osdl.org
de7d5a3b6c [PATCH] drop_buffers() oops fix
In rare situations, drop_buffers() can be called for a page which has buffers,
but no ->mapping (it was truncated, but the buffers were left behind because
ext3 was still fiddling with them).

But if there was an I/O error in a buffer_head, drop_buffers() will try to get
at the address_space and will oops.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:39 -07:00
Nikita Danilov
552fca4cbe [PATCH] mpage_writepages() page locking fix
When ->writepage() returns WRITEPAGE_ACTIVATE, the page is still locked.
Explicitly unlock the page in mpage_writepages().

Signed-off-by: Nikita Danilov <nikita@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:39 -07:00
Manfred Spraul
97e2bde47f [PATCH] add kmalloc_node, inline cleanup
The patch makes the following function calls available to allocate memory
on a specific node without changing the basic operation of the slab
allocator:

 kmem_cache_alloc_node(kmem_cache_t *cachep, unsigned int flags, int node);
 kmalloc_node(size_t size, unsigned int flags, int node);

in a similar way to the existing node-blind functions:

 kmem_cache_alloc(kmem_cache_t *cachep, unsigned int flags);
 kmalloc(size, flags);

kmem_cache_alloc_node was changed to pass flags and the node information
through the existing layers of the slab allocator (which lead to some minor
rearrangements).  The functions at the lowest layer (kmem_getpages,
cache_grow) are already node aware.  Also __alloc_percpu can call
kmalloc_node now.

Performance measurements (using the pageset localization patch) yields:

w/o patches:
Tasks    jobs/min  jti  jobs/min/task      real       cpu
    1      484.27  100       484.2736     12.02      1.97   Wed Mar 30 20:50:43 2005
  100    25170.83   91       251.7083     23.12    150.10   Wed Mar 30 20:51:06 2005
  200    34601.66   84       173.0083     33.64    294.14   Wed Mar 30 20:51:40 2005
  300    37154.47   86       123.8482     46.99    436.56   Wed Mar 30 20:52:28 2005
  400    39839.82   80        99.5995     58.43    580.46   Wed Mar 30 20:53:27 2005
  500    40036.32   79        80.0726     72.68    728.60   Wed Mar 30 20:54:40 2005
  600    44074.21   79        73.4570     79.23    872.10   Wed Mar 30 20:55:59 2005
  700    44016.60   78        62.8809     92.56   1015.84   Wed Mar 30 20:57:32 2005
  800    40411.05   80        50.5138    115.22   1161.13   Wed Mar 30 20:59:28 2005
  900    42298.56   79        46.9984    123.83   1303.42   Wed Mar 30 21:01:33 2005
 1000    40955.05   80        40.9551    142.11   1441.92   Wed Mar 30 21:03:55 2005

with pageset localization and slab API patches:
Tasks    jobs/min  jti  jobs/min/task      real       cpu
    1      484.19  100       484.1930     12.02      1.98   Wed Mar 30 21:10:18 2005
  100    27428.25   92       274.2825     21.22    149.79   Wed Mar 30 21:10:40 2005
  200    37228.94   86       186.1447     31.27    293.49   Wed Mar 30 21:11:12 2005
  300    41725.42   85       139.0847     41.84    434.10   Wed Mar 30 21:11:54 2005
  400    43032.22   82       107.5805     54.10    582.06   Wed Mar 30 21:12:48 2005
  500    42211.23   83        84.4225     68.94    722.61   Wed Mar 30 21:13:58 2005
  600    40084.49   82        66.8075     87.12    873.11   Wed Mar 30 21:15:25 2005
  700    44169.30   79        63.0990     92.24   1008.77   Wed Mar 30 21:16:58 2005
  800    43097.94   79        53.8724    108.03   1155.88   Wed Mar 30 21:18:47 2005
  900    41846.75   79        46.4964    125.17   1303.38   Wed Mar 30 21:20:52 2005
 1000    40247.85   79        40.2478    144.60   1442.21   Wed Mar 30 21:23:17 2005

Signed-off-by: Christoph Lameter <christoph@lameter.com>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:38 -07:00
William Lee Irwin III
dd1d5afca8 [PATCH] sync_page() smp_mb() comment
The smp_mb() is becaus sync_page() doesn't have PG_locked while it accesses
page_mapping(page).  The comments in the patch (the entire patch is the
addition of this comment) try to explain further how and why smp_mb() is
used.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:38 -07:00
Chris Wright
93ea1d0a12 [PATCH] RLIMIT_MEMLOCK checking fix
Always use page counts when doing RLIMIT_MEMLOCK checking to avoid possible
overflow.

Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:38 -07:00
KAMEZAWA Hiroyuki
edfbe2b003 [PATCH] count bounce buffer pages in vmstat
This is a patch for counting the number of pages for bounce buffers.  It's
shown in /proc/vmstat.

Currently, the number of bounce pages are not counted anywhere.  So, if
there are many bounce pages, it seems that there are leaked pages.  And
it's difficult for a user to imagine the usage of bounce pages.  So, it's
meaningful to show # of bouce pages.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:37 -07:00
Nikita Danilov
2054606ad6 [PATCH] doc: Locking update
Make the Locking document truer.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:37 -07:00
Nick Piggin
bd53b714d3 [PATCH] mm: use __GFP_NOMEMALLOC
Use the new __GFP_NOMEMALLOC to simplify the previous handling of
PF_MEMALLOC.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:37 -07:00
Nick Piggin
20a77776c2 [PATCH] mempool: simplify alloc
Mempool is pretty clever.  Looks too clever for its own good :) It
shouldn't really know so much about page reclaim internals.

- don't guess about what effective page reclaim might involve.

- don't randomly flush out all dirty data if some unlikely thing
  happens (alloc returns NULL). page reclaim can (sort of :P) handle
  it.

I think the main motivation is trying to avoid pool->lock at all costs.
However the first allocation is attempted with __GFP_WAIT cleared, so it
will be 'can_try_harder' if it hits the page allocator.  So if allocation
still fails, then we can probably afford to hit the pool->lock - and what's
the alternative?  Try page reclaim and hit zone->lru_lock?

A nice upshot is that we don't need to do any fancy memory barriers or do
(intentionally) racy access to pool-> fields outside the lock.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:37 -07:00
Nick Piggin
b84a35be02 [PATCH] mempool: NOMEMALLOC and NORETRY
Mempools have 2 problems.

The first is that mempool_alloc can possibly get stuck in __alloc_pages
when they should opt to fail, and take an element from their reserved pool.

The second is that it will happily eat emergency PF_MEMALLOC reserves
instead of going to their reserved pools.

Fix the first by passing __GFP_NORETRY in the allocation calls in
mempool_alloc.  Fix the second by introducing a __GFP_MEMPOOL flag which
directs the page allocator not to allocate from the reserve pool.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:36 -07:00
Nick Piggin
8e30f272a9 [PATCH] mm: pcp use non powers of 2 for batch size
Jack Steiner reported this to have fixed his problem (bad colouring):
"The patches fix both problems that I found - bad
 coloring & excessive pages in pagesets."

In most workloads this is not likely to be such a pronounced problem,
however it should help corner cases.  And avoiding powers of 2 in these
types of memory operations is always a good idea.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:36 -07:00
Nikita Danilov
81b4082dc7 [PATCH] mm: rmap.c cleanup
mm/rmap.c:page_referenced_one() and mm/rmap.c:try_to_unmap_one() contain
identical code that

 - takes mm->page_table_lock;

 - drills through page tables;

 - checks that correct pte is reached.

Coalesce this into page_check_address()

Signed-off-by: Nikita Danilov <nikita@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:36 -07:00
akpm@osdl.org
119f657c72 [PATCH] RLIMIT_AS checking fix
Address bug #4508: there's potential for wraparound in the various places
where we perform RLIMIT_AS checking.

(I'm a bit worried about acct_stack_growth().  Are we sure that vma->vm_mm is
always equal to current->mm?  If not, then we're comparing some other
process's total_vm with the calling process's rlimits).

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:35 -07:00
akpm@osdl.org
f021e92101 [PATCH] generic_file_buffered_write fixes
Anton Altaparmakov <aia21@cam.ac.uk> points out:

- It calls fault_in_pages_readable() which is completely bogus if @nr_segs >
  1.  It needs to be replaced by a to be written
  "fault_in_pages_readable_iovec()".

- It increments @buf even in the iovec case thus @buf can point to random
  memory really quickly (in the iovec case) and then it calls
  fault_in_pages_readable() on this random memory.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:35 -07:00
akpm@osdl.org
69aa3f7158 [PATCH] ultrastor build fix
Fix a typo.

James Bottomley <James.Bottomley@steeleye.com>

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-01 08:58:35 -07:00
Sam Ravnborg
e8e6993178 [PATCH] kbuild: Set NOSTDINC_FLAGS late to speed up compile (a little)
Move definition of NOSTDINC_FLAGS below inclusion of arch Makefile, so
any arch specific settings to $(CC) takes effect before looking up the
compiler include directory.

The previous solution that replaced ':=' with '=' caused gcc to be
invoked one additional time for each directory visited.

This decreases kernel compile time with 0.1 second (3.6 -> 3.5 seconds) when
running make on a fully built kernel

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-30 16:51:42 -07:00
Sam Ravnborg
b3d9ae4b98 [PATCH] kbuild/ppc: tell when uimage was not built
Tom Rini said:
  Note that there is still a trivial'ish change to make.  When mkimage
  doesn't exist on the host we should say "uImage not made" or
  something similar.

So I did like Tom asked.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-30 16:51:42 -07:00
Sam Ravnborg
2cacb3da62 [PATCH] kbuild/i386: re-introduce dependency on vmlinux for install target, and add kernel_install
Removing the dependency on vmlinux for the install target raised a few
complaints, so instead a new target i added: kernel_install.

kernel_install will install the kernel just like the ordinary install target.
The only difference is that install has a dependency on vmlinux,
kernel_install does not. Therefore kernel_install is the best choice
when accessing the kernel over a NFS mount or as another user.

kernel_install is similar to modules_install in the fact that neither does
a full kernel compile before performing the install.
In this way they are good for root use. Also added back the
dependency on vmlinux for the install target so peoples scripts are no
longer broken.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-30 16:51:42 -07:00
Linus Torvalds
1d651f3332 Merge of master.kernel.org:/home/rmk/linux-2.6-rmk.git 2005-04-30 15:42:33 -07:00
Russell King
4774e2260c [PATCH] ARM: IntegratorCP: Fix CLCD MUX selection values
The documentation on these values seems to be rather wrong.
These values have been determined by mere trial and error.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
2005-04-30 23:32:38 +01:00
Russell King
ed562ab127 [PATCH] ARM: IntegratorCP: 16bpp is RGB565 not RGB555
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
2005-04-30 23:28:47 +01:00
Russell King
1ddb8a16aa [PATCH] ARM: AMBA CLCD: program palette for pseudocolor visuals
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
2005-04-30 22:39:51 +01:00