14 Dec, 2006
40 commits
-
Virtually index, physically tagged cache architectures can get away
without cache flushing when forking. This patch adds a new cache
flushing function flush_cache_dup_mm(struct mm_struct *) which for the
moment I've implemented to do the same thing on all architectures
except on MIPS where it's a no-op.Signed-off-by: Ralf Baechle
Signed-off-by: Linus Torvalds -
Provide a custom copy_user_highpage() to deal with aliasing issues on
MIPS. It uses kmap_coherent() to map an user page for kernel with same
color. Rewrite copy_to_user_page() and copy_from_user_page() with the
new interfaces to avoid extra cache flushing.The main part of this patch was originally written by Ralf Baechle;
Atushi Nemoto did the the debugging.Signed-off-by: Atsushi Nemoto
Signed-off-by: Ralf Baechle
Signed-off-by: Linus Torvalds -
To allow a more effective copy_user_highpage() on certain architectures,
a vma argument is added to the function and cow_user_page() allowing
the implementation of these functions to check for the VM_EXEC bit.The main part of this patch was originally written by Ralf Baechle;
Atushi Nemoto did the the debugging.Signed-off-by: Atsushi Nemoto
Signed-off-by: Ralf Baechle
Signed-off-by: Linus Torvalds -
Problem:
1. There is a process containing two thread (T1 and T2). The
thread T1 calls fork(). Then dup_mmap() function called on T1 context.static inline int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
...
flush_cache_mm(current->mm);
... /* A */
(write-protect all Copy-On-Write pages)
... /* B */
flush_tlb_mm(current->mm);
...2. When preemption happens between A and B (or on SMP kernel), the
thread T2 can run and modify data on COW pages without page fault
(modified data will stay in cache).3. Some time after fork() completed, the thread T2 may cause a page
fault by write-protect on a COW page.4. Then data of the COW page will be copied to newly allocated
physical page (copy_cow_page()). It reads data via kernel mapping.
The kernel mapping can have different 'color' with user space
mapping of the thread T2 (dcache aliasing). Therefore
copy_cow_page() will copy stale data. Then the modified data in
cache will be lost.In order to allow architecture code to deal with this problem allow
architecture code to override copy_user_highpage() by defining
__HAVE_ARCH_COPY_USER_HIGHPAGE in .The main part of this patch was originally written by Ralf Baechle;
Atushi Nemoto did the the debugging.Signed-off-by: Atsushi Nemoto
Signed-off-by: Ralf Baechle
Signed-off-by: Linus Torvalds -
This adds initial support to 8250-pci for the Korenix Jetcard PCI serial
cards. The JC12xx cards are standard RS232-based serial cards utilising
the Oxford 16C950 device.The JC14xx are RS422/RS485-based cards, but in order for these to be
supported natively, we will need additional tweaks to the 8250 layers so
we can specify some values for the 950's registers. Hence, these two
entries are commented out.Signed-off-by: Russell King
Signed-off-by: Linus Torvalds -
* 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block:
[PATCH] Fixup cciss error handling
[PATCH] Allow as-iosched to be unloaded
[PATCH 2/2] cciss: remove calls to pci_disable_device
[PATCH 1/2] cciss: map out more memory for config table
[PATCH] Propagate down request sync flagResolve trivial whitespace conflict in drivers/block/cciss.c manually.
-
* 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6:
hwmon: Add MAINTAINERS entry for new ams driver
hwmon: New AMS hardware monitoring driver
hwmon/w83793: Add documentation and maintainer
hwmon: New Winbond W83793 hardware monitoring driver
hwmon: Update Rudolf Marek's e-mail address
hwmon/f71805f: Fix the device address decoding
hwmon/f71805f: Always create all fan inputs
hwmon/f71805f: Add support for the Fintek F71872F/FG chip
hwmon: New PC87427 hardware monitoring driver
hwmon/it87: Remove the SMBus interface support
hwmon/hdaps: Update the list of supported devices
hwmon/hdaps: Move the DMI detection data to .data
hwmon/pc87360: Autodetect the VRM version
hwmon/f71805f: Document the fan control features
hwmon/f71805f: Add support for "speed mode" fan speed control
hwmon/f71805f: Support DC fan speed control mode
hwmon/f71805f: Let the user adjust the PWM base frequency
hwmon/f71805f: Add manual fan speed control
hwmon/f71805f: Store the fan control registers -
Run this:
#!/bin/sh
for f in $(grep -Erl "\([^\)]*\) *k[cmz]alloc" *) ; do
echo "De-casting $f..."
perl -pi -e "s/ ?= ?\([^\)]*\) *(k[cmz]alloc) *\(/ = \1\(/" $f
doneAnd then go through and reinstate those cases where code is casting pointers
to non-pointers.And then drop a few hunks which conflicted with outstanding work.
Cc: Russell King , Ian Molton
Cc: Mikael Starvik
Cc: Yoshinori Sato
Cc: Roman Zippel
Cc: Geert Uytterhoeven
Cc: Ralf Baechle
Cc: Paul Mackerras
Cc: Kyle McMartin
Cc: Benjamin Herrenschmidt
Cc: Martin Schwidefsky
Cc: "David S. Miller"
Cc: Jeff Dike
Cc: Greg KH
Cc: Jens Axboe
Cc: Paul Fulghum
Cc: Alan Cox
Cc: Karsten Keil
Cc: Mauro Carvalho Chehab
Cc: Jeff Garzik
Cc: James Bottomley
Cc: Ian Kent
Cc: Steven French
Cc: David Woodhouse
Cc: Neil Brown
Cc: Jaroslav Kysela
Cc: Takashi Iwai
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Modify the sstfb (Voodoo1/2) driver:
- fix a memleak when removing the sstfb module
- fix sstfb to use the fbdev default videomode database
- add module option "mode_option" to set initial screen mode
- add sysfs-interface to turn VGA-passthrough on/off via
/sys/class/graphics/fbX/vgapass- remove old debug functions from ioctl interface
Signed-off-by: Helge Deller
Acked-By: James Simmons
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Remove references to non-existent fbmon_valid_timings()
Signed-off-by: Geert Uytterhoeven
Cc: James Simmons
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The undocumented register BIOS uses for saving f_CNT seems to only be
mapped to I/O space while all the other HPT3xx regs are dual-mapped. Looks
like another HighPoint's dirty trick. With this patch, the deadly kernel
oops on the cards having the modern HighPoint BIOSes is now at last gone!Signed-off-by: Sergei Shtylyov
Cc: Bartlomiej Zolnierkiewicz
Cc: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Use the f_CNT value saved by the HighPoint BIOS if available as reading it
directly would give us a wrong PCI frequency after DPLL has already been
calibrated by BIOS.Signed-off-by: Sergei Shtylyov
Cc: Bartlomiej Zolnierkiewicz
Cc: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
init_chipset_hpt366() modifies some fields of the ide_pci_device_t structure
depending on the chip's revision, so pass it a copy of the structure to avoid
issues when multiple different chips are present.Signed-off-by: Sergei Shtylyov
Cc: Bartlomiej Zolnierkiewicz
Cc: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix the broken hotswap code: on HPT37x it caused RESET- to glitch when
tristating the bus (the MISC control 3/6 and soft control 2 need to be written
to in the certain order), and for HPT36x the obsolete HDIO_TRISTATE_HWIF
ioctl() handler was called instead which treated the state argument wrong.
Also, get rid of the soft control reg. 1 wtite to enable IDE interrupt --
this is done in init_hpt37x() already...Have been tested on HPT370 and 371N.
Signed-off-by: Sergei Shtylyov
Cc: Bartlomiej Zolnierkiewicz
Cc: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Save some space on the timing tables by introducing the separate transfer mode
table in which the mode lookup is done to get the index into the timing table
itself. Get rid of the rest of the obsolete/duplicate tables and use one set
of tables for the whole HPT37x chip family like the HighPoint open-source
drivers do. Documnent the different timing register layout for the HPT36x
chip family (this is my guesswork based on the timing values).Have been tested and works fine on HPT370/302/371N.
Signed-off-by: Sergei Shtylyov
Cc: Bartlomiej Zolnierkiewicz
Cc: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix/remove bad/unused timing tables: HPT370/A 66 MHz tables weren't really
needed (the chips are not UltraATA/133 capable and shouldn't support 66 MHz
PCI) and had many modes over- and underclocked, HPT372 33 MHz table was in
fact for 66 MHz and 50 MHz table missed UltraDMA mode 6, HPT374 33 MHz table
was really for 50 MHz... (Actually, HPT370/A 33 MHz tables also have issues.
e.g. HPT370 has PIO modes 0/1 overlocked.)There's also no need in the separate HPT374 tables because HPT372 timings
should be the same (and those tables has UltraDMA mode 6 which HPT374 supports
depending on HPT374_ALLOW_ATA133_6 #define)...Signed-off-by: Sergei Shtylyov
Cc: Bartlomiej Zolnierkiewicz
Cc: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix serious problems with the HPT372N clock turnaround code:
- the wrong ports were written to when called for the secondary channel;
- it didn't serialize access to the channels;
- turnaround shou;dn't be done on 66 MHz PCI;
- caching the clock mode per-channel caused it to get out of sync with the
actual register value.Additionally, avoid calibrating PLL twice (for each channel) as the second try
results in a wrong PCI frequency and thus in the wrong timings.Make the driver deal with HPT302N and HPT371N correctly -- the clocking and
(seemingly) a need for clock tunaround is the same as for HPT372N. HPT371/N
chips have only one, secondary channel, so avoid touching their "pure virtual"
primary channel, and disable it if the BIOS haven't done this already.Also, while at it, disable UltraATA/133 for HPT372 by default -- 50 MHz DPLL
clock don't allow for this speed anyway. And remove the traces of the former
bad patch that wasn't even applicable to this version of driver.Has been tested on HPT370/371N, unfortunately I don't have an instant access
to the other chips...Signed-off-by: Sergei Shtylyov
Cc: Bartlomiej Zolnierkiewicz
Cc: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
calc_load() is called by timer interrupt to update avenrun[]. It currently
calls nr_active() at each timer tick (HZ per second), while the update of
avenrun[] is done only once every 5 seconds. (LOAD_FREQ=5 Hz)nr_active() is quite expensive on SMP machines, since it has to sum up
nr_running and nr_uninterruptible of all online CPUS, bringing foreign
dirty cache lines.This patch is an optimization of calc_load() so that nr_active() is called
only if we need it.The use of unlikely() is welcome since the condition is true only once every
5*HZ time.Signed-off-by: Eric Dumazet
Cc: Ingo Molnar
Acked-by: "Siddha, Suresh B"
Cc: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The nfsservctl system call isn't used but recent nfs-utils releases for
exporting filesystems, and consequently the code that is uses - exp_export -
has suffered some bitrot.Particular:
- some newly added fields in 'struct svc_export' are being initialised
properly.
- the return value is now always -ENOMEM ...This patch fixes both these problems.
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Kill another big "if" clause.
Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
I'm not too fond of these big if conditions. Replace them by checks of a flag
in the operation descriptor. To my eye this makes the code a bit more
self-documenting, and makes the complicated part of the code (proc_compound) a
little more compact.Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Define an op descriptor struct, use it to simplify nfsd4_proc_compound().
Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Make wrappers for verify and nverify, for consistency with other ops.
Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The inlining contributes to bloating the stack of nfsd4_compound, and I want
to change the compound op functions to function pointers anyway.Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Tuck away the replay_owner in the cstate while we're at it.
Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
OK, this is embarassing--I've even looked back at the history, and cannot for
the life of me figure out why I added this check.Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Pass the saved and current filehandles together into all the nfsd4 compound
operations.I want a unified interface to these operations so we can just call them by
pointer and throw out the huge switch statement.Also I'll eventually want a structure like this--that holds the state used
during compound processing--for deferral.Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There's no point deferring something just to immediately fail the deferral,
especially now that we can do something more useful in the failure case by
returning an error.Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
To avoid tying up server threads when nfsd makes an upcall (to mountd, to get
export options, to idmapd, for nfsv4 nameid mapping, etc.), we temporarily
"drop" the request and save enough information so that we can revisit it
later.Certain failures during the deferral process can cause us to really drop the
request and never revisit it.This is often less than ideal, and is unacceptable in the NFSv4 case--rfc 3530
forbids the server from dropping a request without also closing the
connection.As a first step, we modify the deferral code to return -ETIMEDOUT (which is
translated to nfserr_jukebox in the v3 and v4 cases, and remains a drop in the
v2 case).Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch on its own causes no change in behavior, since nfsd_cross_mnt()
only returns -EAGAIN; but in the future I'd like it to also be able to return
-ETIMEDOUT, so we may as well handle any possible error here.Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Note there's no need for special handling of -EAGAIN here; nfserrno() does
what we want already. So this is a pure cleanup with no change in
functionality.Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Since exp_parent can fail by returning an error (-EAGAIN) in addition to by
returning NULL, we should check for that case in exp_rootfh.(TODO: we should check that userland handles these errors too.)
Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
A comment here incorrectly states that "slack_space" is measured in words, not
bytes. Remove the comment, and adjust a variable name and a few comments to
clarify the situation.This is pure cleanup; there should be no change in functionality.
Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The memory leak here is embarassingly obvious.
This fixes a problem that causes the kernel to leak a small amount of memory
every time it receives a integrity-protected request.Thanks to Aim Le Rouzic for the bug report.
Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This dprintk is printing the wrong error now, but it's probably an unnecessary
dprintk anyway; just remove it.Signed-off-by: J. Bruce Fields
Signed-off-by: Neil Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The BLK_DEV_SWIM_IOP driver has:
- already been marked as BROKEN in 2.6.0 three years ago and
- is still marked as BROKEN.Drivers that had been marked as BROKEN for such a long time seem to be
unlikely to be revived in the forseeable future.But if anyone wants to ever revive this driver, the code is still
present in the older kernel releases.Signed-off-by: Adrian Bunk
Cc: Jens Axboe
Acked-by: Geert Uytterhoeven
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
As Adrian pointed out recently, there were still a couple of places where
I should have fixed my email address.Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This took a little refactoring but now errors are handled cleanly. When
this code used pid_t values this wasn't necessary because you can't
leak a pid_t.Thanks to Peter Vandrovec for spotting this.
Signed-off-by: Eric W. Biederman
Cc: Peter Vandrovec
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
