It turns out that this can break certain existing user land setups.
Quoth Sarah Sharp:
"On Wednesday, I updated my branch to commit 460781b from linus' tree,
and my box would not boot. klogd segfaulted, which stalled the whole
system.
At first I thought it actually hung the box, but it continued booting
after 5 minutes, and I was able to log in. It dropped back to the
text console instead of the graphical bootup display for that period
of time. dmesg surprisingly still works. I've bisected the problem
down to this commit (commit 59365d136d205cc20fe666ca7f89b1c5001b0d5a)
The box is running klogd 1.5.5ubuntu3 (from Jaunty). Yes, I know
that's old. I read the bit in the commit about changing the
permissions of kallsyms after boot, but if I can't boot that doesn't
help."
So let's just keep the old default, and encourage distributions to do
the "chmod -r /proc/kallsyms" in their bootup scripts. This is not
worth a kernel option to change default behavior, since it's so easily
done in user space.
Linus Torvalds [Fri, 19 Nov 2010 18:31:04 +0000 (10:31 -0800)]
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Input: fix typo in keycode validation supporting large scancodes
Input: aiptek - tighten up permissions on sysfs attributes
Input: sysrq - pass along lone Alt + SysRq
Linus Torvalds [Fri, 19 Nov 2010 18:28:13 +0000 (10:28 -0800)]
Merge branch 'drm-intel-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel
* 'drm-intel-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel:
drm/i915: Disable FBC on Ironlake to save 1W
drm/i915: Take advantage of auto-polling CRT hotplug detection on PCH hardware
drm/i915/crt: Introduce struct intel_crt
drm/i915: Do not hold mutex when faulting in user addresses
drm: radeon: fix error value sign
drm/radeon/kms: fix and unify tiled buffer alignment checking for r6xx/7xx
drm/i915: Retire any pending operations on the old scanout when switching
drm/i915: Fix I2C adapter registration
Linus Torvalds [Fri, 19 Nov 2010 18:27:57 +0000 (10:27 -0800)]
Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (40 commits)
drm/radeon/kms: i2c s/sprintf/snprintf/g for safety
drm/radeon/kms: fix i2c pad masks on rs4xx
drm/ttm: Fix up a theoretical deadlock
drm/radeon/kms: fix tiling info on evergreen
drm/radeon/kms: fix alignment when allocating buffers
drm/vmwgfx: Fix up an error path during bo creation
drm/radeon/kms: register an i2c adapter name for the dp aux bus
drm/radeon/kms/atom: add proper external encoders support
drm/radeon/kms/atom: cleanup and unify DVO handling
drm/radeon/kms: properly power up/down the eDP panel as needed (v4)
drm/radeon/kms/atom: set sane defaults in atombios_get_encoder_mode()
drm/radeon/kms: turn the backlight off explicitly for dpms
drm/radeon/kms: fix typo in r600 cs checker
drm: radeon: fix error value sign
drm/radeon/kms: fix and unify tiled buffer alignment checking for r6xx/7xx
nouveau: Acknowledge HPD irq in handler, not bottom half
drm/nouveau: Fix a few confusions between "chipset" and "card_type".
drm/nouveau: don't expose backlight control when available through ACPI
drm/nouveau/pm: improve memtiming mappings
drm/nouveau: Make PCIE GART size depend on the available RAMIN space.
...
Alex Shi [Fri, 19 Nov 2010 09:33:55 +0000 (09:33 +0000)]
drm/i915: Disable FBC on Ironlake to save 1W
Frame buffer compression is broken on Ironlake due to buggy hardware.
Currently it is disabled through chicken bits, but it still consumes
over 1W more than if we simply never attempt to enable the FBC code
paths.
Signed-off-by: Alex Shi <alex.shi@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@kernel.org
Keith Packard [Tue, 16 Nov 2010 08:03:53 +0000 (16:03 +0800)]
drm/i915: Take advantage of auto-polling CRT hotplug detection on PCH hardware
Both IBX and CPT have an automatic hotplug detection mode which appears to work reliably enough
that we can dispense with the manual force hotplug trigger stuff. This means that
hotplug detection is as simple as reading the current hotplug register values.
The first time the hotplug detection is activated, the code synchronously waits for a hotplug
sequence in case the hardware hasn't bothered to do a detection cycle since being initialized.
Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Chris Wilson [Wed, 17 Nov 2010 09:10:42 +0000 (09:10 +0000)]
drm/i915: Do not hold mutex when faulting in user addresses
Linus Torvalds found that it was rather trivial to trigger a system
freeze:
In fact, with lockdep, I don't even need to do the sysrq-d thing: it
shows the bug as it happens. It's the X server taking the same lock
recursively.
Here's the problem:
=============================================
[ INFO: possible recursive locking detected ] 2.6.37-rc2-00012-gbdbd01a #7
---------------------------------------------
Xorg/2816 is trying to acquire lock:
(&dev->struct_mutex){+.+.+.}, at: [<ffffffff812c626c>] i915_gem_fault+0x50/0x17e
but task is already holding lock:
(&dev->struct_mutex){+.+.+.}, at: [<ffffffff812c403b>] i915_mutex_lock_interruptible+0x28/0x4a
other info that might help us debug this:
2 locks held by Xorg/2816:
#0: (&dev->struct_mutex){+.+.+.}, at: [<ffffffff812c403b>] i915_mutex_lock_interruptible+0x28/0x4a
#1: (&mm->mmap_sem){++++++}, at: [<ffffffff81022d4f>] page_fault+0x156/0x37b
This recursion was introduced by rearranging the locking to avoid the
double locking on the fast path (4f27b5d and fbd5a26d) and the
introduction of the prefault to encourage the fast paths (b5e4f2b). In
order to undo the problem, we rearrange the code to perform the access
validation upfront, attempt to prefault and then fight for control of the
mutex. the best case scenario where the mutex is uncontended the
prefaulting is not wasted.
Reported-and-tested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Linus Torvalds [Thu, 18 Nov 2010 23:01:43 +0000 (15:01 -0800)]
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] remove SCSI host lock and serial number usage from ata_scsi_queuecmd
Hans J. Koch [Thu, 18 Nov 2010 20:27:34 +0000 (12:27 -0800)]
Documentation: change email address for Hans Koch
My old mail address doesn't exist anymore. This changes all occurrences
to my new address.
Signed-off-by: Hans J. Koch <hjk@hansjkoch.de> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Bernhard Walle [Thu, 18 Nov 2010 20:27:33 +0000 (12:27 -0800)]
Documentation/gpio.txt: explain poll/select usage
Add a bit more information how to use poll(2) on GPIO value files
correctly. For me it was not clear that I need to poll(2) for
POLLPRI|POLLERR or select(2) for exceptfds.
Signed-off-by: Bernhard Walle <walle@corscience.de> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Dan Carpenter [Thu, 18 Nov 2010 20:27:32 +0000 (12:27 -0800)]
Documentation: make configfs example code simpler, clearer
If "p" is NULL then it will cause an oops when we pass it to
simple_strtoul(). In this case "p" can not be NULL so I removed the
check. I also changed the check a little to make it more explicit that
we are testing whether p points to the NUL char.
Signed-off-by: Dan Carpenter <error27@gmail.com> Acked-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Randy Dunlap [Thu, 18 Nov 2010 20:27:31 +0000 (12:27 -0800)]
kernel-doc: escape xml for structs
scripts/kernel-doc was leaving unescaped '<', '>', and '&' in
generated xml output for structs. This causes xml parser errors.
Convert these characters to "<", ">", and "&" as needed
to prevent errors.
Most of the conversion was already done; complete it just before
output.
Documentation/DocBook/device-drivers.xml:41883: parser error : StartTag: invalid element name
#define INPUT_KEYMAP_BY_INDEX (1 << 0)
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Thu, 18 Nov 2010 18:56:29 +0000 (10:56 -0800)]
hardirq.h: needs sched.h if using BKL
This really isn't the right thing to do, and strictly speaking we should
have the BKL depth count in the thread info right next to the preempt
count. The two really do go together.
However, since that would involve a patch to all architectures, and the
BKL is finally going away, it's simply not worth the effort to do the
RightThing(tm). Just re-instate the <linux/sched.h> include that we
used to get accidentally from the smp_lock.h one.
This is all fallout from the same old "BKL: remove extraneous #include
<smp_lock.h>" commit.
Linus Torvalds [Thu, 18 Nov 2010 16:24:58 +0000 (08:24 -0800)]
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
kgdb,ppc: Fix regression in evr register handling
kgdb,x86: fix regression in detach handling
kdb: fix crash when KDB_BASE_CMD_MAX is exceeded
kdb: fix memory leak in kdb_main.c
Linus Torvalds [Thu, 18 Nov 2010 15:38:58 +0000 (07:38 -0800)]
Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
powerpc: Update a BKL related comment
powerpc/mm: Fix module instruction tlb fault handling on Book-E 64
powerpc: Fix call to subpage_protection()
powerpc: Set CONFIG_32BIT on ppc32
powerpc/mm: Fix build error in setup_initial_memory_limit
powerpc/pseries: Don't override CONFIG_PPC_PSERIES_DEBUG
powerpc: Fix div64 in bootloader
Thomas Hellstrom [Thu, 11 Nov 2010 09:04:53 +0000 (10:04 +0100)]
drm/ttm: Fix up a theoretical deadlock
A process suspended waiting for a higher sequence or no sequence to unreserve,
a bo may be beaten to the reservation by a process with a lower sequence.
In that case the first process should give up trying to reserve and
return -EAGAIN. In order for that to happen, we must wake waiting processes
when we change sequence, so that they have a chance to detect the new
sequence.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Dave Airlie [Thu, 18 Nov 2010 04:57:28 +0000 (14:57 +1000)]
Merge remote branch 'nouveau/for-airlied' of /ssd/git/drm-nouveau-next into drm-fixes
* 'nouveau/for-airlied' of /ssd/git/drm-nouveau-next: (25 commits)
nouveau: Acknowledge HPD irq in handler, not bottom half
drm/nouveau: Fix a few confusions between "chipset" and "card_type".
drm/nouveau: don't expose backlight control when available through ACPI
drm/nouveau/pm: improve memtiming mappings
drm/nouveau: Make PCIE GART size depend on the available RAMIN space.
drm/nouveau: Return error from nouveau_gpuobj_new if we're out of RAMIN.
drm/nouveau: Fix compilation issues in nouveau_pm when CONFIG_HWMON is not set
drm/nouveau: Don't use load detection for connector polling.
drm/nv10-nv20: Fix instability after MPLL changes.
drm/nv50: implement possible workaround for NV86 PGRAPH TLB flush hang
drm/nouveau: Don't poll LVDS outputs.
drm/nouveau: Use "force" to decide if analog load detection is ok or not.
drm/nv04: Fix scanout over the 16MB mark.
drm/nouveau: fix nv40 pcie gart size
drm/nva3: fix overflow in fixed point math used for pll calculation
drm/nv10: Balance RTs expected to be accessed simultaneously by the 3d engine.
drm/nouveau: Expose some BO usage flags to userspace.
drm/nouveau: Reduce severity of the unknown getparam error.
drm/nouveau: Avoid lock dependency between ramht and ramin spinlocks.
drm/nouveau: Some random cleanups.
...
Alex Deucher [Wed, 17 Nov 2010 17:11:03 +0000 (12:11 -0500)]
drm/radeon/kms: fix tiling info on evergreen
We aren't currently using tiling in userspace on evergreen,
but the info we currently return for the tiling info query
(gb_addr_config) is no adequate for userspace tiling alignment
calculations. It does not contain the bank info. Create a custom
tiling info dword with all the necessary info (num channels,
num banks, group size, row size).
Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Alex Deucher [Thu, 18 Nov 2010 00:00:26 +0000 (19:00 -0500)]
drm/radeon/kms: fix alignment when allocating buffers
We were previously dropping alignment requests on the floor
when allocating buffers so we always ended up page aligned.
Certain tiling modes on 6xx+ require larger alignment which
wasn't happening before.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Cc: Jerome Glisse <j.glisse@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Alex Deucher [Wed, 17 Nov 2010 22:56:49 +0000 (17:56 -0500)]
drm/radeon/kms: register an i2c adapter name for the dp aux bus
This causes the connector to not be added since i2c init fails
for the adapter. Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=31688
Noticed by Ari Savolainen.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Cc: Ari Savolainen <ari.m.savolainen@gmail.com> Cc: Jean Delvare <khali@linux-fr.org> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
Alex Deucher [Tue, 16 Nov 2010 17:09:42 +0000 (12:09 -0500)]
drm/radeon/kms/atom: add proper external encoders support
These are external encoder chips connected via DVO or DP.
The actual external encoder programming is handled by the
kms encoder functions for primary encoder.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Alex Deucher [Wed, 17 Nov 2010 07:54:42 +0000 (02:54 -0500)]
drm/radeon/kms: properly power up/down the eDP panel as needed (v4)
The eDP panel must be powered up for aux transactions, so power it
up for detect and mode probe functions, otherwise power it up or
down based on dpms.
v2:
- only mess with eDP panel on DCE4+
- only mess with eDP panel on eDP connectors, not all DP connectors
v3:
- be extra careful to only mess with eDP panels on eDP connectors
v4:
- avoid possible null derefernce if a connector has not been
assigned to the encoder
Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Alex Deucher [Wed, 17 Nov 2010 07:49:40 +0000 (02:49 -0500)]
drm/radeon/kms/atom: set sane defaults in atombios_get_encoder_mode()
If there was no connector mapped to the encoder, atombios_get_encoder_mode()
returned 0 which is the id for DP. Return something sane instead based on
the encoder id. This avoids hitting the DP paths on non-DP encoders.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
Vasiliy Kulikov [Sun, 14 Nov 2010 20:08:27 +0000 (23:08 +0300)]
drm: radeon: fix error value sign
enable_vblank implementations should use negative result to indicate error.
radeon_enable_vblank() returns EINVAL in this case. Change this to -EINVAL.
Signed-off-by: Vasiliy Kulikov <segoon@openwall.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Alex Deucher [Mon, 15 Nov 2010 01:24:35 +0000 (20:24 -0500)]
drm/radeon/kms: fix and unify tiled buffer alignment checking for r6xx/7xx
Tiled buffers have the same alignment requirements regardless of
whether the surface is for db, cb, or textures. Previously, the
calculations where inconsistent for each buffer type.
- Unify the alignment calculations in a common function
- Standardize the alignment units (pixels for pitch/height/depth,
bytes for base)
- properly check the buffer base alignments
Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Francisco Jerez [Mon, 1 Nov 2010 17:08:26 +0000 (18:08 +0100)]
drm/nouveau: Make PCIE GART size depend on the available RAMIN space.
Reported-by: Tomas Miljenovic <tomasmiljenovic@gmail.com> Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Francisco Jerez [Mon, 1 Nov 2010 17:06:28 +0000 (18:06 +0100)]
drm/nouveau: Return error from nouveau_gpuobj_new if we're out of RAMIN.
Reported-by: Tomas Miljenovic <tomasmiljenovic@gmail.com> Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Martin Peres [Tue, 26 Oct 2010 10:48:28 +0000 (12:48 +0200)]
drm/nouveau: Fix compilation issues in nouveau_pm when CONFIG_HWMON is not set
Signed-off-by: Martin Peres <martin.peres@ensi-bourges.fr> Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Lucas Stach [Fri, 15 Oct 2010 20:22:59 +0000 (22:22 +0200)]
drm/nouveau: fix nv40 pcie gart size
Nouveau sets the PCIE GART size to 64MiB for all cards before nv50,
but nv40 has enough RAMIN space to support 512MiB GART size. This
patch fixes this value to make use of this hardware capability.
Signed-off-by: Lucas Stach <dev@lynxeye.de> Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Francisco Jerez [Mon, 11 Oct 2010 01:37:32 +0000 (03:37 +0200)]
drm/nouveau: Avoid lock dependency between ramht and ramin spinlocks.
The ramht code called some gpuobj functions with the HARDIRQ-safe
RAMHT spinlock held, this could potentially lead to a dead lock
because ramin_lock is HARDIRQ-unsafe.
Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Francisco Jerez [Sun, 10 Oct 2010 03:21:59 +0000 (05:21 +0200)]
drm/nv04-nv40: Fall back to panel rescaling if we have no usable native mode.
This allows the user to set a mode larger than the native one, useful
if we had trouble finding the actual native mode (e.g. because it goes
above the hardware bandwidth limits).
Reported-by: Grzesiek Sójka <pld@pfu.pl> Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Jiri Slaby [Tue, 5 Oct 2010 13:07:33 +0000 (15:07 +0200)]
drm/nouveau: ratelimit IRQ messages
There are two messages in the ISR of nouveau which might be printed out
hundred times in a second. Ratelimit them. (We need to move
nouveau_ratelimit to the top of the file.)
Signed-off-by: Jiri Slaby <jslaby@suse.cz> Reviewed-by: Marcin Slusarz <marcin.slusarz@gmail.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
The commit 5e3d20a remove bkl from startup code so setup_arch() it isn't called
with bkl held anymore. Update the comment on top of that function.
Fix also a typo.
This work was supported by a hardware donation from the CE Linux Forum.
Signed-off-by: Alessio Igor Bogani <abogani@texware.it> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This appears to be due to checking the wrong permission bits in the
instruction_tlb_miss handling if the address that faulted was in vmalloc
space. We need to look at the supervisor execute (_PAGE_BAP_SX) bit and
not the user bit (_PAGE_BAP_UX/_PAGE_EXEC).
Also removed a branch level since it did not appear to be used.
Reported-by: Jeffrey Ladouceur <Jeffrey.Ladouceur@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Michael Neuling [Wed, 17 Nov 2010 16:32:59 +0000 (16:32 +0000)]
powerpc: Fix call to subpage_protection()
In:
powerpc/mm: Fix pgtable cache cleanup with CONFIG_PPC_SUBPAGE_PROT
commit d28513bc7f675d28b479db666d572e078ecf182d
Author: David Gibson <david@gibson.dropbear.id.au>
subpage_protection() was changed to to take an mm rather a pgdir but it
didn't change calling site in hashpage_preload(). The change wasn't
noticed at compile time since hashpage_preload() used a void* as the
parameter to subpage_protection().
This is obviously wrong and can trigger the following crash when
CONFIG_SLAB, CONFIG_DEBUG_SLAB, CONFIG_PPC_64K_PAGES
CONFIG_PPC_SUBPAGE_PROT are enabled.
kerstin jonsson [Fri, 22 Oct 2010 00:17:55 +0000 (00:17 +0000)]
powerpc: Set CONFIG_32BIT on ppc32
commit ffe8018c3424892c9590048fc36caa6c3e0c8a76 of the -mm tree
fixes the initramfs size calculation for e.g. s390 but breaks it
for 32bit architectures which do not define CONFIG_32BIT.
This patch fix the problem for PPC32 which will elsewise end up
with a __initramfs_size of 0.
Signed-off-by: Kerstin Jonsson <kerstin.jonsson@ericsson.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Kumar Gala [Wed, 10 Nov 2010 12:29:49 +0000 (12:29 +0000)]
powerpc/mm: Fix build error in setup_initial_memory_limit
arch/powerpc/mm/tlb_nohash.c: In function 'setup_initial_memory_limit':
arch/powerpc/mm/tlb_nohash.c:588:29: error: 'ppc64_memblock_base' undeclared (first use in this function)
arch/powerpc/mm/tlb_nohash.c:588:29: note: each undeclared identifier is reported only once for each function it appears in
Due to a copy/paste typo with the following commit:
EEH and pci_dlpar #undef DEBUG, but I think they were added before the
ability to control this from Kconfig. It's really annoying to only get
some of the debug messages from these files. Leave the lpar.c #undef
alone as it produces so much output as to make the kernel unusable.
Update the Kconfig text to indicate this particular quirk :)
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Acked-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Linus Torvalds [Thu, 18 Nov 2010 02:36:25 +0000 (18:36 -0800)]
hardirq.h: remove now-empty #ifdef/#endif pair
Commit 451a3c24b013 ("BKL: remove extraneous #include <smp_lock.h>")
removed the #include line that was the only thing that was surrounded by
the #ifdef/#endif.
So now that #ifdef is guarding nothing at all. Just remove it.
Reported-by: Byeong-ryeol Kim <brofkims@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Wed, 17 Nov 2010 22:58:36 +0000 (14:58 -0800)]
Fix build failure due to hwirq.h needing smp_lock.h
Arnd Bergmann did an automated scripting run to find left-over instances
of <linux/smp_lock.h>, and had made it trigger it on the normal BKL use
of lock_kernel and unlock_lernel (and apparently release_kernel_lock and
reacquire_kernel_lock too, used by the scheduler).
That resulted in commit 451a3c24b013 ("BKL: remove extraneous #include
<smp_lock.h>").
However, hardirq.h was the only remaining user of the old
'kernel_locked()' interface, and Arnd's script hadn't checked for that.
So depending on your configuration and what header files had been
included, you would get errors like "implicit declaration of function
'kernel_locked'" during the build.
The right fix is not to just re-instate the smp_lock.h include - it is
to just remove 'kernel_locked()' entirely, since the only use was this
one special low-level detail. Just make hardirq.h do it directly.
In fact this simplifies and clarifies the code, because some trivial
analysis makes it clear that hardirq.h only ever used _one_ of the two
definitions of kernel_locked(), so we can remove the other one entirely.
Avi Kivity [Thu, 11 Nov 2010 10:37:26 +0000 (12:37 +0200)]
KVM: VMX: Fix host userspace gsbase corruption
We now use load_gs_index() to load gs safely; unfortunately this also
changes MSR_KERNEL_GS_BASE, which we managed separately. This resulted
in confusion and breakage running 32-bit host userspace on a 64-bit kernel.
Fix by
- saving guest MSR_KERNEL_GS_BASE before we we reload the host's gs
- doing the host save/load unconditionally, instead of only when in guest
long mode
Things can be cleaned up further, but this is the minmal fix for now.
Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Dongdong Deng [Tue, 16 Nov 2010 22:02:00 +0000 (16:02 -0600)]
kgdb,ppc: Fix regression in evr register handling
Commit ff10b88b5a05c8f1646dd15fb9f6093c1384ff6d (kgdb,ppc: Individual
register get/set for ppc) introduced a problem where memcpy was used
incorrectly to read and write the evr registers with a kernel that
has:
CONFIG_FSL_BOOKE=y
CONFIG_SPE=y
CONFIG_KGDB=y
This patch also fixes the following compilation problems:
arch/powerpc/kernel/kgdb.c: In function 'dbg_get_reg':
arch/powerpc/kernel/kgdb.c:341: error: passing argument 2 of 'memcpy' makes pointer from integer without a cast
arch/powerpc/kernel/kgdb.c: In function 'dbg_set_reg':
arch/powerpc/kernel/kgdb.c:366: error: passing argument 1 of 'memcpy' makes pointer from integer without a cast
[jason.wessel@windriver.com: Remove void * casts and fix patch header] Reported-by: Milton Miller <miltonm@bga.com> Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Jason Wessel <jason.wessel@windriver.com> CC: linuxppc-dev@lists.ozlabs.org
The kgdb_remove_all_hw_break() function also needs to call the
hw_break_release_slot() or else a breakpoint can get activated again
after the debugger has detached.
The kgdb test suite exposes the behavior in the form of either a hang
or repetitive failure. The kernel config that exposes the problem
contains all of the following:
Jeff Garzik [Wed, 17 Nov 2010 17:03:58 +0000 (12:03 -0500)]
[libata] remove SCSI host lock and serial number usage from ata_scsi_queuecmd
cmd->serial_number is never tested in any path we reach; therefore we may
remove the call to scsi_cmd_get_serial() inside DEF_SCSI_QCMD, the SCSI
host_lock acquisition surrounding it, and our own SCSI host_lock
unlock+relock cycle.
Arnd Bergmann [Wed, 17 Nov 2010 15:26:56 +0000 (16:26 +0100)]
BKL: remove references to lock_kernel from comments
Lock_kernel is gone from the code, so the comments should be updated,
too. nfsd now uses lock_flocks instead of lock_kernel to protect
against posix file locks.
Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: J. Bruce Fields <bfields@redhat.com> Cc: linux-nfs@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Arnd Bergmann [Wed, 17 Nov 2010 15:26:53 +0000 (16:26 +0100)]
staging/stradis: mark as "depends on BKL"
The stradis driver is on its way out, but it should still be marked
correctly as depending on the big kernel lock. It could easily be
changed to not require it if someone decides to revive the driver and
port it to v4l2 in the process.
Marcus Meissner [Tue, 16 Nov 2010 10:46:03 +0000 (11:46 +0100)]
kernel: make /proc/kallsyms mode 400 to reduce ease of attacking
Making /proc/kallsyms readable only for root by default makes it
slightly harder for attackers to write generic kernel exploits by
removing one source of knowledge where things are in the kernel.
This is the second submit, discussion happened on this on first submit
and mostly concerned that this is just one hole of the sieve ... but
one of the bigger ones.
Changing the permissions of at least System.map and vmlinux is also
required to fix the same set, but a packaging issue.
Target of this starter patch and follow ups is removing any kind of
kernel space address information leak from the kernel.
[ Side note: the default of root-only reading is the "safe" value, and
it's easy enough to then override at any time after boot. The /proc
filesystem allows root to change the permissions with a regular
chmod, so you can "revert" this at run-time by simply doing
chmod og+r /proc/kallsyms
as root if you really want regular users to see the kernel symbols.
It does help some tools like "perf" figure them out without any
setup, so it may well make sense in some situations. - Linus ]
Linus Torvalds [Wed, 17 Nov 2010 02:46:28 +0000 (18:46 -0800)]
Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
nfs: Ignore kmemleak false positive in nfs_readdir_make_qstr
SUNRPC: Simplify rpc_alloc_iostats by removing pointless local variable
nfs: trivial: remove unused nfs_wait_event macro
NFS: readdir shouldn't read beyond the reply returned by the server
NFS: Fix a couple of regressions in readdir.
Revert "NFSv4: Fall back to ordinary lookup if nfs4_atomic_open() returns EISDIR"
Regression: fix mounting NFS when NFSv3 support is not compiled
NLM: Fix a regression in lockd
Linus Torvalds [Tue, 16 Nov 2010 23:20:05 +0000 (15:20 -0800)]
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
sched: Fix cross-sched-class wakeup preemption
sched: Fix runnable condition for stoptask
sched: Use group weight, idle cpu metrics to fix imbalances during idle
Linus Torvalds [Tue, 16 Nov 2010 23:18:17 +0000 (15:18 -0800)]
Merge branch 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6
* 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6:
PM / PM QoS: Fix reversed min and max
PM / OPP: Hide OPP configuration when SoCs do not provide an implementation
PM: Allow devices to be removed during late suspend and early resume
Jeff Garzik [Tue, 16 Nov 2010 07:10:29 +0000 (02:10 -0500)]
SCSI host lock push-down
Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.
The patch below presents a simple SCSI host lock push-down as an
equivalent transformation. No locking or other behavior should change
with this patch. All existing bugs and locking orders are preserved.
Additionally, add one parameter to queuecommand,
struct Scsi_Host *
and remove one parameter from queuecommand,
void (*done)(struct scsi_cmnd *)
Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.
Minimal code disturbance was attempted with this change. Most drivers
needed only two one-line modifications for their host lock push-down.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Acked-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Tue, 16 Nov 2010 17:27:13 +0000 (09:27 -0800)]
Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
[S390] kprobes: Fix the return address of multiple kretprobes
[S390] kprobes: disable interrupts throughout
[S390] ftrace: build without frame pointers on s390
[S390] mm: add devmem_is_allowed() for STRICT_DEVMEM checking
[S390] vmlogrdr: purge after recording is switched off
[S390] cio: fix incorrect ccw_device_init_count
[S390] tape: add medium state notifications
[S390] fix get_user_pages_fast
This code seems to be asking for a shared read/write mapping of 16MB worth of
BAR0 starting at file offset 0, and letting the kernel assign a starting
address. Unfortunately, this -EINVAL causes X not to start. Looking into
dmesg, there's a complaint like so:
process "Xorg" tried to map 0x01000000 bytes at page 0x00000000 on 0000:07:00.0 BAR 0 (start 0x 96000000, size 0x 1000000)
It looks like the logic here is set up such that when the mmap call comes via
sysfs, the check in pci_mmap_fits wants vma->vm_pgoff to be between the
resource's start and end address, and the end of the vma to be no farther than
the end. However, the sysfs PCI resource files always start at offset zero,
which means that this test always fails for programs that mmap the sysfs files.
Given the comment in the original commit 3b519e4ea618b6943a82931630872907f9ac2c2b, I _think_ the old procfs files
require that the file offset be equal to the resource's base address when
mmapping.
I think what we want here is for pci_start to be 0 when mmap_api ==
PCI_MMAP_PROCFS. The following patch makes that change, after which the Matrox
and Mach64 X drivers work again.
Acked-by: Martin Wilck <martin.wilck@ts.fujitsu.com> Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Catalin Marinas [Thu, 11 Nov 2010 12:53:47 +0000 (12:53 +0000)]
nfs: Ignore kmemleak false positive in nfs_readdir_make_qstr
Strings allocated via kmemdup() in nfs_readdir_make_qstr() are
referenced from the nfs_cache_array which is stored in a page cache
page. Kmemleak does not scan such pages and it reports several false
positives. This patch annotates the string->name pointer so that
kmemleak does not consider it a real leak.
Dmitry Torokhov [Mon, 15 Nov 2010 21:33:25 +0000 (13:33 -0800)]
Input: aiptek - tighten up permissions on sysfs attributes
Sysfs attributes affecting device behavior should not be, by default,
world-writeable. If distributions want to allow console users access
these attributes they need to employ udev and friends to adjust
permissions as needed.
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